ppm_fillers.c

// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*

Copyright (C) 2023 The Falco Authors.

This file is dual licensed under either the MIT or GPL 2. See MIT.txt
or GPL2.txt for full copies of the license.

*/
#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/compat.h>
#include <linux/cdev.h>
#include <asm/unistd.h>
#include <net/sock.h>
#include <net/af_unix.h>
#include <net/compat.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/fdtable.h>
#include <linux/file.h>
#include <linux/fs_struct.h>
#include <linux/pid_namespace.h>
#include <linux/ptrace.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/quota.h>
#include <linux/tty.h>
#include <linux/uaccess.h>
#include <linux/audit.h>
#ifdef CONFIG_CGROUPS
#include <linux/cgroup.h>
#endif
#include <asm/syscall.h>
#include "ppm_ringbuffer.h"
#include "ppm_events_public.h"
#include "ppm_events.h"
#include "ppm.h"
#include "ppm_flag_helpers.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
#include <linux/bpf.h>
#endif
#include "kernel_hacks.h"
#include "systype_compat.h"

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
struct ovl_entry {
	struct dentry *__upperdentry;
	struct ovl_dir_cache *cache;
	union {
		struct {
			uint64_t version;
			const char *redirect;
			bool opaque;
			bool impure;
			bool copying;
		};
		struct rcu_head rcu;
	};
	unsigned numlower;
	struct path lowerstack[];
};
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0)
struct ovl_entry {
	union {
		struct {
			unsigned long has_upper;
			bool opaque;
		};
		struct rcu_head rcu;
	};
	unsigned numlower;
	struct path lowerstack[];
};
#else
struct ovl_entry {
	union {
		struct {
			unsigned long flags;
		};
		struct rcu_head rcu;
	};
	unsigned numlower;
	//struct ovl_path lowerstack[];
};

enum ovl_entry_flag {
	OVL_E_UPPER_ALIAS,
	OVL_E_OPAQUE,
	OVL_E_CONNECTED,
};
#endif

#define merge_64(hi, lo) ((((unsigned long long)(hi)) << 32) + ((lo) & 0xffffffffUL))

static inline struct pid_namespace *pid_ns_for_children(struct task_struct *task)
{
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0))
	return task->nsproxy->pid_ns;
#else
	return task->nsproxy->pid_ns_for_children;
#endif
}

/*
 * Detect whether the file being referenced is an anonymous file created using memfd_create()
 * and is being executed by referencing its file descriptor (fd). This type of file does not
 * exist on disk and resides solely in memory, but it is treated as a legitimate file with an
 * inode object and other file attributes.
 *
 **/
static inline uint32_t get_exe_from_memfd(const struct file *exe_file)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
	const char expected_prefix[] = "memfd:";
	if(!(exe_file &&
		 exe_file->f_path.dentry &&
		 exe_file->f_path.dentry == exe_file->f_path.dentry->d_parent))
	{
		return 0;
	}

    if(strncmp(exe_file->f_path.dentry->d_name.name, expected_prefix, sizeof(expected_prefix) - 1) == 0)
    {
        return PPM_EXE_FROM_MEMFD;

    }
#endif
	return 0;
}


int f_sys_generic(struct event_filler_arguments *args)
{
	int res;
	long table_index = args->syscall_id - SYSCALL_TABLE_ID0;

	/*
	 * name
	 */

	if (likely(table_index >= 0 &&
		   table_index <  SYSCALL_TABLE_SIZE)) {
		ppm_sc_code sc_code = g_syscall_table[table_index].ppm_sc;

		/*
		 * ID
		 */
		res = val_to_ring(args, sc_code, 0, false, 0);
		CHECK_RES(res);

		if (args->event_type == PPME_GENERIC_E) {
			/*
			 * nativeID
			 */
			res = val_to_ring(args, args->syscall_id, 0, false, 0);
			CHECK_RES(res);
		}
	} else {
		ASSERT(false);
		res = val_to_ring(args, (uint64_t)"<out of bound>", 0, false, 0);
		CHECK_RES(res);
	}

	return add_sentinel(args);
}

int f_sys_empty(struct event_filler_arguments *args)
{
	return add_sentinel(args);
}

int f_sys_single(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_single_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;

	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fstat_e(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

static inline void get_fd_dev_ino(int64_t fd, uint32_t* dev, uint64_t* ino)
{
	struct files_struct *files;
	struct fdtable *fdt;
	struct file *file;
	struct inode *inode;
	struct super_block *sb;

	if (fd < 0)
		return;

	files = current->files;
	if (unlikely(!files))
		return;

	spin_lock(&files->file_lock);
	fdt = files_fdtable(files);
	if (unlikely(fd > fdt->max_fds))
		goto out_unlock;

	file = fdt->fd[fd];
	if (unlikely(!file))
		goto out_unlock;

	inode = file_inode(file);
	if (unlikely(!inode))
		goto out_unlock;

	*ino = inode->i_ino;

	sb = inode->i_sb;
	if (unlikely(!sb))
		goto out_unlock;

	*dev = new_encode_dev(sb->s_dev);

out_unlock:
	spin_unlock(&files->file_lock);
	return;
}

static inline void get_fd_fmode_created(int64_t fd, unsigned long* flags)
{
/* FMODE_CREATED flag was introduced in kernel 4.19 and it's not present in earlier versions */
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 19, 0)
	struct files_struct *files;
	struct fdtable *fdt;
	struct file *file;

	if (fd < 0)
		return;

	files = current->files;
	if (unlikely(!files))
		return;

	spin_lock(&files->file_lock);
	fdt = files_fdtable(files);
	if (unlikely(fd > fdt->max_fds))
		goto out_unlock;

	file = fdt->fd[fd];
	if (unlikely(!file))
		goto out_unlock;

	if (file->f_mode & FMODE_CREATED)
		*flags |= PPM_O_F_CREATED;

out_unlock:
	spin_unlock(&files->file_lock);
#endif
	return;
}

int f_sys_open_e(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long flags;
	unsigned long modes;
	char *name = NULL;
	int res;

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	if(likely(ppm_strncpy_from_user(args->str_storage, (const void __user *)val, PPM_MAX_PATH_SIZE) >= 0))
	{
		name = args->str_storage;
		name[PPM_MAX_PATH_SIZE - 1] = '\0';
	}
	res = val_to_ring(args, (int64_t)(long)name, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Flags
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &flags);
	res = val_to_ring(args, open_flags_to_scap(flags), 0, false, 0);
	CHECK_RES(res);

	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(flags, modes), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_open_x(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long flags;
	unsigned long scap_flags;
	unsigned long modes;
	uint32_t dev = 0;
	uint64_t ino = 0;
	int res;
	int64_t retval;

	/*
	 * fd
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);


	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * Flags
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &flags);
	scap_flags = open_flags_to_scap(flags);	
	/* update scap flags if file is created */
	get_fd_fmode_created(retval, &scap_flags);
	res = val_to_ring(args, scap_flags, 0, false, 0);
	CHECK_RES(res);

	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(flags, modes), 0, false, 0);
	CHECK_RES(res);

	get_fd_dev_ino(retval, &dev, &ino);

	/*
	 *  dev
	 */
	res = val_to_ring(args, dev, 0, false, 0);
	CHECK_RES(res);

	/*
	 *  ino
	 */
	res = val_to_ring(args, ino, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_read_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: size (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_read_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	unsigned long bufsize;

	/*
	 * Retrieve the FD. It will be used for dynamic snaplen calculation.
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	args->fd = (int)val;

	/*
	 * res
	 */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * data
	 */
	if (retval < 0) {
		/*
		 * The operation failed, return an empty buffer
		 */
		val = 0;
		bufsize = 0;
	} else {
		syscall_get_arguments_deprecated(args, 1, 1, &val);

		/*
		 * The return value can be lower than the value provided by the user,
		 * and we take that into account.
		 */
		bufsize = retval;
	}

	/*
	 * Copy the buffer
	 */
	args->enforce_snaplen = true;
	res = val_to_ring(args, val, bufsize, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_write_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: size (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_write_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	unsigned long bufsize;

	/*
	 * Retrieve the FD. It will be used for dynamic snaplen calculation.
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	args->fd = (int)val;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: data (type: PT_BYTEBUF) */
	/* Get the size from userspace paramater */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	bufsize = retval > 0 ? retval : val;

	syscall_get_arguments_deprecated(args, 1, 1, &val);
	args->enforce_snaplen = true;
	res = val_to_ring(args, val, bufsize, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

/*
 * get_mm_exe_file is only exported in some kernel versions
 */
struct file *ppm_get_mm_exe_file(struct mm_struct *mm)
{
	struct file *exe_file;

	/*
	 * The following if/else preprocessor directive is to cover for that change:
	 * https://github.com/torvalds/linux/commit/90f31d0ea88880f780574f3d0bb1a227c4c66ca3#diff-e37b5cb4c23f6ab27741c60ec48674eff0268624a228c9a1cddddb9e4ee2922dL709
	 * That was introduced in linux 4.1, but it's backported in some distro kernels.
	 * Luckily enough, `get_file_rcu` is a define, so we can check for it and use
	 * the safer version.
	 */
#if defined(get_file_rcu)
	rcu_read_lock();
	exe_file = rcu_dereference(mm->exe_file);
	if (exe_file && !get_file_rcu(exe_file))
		exe_file = NULL;
	rcu_read_unlock();
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(6, 7, 0)
	// Since linux 6.7.0, `get_file_rcu` is no more a define and takes a double pointer parameter.
	// See https://github.com/torvalds/linux/commit/0ede61d8589cc2d93aa78230d74ac58b5b8d0244.
	rcu_read_lock();
	exe_file = get_file_rcu(&mm->exe_file);
	rcu_read_unlock();
#else
	/* We need mmap_sem to protect against races with removal of
	 * VM_EXECUTABLE vmas */
	down_read(&mm->mmap_sem);
	exe_file = mm->exe_file;
	if (exe_file)
		get_file(exe_file);
	up_read(&mm->mmap_sem);
#endif

	return exe_file;
}

/*
 * get_mm_counter was not inline and exported between 3.0 and 3.4
 * https://github.com/torvalds/linux/commit/69c978232aaa99476f9bd002c2a29a84fa3779b5
 * Hence the crap in these two functions
 */
unsigned long ppm_get_mm_counter(struct mm_struct *mm, int member)
{
	long val = 0;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
	val = get_mm_counter(mm, member);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
	val = atomic_long_read(&mm->rss_stat.count[member]);

	if (val < 0)
		val = 0;
#endif

	return val;
}

static unsigned long ppm_get_mm_swap(struct mm_struct *mm)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
	return ppm_get_mm_counter(mm, MM_SWAPENTS);
#endif
	return 0;
}

static unsigned long ppm_get_mm_rss(struct mm_struct *mm)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
	return get_mm_rss(mm);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
	return ppm_get_mm_counter(mm, MM_FILEPAGES) +
		ppm_get_mm_counter(mm, MM_ANONPAGES);
#else
	return get_mm_rss(mm);
#endif
	return 0;
}

#ifdef CONFIG_CGROUPS
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34)
static int ppm_cgroup_path(const struct cgroup *cgrp, char *buf, int buflen)
{
	char *start;
	struct dentry *dentry = rcu_dereference(cgrp->dentry);

	if (!dentry) {
		/*
		 * Inactive subsystems have no dentry for their root
		 * cgroup
		 */
		strcpy(buf, "/");
		return 0;
	}

	start = buf + buflen;

	*--start = '\0';
	for (;;) {
		int len = dentry->d_name.len;

		start -= len;
		if (start < buf)
			return -ENAMETOOLONG;
		memcpy(start, cgrp->dentry->d_name.name, len);
		cgrp = cgrp->parent;
		if (!cgrp)
			break;
		dentry = rcu_dereference(cgrp->dentry);
		if (!cgrp->parent)
			continue;
		if (--start < buf)
			return -ENAMETOOLONG;
		*start = '/';
	}
	memmove(buf, start, buf + buflen - start);
	return 0;
}
#endif

static int append_cgroup(const char *subsys_name, int subsys_id, char *buf, int *available)
{
	int pathlen;
	int subsys_len;
	char *path;

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0) || LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
	int res;
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0)
	struct cgroup_subsys_state *css = task_css(current, subsys_id);
#else
	struct cgroup_subsys_state *css = task_subsys_state(current, subsys_id);
#endif

	if (!css) {
		ASSERT(false);
		return 1;
	}

	if (!css->cgroup) {
		ASSERT(false);
		return 1;
	}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
	// According to https://github.com/torvalds/linux/commit/4c737b41de7f4eef2a593803bad1b918dd718b10
	// cgroup_path now returns an int again
	res = cgroup_path(css->cgroup, buf, *available);
	if (res < 0) {
		ASSERT(false);
		path = "NA";
	} else {
		path = buf;
	}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
	path = cgroup_path(css->cgroup, buf, *available);
	if (!path) {
		ASSERT(false);
		path = "NA";
	}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
	res = cgroup_path(css->cgroup, buf, *available);
	if (res < 0) {
		ASSERT(false);
		path = "NA";
	} else {
		path = buf;
	}
#else
	res = ppm_cgroup_path(css->cgroup, buf, *available);
	if (res < 0) {
		ASSERT(false);
		path = "NA";
	} else {
		path = buf;
	}
#endif

	pathlen = strlen(path);
	subsys_len = strlen(subsys_name);
	if (subsys_len + 1 + pathlen + 1 > *available)
		return 1;

	memmove(buf + subsys_len + 1, path, pathlen);
	memcpy(buf, subsys_name, subsys_len);
	buf += subsys_len;
	*buf++ = '=';
	buf += pathlen;
	*buf++ = 0;
	*available -= (subsys_len + 1 + pathlen + 1);
	return 0;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
#define SUBSYS(_x)																						\
if (append_cgroup(#_x, _x ## _cgrp_id, args->str_storage + STR_STORAGE_SIZE - available, &available))	\
	goto cgroups_error;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
#define IS_SUBSYS_ENABLED(option) IS_BUILTIN(option)
#define SUBSYS(_x)																						\
if (append_cgroup(#_x, _x ## _subsys_id, args->str_storage + STR_STORAGE_SIZE - available, &available)) \
	goto cgroups_error;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0)
#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
#define SUBSYS(_x)																						\
if (append_cgroup(#_x, _x ## _subsys_id, args->str_storage + STR_STORAGE_SIZE - available, &available)) \
	goto cgroups_error;
#else
#define SUBSYS(_x)																						\
if (append_cgroup(#_x, _x ## _subsys_id, args->str_storage + STR_STORAGE_SIZE - available, &available)) \
	goto cgroups_error;
#endif

#endif

/* Takes in a NULL-terminated array of pointers to strings in userspace, and
 * concatenates them to a single \0-separated string. Return the length of this
 * string, or <0 on error */
int accumulate_argv_or_env(const char __user * __user *argv,
				  char *str_storage,
				  int available)
{
	int len = 0;
	int n_bytes_copied;

	if (argv == NULL)
		return len;

	for (;;) {
		const char __user *p;

		if (unlikely(ppm_get_user(p, argv)))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		if (p == NULL)
			break;

		/* need at least enough space for a \0 */
		if (available < 1)
			return PPM_FAILURE_BUFFER_FULL;

		n_bytes_copied = ppm_strncpy_from_user(&str_storage[len], p,
						       available);

		/* ppm_strncpy_from_user includes the trailing \0 in its return
		 * count. I want to pretend it was strncpy_from_user() so I
		 * subtract off the 1 */
		n_bytes_copied--;

		if (n_bytes_copied < 0)
			return PPM_FAILURE_INVALID_USER_MEMORY;

		if (n_bytes_copied >= available)
			return PPM_FAILURE_BUFFER_FULL;

		/* update buffer. I want to keep the trailing \0, so I +1 */
		available   -= n_bytes_copied+1;
		len         += n_bytes_copied+1;

		argv++;
	}

	return len;
}

#ifdef CONFIG_COMPAT
/* compat version that deals correctly with 32bits pointers of argv */
static int compat_accumulate_argv_or_env(compat_uptr_t argv,
				  char *str_storage,
				  int available)
{
	int len = 0;
	int n_bytes_copied;

	if (compat_ptr(argv) == NULL)
		return len;

	for (;;) {
		compat_uptr_t compat_p;
		const char __user *p;

		if (unlikely(ppm_get_user(compat_p, compat_ptr(argv))))
			return PPM_FAILURE_INVALID_USER_MEMORY;
		p = compat_ptr(compat_p);

		if (p == NULL)
			break;

		/* need at least enough space for a \0 */
		if (available < 1)
			return PPM_FAILURE_BUFFER_FULL;

		n_bytes_copied = ppm_strncpy_from_user(&str_storage[len], p,
						       available);

		/* ppm_strncpy_from_user includes the trailing \0 in its return
		 * count. I want to pretend it was strncpy_from_user() so I
		 * subtract off the 1 */
		n_bytes_copied--;

		if (n_bytes_copied < 0) {
			return PPM_FAILURE_INVALID_USER_MEMORY;
		}
		if (n_bytes_copied >= available)
			return PPM_FAILURE_BUFFER_FULL;

		/* update buffer. I want to keep the trailing \0, so I +1 */
		available   -= n_bytes_copied+1;
		len         += n_bytes_copied+1;

		argv += sizeof(compat_uptr_t);
	}

	return len;
}

#endif

static uint32_t ppm_get_tty(void)
{
	/* Locking of the signal structures seems too complicated across
	 * multiple kernel versions to get it right, so simply do protected
	 * memory accesses, and in the worst case we get some garbage,
	 * which is not the end of the world. In the vast majority of accesses,
	 * we'll be just fine.
	 */
	struct signal_struct *sig;
	struct tty_struct *tty;
	struct tty_driver *driver;
	int major;
	int minor_start;
	int index;
	uint32_t tty_nr = 0;

	sig = current->signal;
	if (!sig)
		return 0;

	if (unlikely(copy_from_kernel_nofault(&tty, &sig->tty, sizeof(tty))))
		return 0;

	if (!tty)
		return 0;

	if (unlikely(copy_from_kernel_nofault(&index, &tty->index, sizeof(index))))
		return 0;

	if (unlikely(copy_from_kernel_nofault(&driver, &tty->driver, sizeof(driver))))
		return 0;

	if (!driver)
		return 0;

	if (unlikely(copy_from_kernel_nofault(&major, &driver->major, sizeof(major))))
		return 0;

	if (unlikely(copy_from_kernel_nofault(&minor_start, &driver->minor_start, sizeof(minor_start))))
		return 0;

	tty_nr = new_encode_dev(MKDEV(major, minor_start) + index);

	return tty_nr;
}

bool ppm_is_upper_layer(struct file *exe_file){
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
	struct super_block *sb = NULL;
	unsigned long sb_magic = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
	sb = exe_file->f_path.dentry->d_sb;
#else
	sb = exe_file->f_inode->i_sb;
#endif
	if(sb)
	{
		struct ovl_entry *oe = (struct ovl_entry*)(exe_file->f_path.dentry->d_fsdata);
		sb_magic = sb->s_magic;
		if(sb_magic == PPM_OVERLAYFS_SUPER_MAGIC && oe)
		{
			unsigned long has_upper = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
			if(oe->__upperdentry)
			{
				return true;
			}
#else
			struct dentry *upper_dentry = NULL;
			unsigned int d_flags = exe_file->f_path.dentry->d_flags;
			bool disconnected = (d_flags & DCACHE_DISCONNECTED);

			// Pointer arithmetics due to unexported ovl_inode struct
			// warning: this works if and only if the dentry pointer
			// is placed right after the inode struct
			upper_dentry = (struct dentry *)((char *)exe_file->f_path.dentry->d_inode + sizeof(struct inode));

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0)
			has_upper = oe->has_upper;
#elif LINUX_VERSION_CODE < KERNEL_VERSION(6, 5, 0)
			has_upper = test_bit(OVL_E_UPPER_ALIAS, &(oe->flags));
#else
			has_upper = test_bit(OVL_E_UPPER_ALIAS, (unsigned long*)&oe);
#endif

			if(upper_dentry && (has_upper || disconnected))
			{
				return true;
			}
#endif
		}
	}
#endif
	return false;
}

int f_proc_startupdate(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	unsigned int exe_len = 0;  /* the length of the executable string */
	int args_len = 0; /*the combined length of the arguments string + executable string */
	struct mm_struct *mm = current->mm;
	int64_t retval;
	int ptid;
	long total_vm = 0;
	long total_rss = 0;
	long swap = 0;
	int available = STR_STORAGE_SIZE;
	const struct cred *cred;
	uint64_t pidns_init_start_time = 0;

#ifdef __NR_clone3
	struct clone_args cl_args;
#endif

	/*
	 * Make sure the operation was successful
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	if (unlikely(retval < 0 &&
		     args->event_type != PPME_SYSCALL_EXECVE_19_X &&
			 args->event_type != PPME_SYSCALL_EXECVEAT_X)) {

		/* The call failed, but this syscall has no exe, args
		 * anyway, so I report empty ones */
		*args->str_storage = 0;

		/*
		 * exe
		 */
		res = val_to_ring(args, (uint64_t)(long)args->str_storage, 0, false, 0);
		CHECK_RES(res);

		/*
		 * Args
		 */
		res = val_to_ring(args, (int64_t)(long)args->str_storage, 0, false, 0);
		CHECK_RES(res);
	} else {

		if (likely(retval >= 0)) {
			/*
			 * The call succeeded. Get exe, args from the current
			 * process; put one \0-separated exe-args string into
			 * str_storage
			 */

			if (unlikely(!mm)) {
				args->str_storage[0] = 0;
				pr_info("f_proc_startupdate drop, mm=NULL\n");
				return PPM_FAILURE_BUG;
			}

			if (unlikely(!mm->arg_end)) {
				args->str_storage[0] = 0;
				pr_info("f_proc_startupdate drop, mm->arg_end=NULL\n");
				return PPM_FAILURE_BUG;
			}

			args_len = mm->arg_end - mm->arg_start;

			if (args_len) {
				if (args_len > PAGE_SIZE)
					args_len = PAGE_SIZE;

				if (unlikely(ppm_copy_from_user(args->str_storage, (const void __user *)mm->arg_start, args_len)))
					args_len = 0;
				else
					args->str_storage[args_len - 1] = 0;
			}
		} else {

			/*
			 * The execve or execveat call failed. I get exe, args from the
			 * input args; put one \0-separated exe-args string into
			 * str_storage
			 */
			args->str_storage[0] = 0;

			switch (args->event_type)
			{
			case PPME_SYSCALL_EXECVE_19_X:
				syscall_get_arguments_deprecated(args, 1, 1, &val);
				break;
			
			case PPME_SYSCALL_EXECVEAT_X:
				syscall_get_arguments_deprecated(args, 2, 1, &val);
				break;

			default:
				val = 0;
				break;
			}
#ifdef CONFIG_COMPAT
			if (unlikely(args->compat))
				args_len = compat_accumulate_argv_or_env((compat_uptr_t)val,
							   args->str_storage, available);
			else
#endif
				args_len = accumulate_argv_or_env((const char __user * __user *)val,
							   args->str_storage, available);

			if (unlikely(args_len < 0))
				args_len = 0;
		}

		if (args_len == 0)
			*args->str_storage = 0;

		exe_len = strnlen(args->str_storage, args_len);
		if (exe_len < args_len)
			++exe_len;

		/*
		 * exe
		 */
		res = val_to_ring(args, (uint64_t)(long)args->str_storage, 0, false, 0);
		CHECK_RES(res);

		/*
		 * Args
		 */
		res = val_to_ring(args, (int64_t)(long)args->str_storage + exe_len, args_len - exe_len, false, 0);
		CHECK_RES(res);
	}


	/*
	 * tid
	 */
	res = val_to_ring(args, (int64_t)current->pid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pid
	 */
	res = val_to_ring(args, (int64_t)current->tgid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * ptid
	 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
	if (current->real_parent)
		ptid = current->real_parent->pid;
#else
	if (current->parent)
		ptid = current->parent->pid;
#endif
	else
		ptid = 0;

	res = val_to_ring(args, (int64_t)ptid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * cwd, pushed empty to avoid breaking compatibility
	 * with the older event format
	 */
	res = push_empty_param(args);
	CHECK_RES(res);

	/*
	 * fdlimit
	 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
	res = val_to_ring(args, (int64_t)rlimit(RLIMIT_NOFILE), 0, false, 0);
#else
	res = val_to_ring(args, (int64_t)0, 0, false, 0);
#endif
	CHECK_RES(res);

	/*
	 * pgft_maj
	 */
	res = val_to_ring(args, current->maj_flt, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pgft_min
	 */
	res = val_to_ring(args, current->min_flt, 0, false, 0);
	CHECK_RES(res);

	if (mm) {
		total_vm = mm->total_vm << (PAGE_SHIFT-10);
		total_rss = ppm_get_mm_rss(mm) << (PAGE_SHIFT-10);
		swap = ppm_get_mm_swap(mm) << (PAGE_SHIFT-10);
	}

	/*
	 * vm_size
	 */
	res = val_to_ring(args, total_vm, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_rss
	 */
	res = val_to_ring(args, total_rss, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_swap
	 */
	res = val_to_ring(args, swap, 0, false, 0);
	CHECK_RES(res);

	/*
	 * comm
	 */
	res = val_to_ring(args, (uint64_t)current->comm, 0, false, 0);
	CHECK_RES(res);

	/*
	 * cgroups
	 */
	args->str_storage[0] = 0;
#ifdef CONFIG_CGROUPS
	rcu_read_lock();
#include <linux/cgroup_subsys.h>
cgroups_error:
	rcu_read_unlock();
#endif

	res = val_to_ring(args, (int64_t)(long)args->str_storage, STR_STORAGE_SIZE - available, false, 0);
	CHECK_RES(res);

	if (args->event_type == PPME_SYSCALL_CLONE_20_X ||
		args->event_type == PPME_SYSCALL_FORK_20_X ||
		args->event_type == PPME_SYSCALL_VFORK_20_X ||
		args->event_type == PPME_SYSCALL_CLONE3_X) 
		{
		/*
		 * clone-only parameters
		 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
		uint32_t euid = from_kuid_munged(current_user_ns(), current_euid());
		uint32_t egid = from_kgid_munged(current_user_ns(), current_egid());
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		uint32_t euid = current_euid();
		uint32_t egid = current_egid();
#else
		uint32_t euid = current->euid;
		uint32_t egid = current->egid;
#endif
		int64_t in_pidns = 0;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		struct pid_namespace *pidns = task_active_pid_ns(current);
#endif

		/*
		 * flags
		 */
		switch (args->event_type)
		{
		case PPME_SYSCALL_CLONE_20_X:
#ifdef CONFIG_S390
			syscall_get_arguments_deprecated(args, 1, 1, &val);
#else
			syscall_get_arguments_deprecated(args, 0, 1, &val);
#endif
			break;

		case PPME_SYSCALL_CLONE3_X:
#ifdef __NR_clone3
			syscall_get_arguments_deprecated(args, 0, 1, &val);
			res = ppm_copy_from_user(&cl_args, (void *)val, sizeof(struct clone_args));
			if (unlikely(res != 0))
			{
				return PPM_FAILURE_INVALID_USER_MEMORY;
			}
			val = cl_args.flags;
#else
			val = 0;
#endif
			break;
		
		default:
			val = 0;
			break;
		}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		if(pidns != &init_pid_ns || pid_ns_for_children(current) != pidns)
			in_pidns = PPM_CL_CHILD_IN_PIDNS;
#endif
		res = val_to_ring(args, (uint64_t)clone_flags_to_scap((int) val) | in_pidns, 0, false, 0);
		CHECK_RES(res);

		/*
		 * uid
		 */
		res = val_to_ring(args, euid, 0, false, 0);
		CHECK_RES(res);

		/*
		 * gid
		 */
		res = val_to_ring(args, egid, 0, false, 0);
		CHECK_RES(res);

		/*
		 * vtid
		 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		res = val_to_ring(args, task_pid_vnr(current), 0, false, 0);
#else
		/* Not relevant in old kernels */
		res = val_to_ring(args, 0, 0, false, 0);
#endif
		CHECK_RES(res);

		/*
		 * vpid
		 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		res = val_to_ring(args, task_tgid_vnr(current), 0, false, 0);
#else
		/* Not relevant in old kernels */
		res = val_to_ring(args, 0, 0, false, 0);
#endif
		CHECK_RES(res);

		/*
		 * pid_namespace init task start_time monotonic time in ns
		 * the field `start_time` was a `struct timespec` before this
		 * kernel version.
		 * https://elixir.bootlin.com/linux/v3.16/source/include/linux/sched.h#L1370
		 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
		// only perform lookup when clone/vfork/fork returns 0 (child process / childtid)
		if(retval == 0 && pidns && pidns->child_reaper)
		{
			pidns_init_start_time = pidns->child_reaper->start_time;
		}
		res = val_to_ring(args, pidns_init_start_time, 0, false, 0);
#else
		/* Not relevant in old kernels */
		res = val_to_ring(args, 0, 0, false, 0);
#endif
		CHECK_RES(res);

	} else if (args->event_type == PPME_SYSCALL_EXECVE_19_X || 
			   args->event_type == PPME_SYSCALL_EXECVEAT_X) {
		/*
		 * execve family parameters.
		 */
		long env_len = 0;
		uint32_t tty_nr = 0;
		bool exe_writable = false;
		bool exe_upper_layer = false;
		struct file *exe_file = NULL;
		uint32_t flags = 0; // execve additional flags
		unsigned long i_ino = 0;
		unsigned long ctime = 0;
		unsigned long mtime = 0;
		uint32_t loginuid = UINT32_MAX;
		uint64_t cap_inheritable = 0;
		uint64_t cap_permitted = 0;
		uint64_t cap_effective = 0;
		uint32_t euid = UINT32_MAX;
		char* buf = (char*)args->str_storage;
		char *trusted_exepath = NULL;

		if (likely(retval >= 0)) {
			/*
			 * Already checked for mm validity
			 */
			env_len = mm->env_end - mm->env_start;

			if (env_len) {
				if (env_len > PAGE_SIZE)
					env_len = PAGE_SIZE;

				if (unlikely(ppm_copy_from_user(args->str_storage, (const void __user *)mm->env_start, env_len)))
					env_len = 0;
				else
					args->str_storage[env_len - 1] = 0;
			}
		} else {
			/*
			 * The call failed, so get the env from the arguments
			 */
			switch (args->event_type)
			{
			case PPME_SYSCALL_EXECVE_19_X:
				syscall_get_arguments_deprecated(args, 2, 1, &val);
				break;
			
			case PPME_SYSCALL_EXECVEAT_X:
				syscall_get_arguments_deprecated(args, 3, 1, &val);
				break;

			default:
				val = 0;
				break;
			} 
#ifdef CONFIG_COMPAT
			if (unlikely(args->compat))
				env_len = compat_accumulate_argv_or_env((compat_uptr_t)val,
							  args->str_storage, available);
			else
#endif
				env_len = accumulate_argv_or_env((const char __user * __user *)val,
							  args->str_storage, available);

			if (unlikely(env_len < 0))
				env_len = 0;
		}

		if (env_len == 0)
			*args->str_storage = 0;

		/*
		 * environ
		 */
		res = val_to_ring(args, (int64_t)(long)args->str_storage, env_len, false, 0);
		CHECK_RES(res);

		/*
		 * tty
		 */
		tty_nr = ppm_get_tty();
		res = val_to_ring(args, tty_nr, 0, false, 0);
		CHECK_RES(res);

		/*
		 * pgid
		 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
		res = val_to_ring(args, (int64_t)task_pgrp_nr_ns(current, task_active_pid_ns(current)), 0, false, 0);
#else
		res = val_to_ring(args, (int64_t)process_group(current), 0, false, 0);
#endif
		CHECK_RES(res);

		/*
	 	* loginuid
	 	*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
		loginuid = from_kuid(current_user_ns(), audit_get_loginuid(current));
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
		loginuid = audit_get_loginuid(current);
#else
		loginuid = audit_get_loginuid(current->audit_context);
#endif
		res = val_to_ring(args, loginuid, 0, false, 0);
		CHECK_RES(res);

		/*
		 * exe_writable and exe_upper_layer flags
		 */

		exe_file = ppm_get_mm_exe_file(mm);

		if (exe_file != NULL) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
			if (file_inode(exe_file) != NULL)
			{
				/* Support exe_writable */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 3, 0)
				exe_writable |= (file_permission(exe_file, MAY_WRITE | MAY_NOT_BLOCK) == 0);
				exe_writable |= inode_owner_or_capable(file_mnt_idmap(exe_file), file_inode(exe_file));
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
				exe_writable |= (inode_permission(current_user_ns(), file_inode(exe_file), MAY_WRITE | MAY_NOT_BLOCK) == 0);
				exe_writable |= inode_owner_or_capable(current_user_ns(), file_inode(exe_file));
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
				exe_writable |= (inode_permission(file_inode(exe_file), MAY_WRITE | MAY_NOT_BLOCK) == 0);
				exe_writable |= inode_owner_or_capable(file_inode(exe_file));
#endif
				/*
				 * Kernels < 3.1.0 doesn't support the exe_writable flags due to the MAY_NOT_BLOCK not being
				 * available. This limitation is related to the fact that this function (f_sched_prog_exec)
				 * is in a RCU critical section: this means that this function (and its callee) MUST NOT
				 * call functions that can yield the processor (e.g. inode_permission that deep down in its
				 * call stack calls a down_read()). This is addressed after the Kernel 3.1.0 where the
				 * MAY_OT_BLOCK flag is introduced and avoids the processor to being yield.
				 */

				/* Support exe_upper_layer */
				exe_upper_layer = ppm_is_upper_layer(exe_file);

				/* Support exe_from_memfd */
				flags |= get_exe_from_memfd(exe_file);

				/* Support inode number */
				i_ino = file_inode(exe_file)->i_ino;

				/* Support exe_file ctime 
				 * During kernel versions `i_ctime` changed from `struct timespec` to `struct timespec64`
				 * but fields names should be always the same.
				 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 6, 0)
				{
					struct timespec64 inode_ctime;
					inode_ctime = inode_get_ctime(file_inode(exe_file));
					ctime = inode_ctime.tv_sec * (uint64_t) 1000000000 + inode_ctime.tv_nsec;
				}
#else
				ctime = file_inode(exe_file)->i_ctime.tv_sec * (uint64_t) 1000000000 + file_inode(exe_file)->i_ctime.tv_nsec;
#endif
				/* Support exe_file mtime 
				 * During kernel versions `i_mtime` changed from `struct timespec` to `struct timespec64`
				 * but fields names should be always the same.
				 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 7, 0)
				{
					struct timespec64 inode_mtime;
					inode_mtime = inode_get_mtime(file_inode(exe_file));
					mtime = inode_mtime.tv_sec * (uint64_t)1000000000 + inode_mtime.tv_nsec;
				}
#else
				mtime = file_inode(exe_file)->i_mtime.tv_sec * (uint64_t) 1000000000 + file_inode(exe_file)->i_mtime.tv_nsec;
#endif
			}
#endif
			/* Before freeing the exefile we catch the resolved path for symlink resolution */
			trusted_exepath = d_path(&exe_file->f_path, buf, PAGE_SIZE);
			fput(exe_file);
		}

		/* The trusted_exepath could end with the suffix " (deleted)".
		 * https://github.com/torvalds/linux/blob/2dde18cd1d8fac735875f2e4987f11817cc0bc2c/fs/d_path.c#L255
		 * This is unhandy to manage in userspace, for this reason, we can remove it here
		 */
		if(trusted_exepath != NULL)
		{
			char deleted_suffix[] = " (deleted)";
			int diff_len = strlen(trusted_exepath) - strlen(deleted_suffix);
			if(diff_len > 0 &&
				(strncmp(&trusted_exepath[diff_len], deleted_suffix, sizeof(deleted_suffix)) == 0))
			{					
				trusted_exepath[diff_len] = '\0';
			}
		}

		if (exe_writable) {
			flags |= PPM_EXE_WRITABLE;
		}

		if (exe_upper_layer) {
			flags |= PPM_EXE_UPPER_LAYER;
		}

		// write all the additional flags for execve family here...

		/*
		 * flags
		 */
		res = val_to_ring(args, flags, 0, false, 0);
		CHECK_RES(res);

		/*
		 * capabilities
		 */
		cred = get_current_cred();
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0)
		cap_inheritable = ((uint64_t)cred->cap_inheritable.cap[1] << 32) | cred->cap_inheritable.cap[0];
		cap_permitted = ((uint64_t)cred->cap_permitted.cap[1] << 32) | cred->cap_permitted.cap[0];
		cap_effective = ((uint64_t)cred->cap_effective.cap[1] << 32) | cred->cap_effective.cap[0];
#else
		cap_inheritable = (uint64_t)cred->cap_inheritable.val;
		cap_permitted = (uint64_t)cred->cap_permitted.val;
		cap_effective = (uint64_t)cred->cap_effective.val;
#endif
		put_cred(cred);

		/* Parameter 21: cap_inheritable (type: PT_UINT64) */
		res = val_to_ring(args, capabilities_to_scap(cap_inheritable), 0, false, 0);
		CHECK_RES(res);

		/* Parameter 22: cap_permitted (type: PT_UINT64) */
		res = val_to_ring(args, capabilities_to_scap(cap_permitted), 0, false, 0);
		CHECK_RES(res);

		/* Parameter 23: cap_effective (type: PT_UINT64) */
		res = val_to_ring(args, capabilities_to_scap(cap_effective), 0, false, 0);
		CHECK_RES(res);
		
		/*
		 * exe ino fields
		 */

		/* Parameter 24: exe_file ino (type: PT_UINT64) */
		res = val_to_ring(args, i_ino, 0, false, 0);
		CHECK_RES(res);

		/* Parameter 25: exe_file ctime (last status change time, epoch value in nanoseconds) (type: PT_ABSTIME) */
		res = val_to_ring(args, ctime, 0, false, 0);
		CHECK_RES(res);

		/* Parameter 26: exe_file mtime (last modification time, epoch value in nanoseconds) (type: PT_ABSTIME) */
		res = val_to_ring(args, mtime, 0, false, 0);
		CHECK_RES(res);

		/* Parameter 27: euid (type: PT_UID) */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
		euid = from_kuid_munged(current_user_ns(), current_euid());
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
		euid = current_euid();
#else
		euid = current->euid;
#endif
		res = val_to_ring(args, euid, 0, false, 0);
		CHECK_RES(res);

		/* Parameter 28: trusted_exepath (type: PT_FSPATH) */
		res = val_to_ring(args, (unsigned long)trusted_exepath, 0, false, 0);
		CHECK_RES(res);
	}
	return add_sentinel(args);
}

int f_sys_execve_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	/*
	 * filename
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_execveat_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;
	unsigned long flags;
	int32_t fd;

	/*
	 * dirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
	{
		fd = PPM_AT_FDCWD;
	}

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pathname
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	flags = execveat_flags_to_scap(val);

	res = val_to_ring(args, flags, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_socket_bind_e(struct event_filler_arguments *args)
{
	int res = 0;
	int32_t fd = 0;
	unsigned long val = 0;
	
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	
	/* Parameter 1: fd (type: PT_FD) */
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_socket_bind_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;
	int err = 0;
	uint16_t size = 0;
	struct sockaddr __user *usrsockaddr;
	unsigned long val;
	struct sockaddr_storage address;
	char *targetbuf = args->str_storage;

	/*
	 * res
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);

	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	usrsockaddr = (struct sockaddr __user *)val;

	/*
	 * Get the address len
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	if (usrsockaddr != NULL && val != 0) {
		/*
		 * Copy the address
		 */
		err = addr_to_kernel(usrsockaddr, val, (struct sockaddr *)&address);
		if (likely(err >= 0)) {
			/*
			 * Convert the fd into socket endpoint information
			 */
			size = pack_addr((struct sockaddr *)&address,
				val,
				targetbuf,
				STR_STORAGE_SIZE);
		}
	}

	/*
	 * Copy the endpoint info into the ring
	 */
	res = val_to_ring(args,
			    (uint64_t)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_connect_e(struct event_filler_arguments *args)
{
	int res;
	int err = 0;
	int fd;
	struct sockaddr __user *usrsockaddr;
	uint16_t size = 0;
	char *targetbuf = args->str_storage;
	struct sockaddr_storage address;
	unsigned long val;

	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int)val;

	res = val_to_ring(args, fd, 0, true, 0);
	CHECK_RES(res);

	if (fd >= 0) {
		/*
		 * Get the address
		 */
		syscall_get_arguments_deprecated(args, 1, 1, &val);

		usrsockaddr = (struct sockaddr __user *)val;

		/*
		 * Get the address len
		 */
		syscall_get_arguments_deprecated(args, 2, 1, &val);

		if (usrsockaddr != NULL && val != 0) {
			/*
			* Copy the address
			*/
			err = addr_to_kernel(usrsockaddr, val, (struct sockaddr *)&address);
			if (likely(err >= 0)) {
				/*
				* Convert the fd into socket endpoint information
				*/
				size = pack_addr((struct sockaddr *)&address,
					val,
					targetbuf,
					STR_STORAGE_SIZE);
			}
		}
	}

	/*
	 * Copy the endpoint info into the ring
	 */
	res = val_to_ring(args,
			    (uint64_t)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_connect_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;
	int err = 0;
	int fd;
	struct sockaddr __user *usrsockaddr;
	uint16_t size = 0;
	char *targetbuf = args->str_storage;
	struct sockaddr_storage address;
	unsigned long val;

	/*
	 * Push the result
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);

	/*
	 * Retrieve the fd and push it to the ring.
	 * Note that, even if we are in the exit callback, the arguments are still
	 * in the stack, and therefore we can consume them.
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int)val;

	if (fd >= 0) {
		/*
		 * Get the address
		 */
		syscall_get_arguments_deprecated(args, 1, 1, &val);

		usrsockaddr = (struct sockaddr __user *)val;

		/*
		 * Get the address len
		 */
		syscall_get_arguments_deprecated(args, 2, 1, &val);

		if (usrsockaddr != NULL && val != 0) {
			/*
			 * Copy the address
			 */
			err = addr_to_kernel(usrsockaddr, val, (struct sockaddr *)&address);
			if (likely(err >= 0)) {
				/*
				 * Convert the fd into socket endpoint information
				 */
				size = fd_to_socktuple(fd,
					(struct sockaddr *)&address,
					val,
					true,
					false,
					targetbuf,
					STR_STORAGE_SIZE);
			}
		}
	}

	/*
	 * Copy the endpoint info into the ring
	 */
	res = val_to_ring(args,
			    (uint64_t)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	res = val_to_ring(args, fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_socketpair_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;
	unsigned long val;
	/* In case of failure we send invalid fd (-1) */
	int fds[2] = {-1, -1};
	int err;
	struct socket *sock;
	struct unix_sock *us;
	struct sock *speer;

	/*
	 * retval
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * If the call was successful, copy the FDs
	 */
	if (likely(retval >= 0)) {
		/*
		 * fds
		 */
		syscall_get_arguments_deprecated(args, 3, 1, &val);
#ifdef CONFIG_COMPAT
		if (!args->compat) {
#endif
			if (unlikely(ppm_copy_from_user(fds, (const void __user *)val, sizeof(fds))))
				return PPM_FAILURE_INVALID_USER_MEMORY;
#ifdef CONFIG_COMPAT
		} else {
			if (unlikely(ppm_copy_from_user(fds, (const void __user *)compat_ptr(val), sizeof(fds))))
				return PPM_FAILURE_INVALID_USER_MEMORY;
		}
#endif

		res = val_to_ring(args, (int64_t)fds[0], 0, false, 0);
		CHECK_RES(res);

		res = val_to_ring(args, (int64_t)fds[1], 0, false, 0);
		CHECK_RES(res);

		/* get socket source and peer address */
		sock = sockfd_lookup(fds[0], &err);
		if (likely(sock != NULL)) {
			us = unix_sk(sock->sk);
			speer = us->peer;
			res = val_to_ring(args, (unsigned long)us, 0, false, 0);
			if (unlikely(res != PPM_SUCCESS)) {
				sockfd_put(sock);
				return res;
			}

			res = val_to_ring(args, (unsigned long)speer, 0, false, 0);
			if (unlikely(res != PPM_SUCCESS)) {
				sockfd_put(sock);
				return res;
			}

			sockfd_put(sock);
		} else {
			return err;
		}
	} else {
		res = val_to_ring(args, (int64_t)fds[0], 0, false, 0);
		CHECK_RES(res);

		res = val_to_ring(args, (int64_t)fds[1], 0, false, 0);
		CHECK_RES(res);

		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);

		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	return add_sentinel(args);
}

static int parse_sockopt(struct event_filler_arguments *args, int level, int optname, const void __user *optval, int optlen)
{
	int32_t val32 = 0;
	uint64_t val64 = 0;
	struct __aux_timeval tv = {0};

	if(level != SOL_SOCKET)
	{
		return val_to_ring(args, (unsigned long)optval, optlen, true, PPM_SOCKOPT_IDX_UNKNOWN);
	}

	switch (optname) {
#ifdef SO_ERROR
		case SO_ERROR:
			/* in case of failure we have to clear again the value */
			if(unlikely(ppm_copy_from_user(&val32, optval, sizeof(val32))))
			{
				val32 = 0;
			}
			return val_to_ring(args, (int64_t)-val32, 0, false, PPM_SOCKOPT_IDX_ERRNO);
#endif

#ifdef SO_RCVTIMEO
		case SO_RCVTIMEO:
#endif
#if (defined(SO_RCVTIMEO_OLD) && !defined(SO_RCVTIMEO)) || (defined(SO_RCVTIMEO_OLD) && (SO_RCVTIMEO_OLD != SO_RCVTIMEO))
		case SO_RCVTIMEO_OLD:
#endif			
#if (defined(SO_RCVTIMEO_NEW) && !defined(SO_RCVTIMEO)) || (defined(SO_RCVTIMEO_NEW) && (SO_RCVTIMEO_NEW != SO_RCVTIMEO)) 
		case SO_RCVTIMEO_NEW:
#endif
#ifdef SO_SNDTIMEO
		case SO_SNDTIMEO:
#endif
#if (defined(SO_SNDTIMEO_OLD) && !defined(SO_SNDTIMEO)) || (defined(SO_SNDTIMEO_OLD) && (SO_SNDTIMEO_OLD != SO_SNDTIMEO))
		case SO_SNDTIMEO_OLD:
#endif
#if (defined(SO_SNDTIMEO_NEW) && !defined(SO_SNDTIMEO)) || (defined(SO_SNDTIMEO_NEW) && (SO_SNDTIMEO_NEW != SO_SNDTIMEO))
		case SO_SNDTIMEO_NEW:
#endif
			if(unlikely(ppm_copy_from_user(&tv, optval, sizeof(tv))))
			{
				tv.tv_sec = 0;
				tv.tv_usec = 0;
			}
			return val_to_ring(args, tv.tv_sec * SECOND_IN_NS + tv.tv_usec * USECOND_IN_NS, 0, false, PPM_SOCKOPT_IDX_TIMEVAL);

#ifdef SO_COOKIE
		case SO_COOKIE:
			if(unlikely(ppm_copy_from_user(&val64, optval, sizeof(val64))))
			{
				val64 = 0;
			}
			return val_to_ring(args, val64, 0, false, PPM_SOCKOPT_IDX_UINT64);
#endif

#ifdef SO_DEBUG
		case SO_DEBUG:
#endif
#ifdef SO_REUSEADDR
		case SO_REUSEADDR:
#endif
#ifdef SO_TYPE
		case SO_TYPE:
#endif
#ifdef SO_DONTROUTE
		case SO_DONTROUTE:
#endif
#ifdef SO_BROADCAST
		case SO_BROADCAST:
#endif
#ifdef SO_SNDBUF
		case SO_SNDBUF:
#endif
#ifdef SO_RCVBUF
		case SO_RCVBUF:
#endif
#ifdef SO_SNDBUFFORCE
		case SO_SNDBUFFORCE:
#endif
#ifdef SO_RCVBUFFORCE
		case SO_RCVBUFFORCE:
#endif
#ifdef SO_KEEPALIVE
		case SO_KEEPALIVE:
#endif
#ifdef SO_OOBINLINE
		case SO_OOBINLINE:
#endif
#ifdef SO_NO_CHECK
		case SO_NO_CHECK:
#endif
#ifdef SO_PRIORITY
		case SO_PRIORITY:
#endif
#ifdef SO_BSDCOMPAT
		case SO_BSDCOMPAT:
#endif
#ifdef SO_REUSEPORT
		case SO_REUSEPORT:
#endif
#ifdef SO_PASSCRED
		case SO_PASSCRED:
#endif
#ifdef SO_RCVLOWAT
		case SO_RCVLOWAT:
#endif
#ifdef SO_SNDLOWAT
		case SO_SNDLOWAT:
#endif
#ifdef SO_SECURITY_AUTHENTICATION
		case SO_SECURITY_AUTHENTICATION:
#endif
#ifdef SO_SECURITY_ENCRYPTION_TRANSPORT
		case SO_SECURITY_ENCRYPTION_TRANSPORT:
#endif
#ifdef SO_SECURITY_ENCRYPTION_NETWORK
		case SO_SECURITY_ENCRYPTION_NETWORK:
#endif
#ifdef SO_BINDTODEVICE
		case SO_BINDTODEVICE:
#endif
#ifdef SO_DETACH_FILTER
		case SO_DETACH_FILTER:
#endif
#ifdef SO_TIMESTAMP
		case SO_TIMESTAMP:
#endif
#ifdef SO_ACCEPTCONN
		case SO_ACCEPTCONN:
#endif
#ifdef SO_PEERSEC
		case SO_PEERSEC:
#endif
#ifdef SO_PASSSEC
		case SO_PASSSEC:
#endif
#ifdef SO_TIMESTAMPNS
		case SO_TIMESTAMPNS:
#endif
#ifdef SO_MARK
		case SO_MARK:
#endif
#ifdef SO_TIMESTAMPING
		case SO_TIMESTAMPING:
#endif
#ifdef SO_PROTOCOL
		case SO_PROTOCOL:
#endif
#ifdef SO_DOMAIN
		case SO_DOMAIN:
#endif
#ifdef SO_RXQ_OVFL
		case SO_RXQ_OVFL:
#endif
#ifdef SO_WIFI_STATUS
		case SO_WIFI_STATUS:
#endif
#ifdef SO_PEEK_OFF
		case SO_PEEK_OFF:
#endif
#ifdef SO_NOFCS
		case SO_NOFCS:
#endif
#ifdef SO_LOCK_FILTER
		case SO_LOCK_FILTER:
#endif
#ifdef SO_SELECT_ERR_QUEUE
		case SO_SELECT_ERR_QUEUE:
#endif
#ifdef SO_BUSY_POLL
		case SO_BUSY_POLL:
#endif
#ifdef SO_MAX_PACING_RATE
		case SO_MAX_PACING_RATE:
#endif
#ifdef SO_BPF_EXTENSIONS
		case SO_BPF_EXTENSIONS:
#endif
#ifdef SO_INCOMING_CPU
		case SO_INCOMING_CPU:
#endif
			if(unlikely(ppm_copy_from_user(&val32, optval, sizeof(val32))))
			{
				val32 = 0;
			}
			return val_to_ring(args, val32, 0, false, PPM_SOCKOPT_IDX_UINT32);

		default:
			return val_to_ring(args, (unsigned long)optval, optlen, true, PPM_SOCKOPT_IDX_UNKNOWN);
	}
}

int f_sys_setsockopt_x(struct event_filler_arguments *args)
{
	int res = 0;
	long retval = 0;
	unsigned long val[5] = {0};
	int32_t fd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Get all the five arguments */
	syscall_get_arguments_deprecated(args, 0, 5, val);

	/* Parameter 2: fd (type: PT_FD) */
	fd = (int32_t)val[0];
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: level (type: PT_ENUMFLAGS8) */
	res = val_to_ring(args, sockopt_level_to_scap(val[1]), 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: optname (type: PT_ENUMFLAGS8) */
	res = val_to_ring(args, sockopt_optname_to_scap(val[1], val[2]), 0, true, 0);
	CHECK_RES(res);

	/* Parameter 5: optval (type: PT_DYN) */
	res = parse_sockopt(args, val[1], val[2], (const void __user*)val[3], val[4]);
	CHECK_RES(res);

	/* Parameter 6: optlen (type: PT_UINT32) */
	res = val_to_ring(args, val[4], 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getsockopt_x(struct event_filler_arguments *args)
{
	int res = 0;
	int64_t retval = 0;
	uint32_t optlen = 0;
	int32_t fd = 0;
	unsigned long val[5] = {0};

	/* Get all the five arguments */
	syscall_get_arguments_deprecated(args, 0, 5, val);

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	fd = (int32_t)val[0];
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: level (type: PT_ENUMFLAGS8) */
	res = val_to_ring(args, sockopt_level_to_scap(val[1]), 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: optname (type: PT_ENUMFLAGS8) */
	res = val_to_ring(args, sockopt_optname_to_scap(val[1], val[2]), 0, true, 0);
	CHECK_RES(res);

	/* `optval` and `optlen` will be the ones provided by the user if the syscall fails
	 * otherwise they will refer to the real socket data since the kernel populated them.
	 */

	/* Extract optlen */
	if(unlikely(ppm_copy_from_user(&optlen, (const void __user*)val[4], sizeof(optlen))))
	{
		optlen = 0;
	}

	/* Parameter 5: optval (type: PT_DYN) */
	res = parse_sockopt(args, val[1], val[2], (const void __user*)val[3], optlen);
	CHECK_RES(res);

	/* Parameter 6: optlen (type: PT_UINT32) */
	res = val_to_ring(args, optlen, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_accept4_e(struct event_filler_arguments *args)
{
	int res;

	/*
	 * push the flags into the ring.
	 * XXX we don't support flags yet and so we just return zero
	 */
	/* res = val_to_ring(args, args->socketcall_args[3]); */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_accept_x(struct event_filler_arguments *args)
{
	int res;
	int fd;
	char *targetbuf = args->str_storage;
	uint16_t size = 0;
	unsigned long queuepct = 0;
	unsigned long ack_backlog = 0;
	unsigned long max_ack_backlog = 0;
	unsigned long srvskfd;
	int err = 0;
	struct socket *sock;

	/*
	 * Push the fd
	 */
	fd = syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	if (fd >= 0)
	{
		/*
		 * Convert the fd into socket endpoint information
		 */
		size = fd_to_socktuple(fd,
				NULL,
				0,
				false,
				true,
				targetbuf,
				STR_STORAGE_SIZE);
		/*
		 * queuepct
		 */
		syscall_get_arguments_deprecated(args, 0, 1, &srvskfd);

		sock = sockfd_lookup(srvskfd, &err);

		if (sock && sock->sk) {
			ack_backlog = sock->sk->sk_ack_backlog;
			max_ack_backlog = sock->sk->sk_max_ack_backlog;
		}

		if (sock)
			sockfd_put(sock);

		if (max_ack_backlog)
			queuepct = (unsigned long)ack_backlog * 100 / max_ack_backlog;

		/* Parameter 2: tuple (type: PT_SOCKTUPLE) */
		res = val_to_ring(args,
				(uint64_t)targetbuf,
				size,
				false,
				0);
		CHECK_RES(res);
	}
	else
	{
		/* Parameter 2: tuple (type: PT_SOCKTUPLE) */
		res = push_empty_param(args);
		CHECK_RES(res);
	}

	/* Parameter 3: queuepct (type: PT_UINT8) */
	res = val_to_ring(args, queuepct, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: queuelen (type: PT_UINT32) */
	res = val_to_ring(args, ack_backlog, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: queuemax (type: PT_UINT32) */
	res = val_to_ring(args, max_ack_backlog, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_send_e_common(struct event_filler_arguments *args, int *fd)
{
	int res;
	unsigned long size;
	unsigned long val;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	*fd = val;

	/*
	 * size
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &size);

	res = val_to_ring(args, size, 0, false, 0);
	CHECK_RES(res);

	return PPM_SUCCESS;
}

int f_sys_send_e(struct event_filler_arguments *args)
{
	int res;
	int fd;

	res = f_sys_send_e_common(args, &fd);

	if (likely(res == PPM_SUCCESS))
		return add_sentinel(args);
	return res;
}

int f_sys_sendto_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	uint16_t size = 0;
	char *targetbuf = args->str_storage;
	int fd;
	struct sockaddr __user *usrsockaddr;
	struct sockaddr_storage address;
	int err = 0;

	*targetbuf = 250;

	/*
	 * Push the common params to the ring
	 */
	res = f_sys_send_e_common(args, &fd);
	CHECK_RES(res);

	/*
	 * Get the address
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &val);

	usrsockaddr = (struct sockaddr __user *)val;

	/*
	 * Get the address len
	 */
	syscall_get_arguments_deprecated(args, 5, 1, &val);

	if (usrsockaddr != NULL && val != 0) {
		/*
		 * Copy the address
		 */
		err = addr_to_kernel(usrsockaddr, val, (struct sockaddr *)&address);
		if (likely(err >= 0)) {
			/*
			 * Convert the fd into socket endpoint information
			 */
			size = fd_to_socktuple(fd,
				(struct sockaddr *)&address,
				val,
				true,
				false,
				targetbuf,
				STR_STORAGE_SIZE);
		}
	}

	/*
	 * Copy the endpoint info into the ring
	 */
	res = val_to_ring(args,
			    (uint64_t)(unsigned long)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_send_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	unsigned long bufsize;

	/*
	 * Retrieve the FD. It will be used for dynamic snaplen calculation.
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	args->fd = (int)val;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* If the syscall doesn't fail we use the return value as `size`
	 * otherwise we need to rely on the syscall parameter provided by the user.
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	bufsize = retval > 0 ? retval : val;

	syscall_get_arguments_deprecated(args, 1, 1, &val);

	args->enforce_snaplen = true;
	res = val_to_ring(args, val, bufsize, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_recv_x_common(struct event_filler_arguments *args, int64_t *retval)
{
	int res;
	unsigned long val;
	unsigned long bufsize;

	/*
	 * Retrieve the FD. It will be used for dynamic snaplen calculation.
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	args->fd = (int)val;

	/*
	 * res
	 */
	*retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, *retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * data
	 */
	if (*retval < 0) {
		/*
		 * The operation failed, return an empty buffer
		 */
		val = 0;
		bufsize = 0;
	} else {
		syscall_get_arguments_deprecated(args, 1, 1, &val);

		/*
		 * The return value can be lower than the value provided by the user,
		 * and we take that into account.
		 */
		bufsize = *retval;
	}

	args->enforce_snaplen = true;
	res = val_to_ring(args, val, bufsize, true, 0);

	return res;
}

int f_sys_recv_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;

	res = f_sys_recv_x_common(args, &retval);

	if (likely(res == PPM_SUCCESS))
		return add_sentinel(args);
	return res;
}

int f_sys_recvfrom_e(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: size (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_recvfrom_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	uint16_t size = 0;
	int64_t retval;
	char *targetbuf = args->str_storage;
	int fd;
	struct sockaddr __user *usrsockaddr;
	struct sockaddr_storage address;
	int addrlen;
	int err = 0;

	/*
	 * Push the common params to the ring
	 */
	res = f_sys_recv_x_common(args, &retval);
	CHECK_RES(res);

	if (retval >= 0) {
		/*
		 * Get the fd
		 */
		syscall_get_arguments_deprecated(args, 0, 1, &val);
		fd = (int)val;

		/*
		 * Get the address
		 */
		syscall_get_arguments_deprecated(args, 4, 1, &val);
		usrsockaddr = (struct sockaddr __user *)val;

		/*
		 * Get the address len
		 */
		syscall_get_arguments_deprecated(args, 5, 1, &val);
		if (usrsockaddr != NULL && val != 0) {
#ifdef CONFIG_COMPAT
			if (!args->compat) {
#endif
				if (unlikely(ppm_copy_from_user(&addrlen, (const void __user *)val, sizeof(addrlen))))
					return PPM_FAILURE_INVALID_USER_MEMORY;
#ifdef CONFIG_COMPAT
			} else {
				if (unlikely(ppm_copy_from_user(&addrlen, (const void __user *)compat_ptr(val), sizeof(addrlen))))
					return PPM_FAILURE_INVALID_USER_MEMORY;
			}
#endif

			/*
			 * Copy the address
			 */
			err = addr_to_kernel(usrsockaddr, addrlen, (struct sockaddr *)&address);
			if (likely(err >= 0)) {
				/*
				 * Convert the fd into socket endpoint information
				 */
				size = fd_to_socktuple(fd,
					(struct sockaddr *)&address,
					addrlen,
					true,
					true,
					targetbuf,
					STR_STORAGE_SIZE);
			}
		}
	}

	/*
	 * Copy the endpoint info into the ring
	 */
	res = val_to_ring(args,
			    (uint64_t)(unsigned long)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_sendmsg_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
	struct user_msghdr mh;
#else
	struct msghdr mh;
#endif
	char *targetbuf = args->str_storage;
	const struct iovec __user *iov;
#ifdef CONFIG_COMPAT
	const struct compat_iovec __user *compat_iov;
	struct compat_msghdr compat_mh;
#endif
	unsigned long iovcnt;
	int fd;
	uint16_t size = 0;
	int addrlen;
	int err = 0;
	struct sockaddr __user *usrsockaddr;
	struct sockaddr_storage address;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	fd = val;
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Retrieve the message header
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(&mh, (const void __user *)val, sizeof(mh))))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		/*
		 * size
		 */
		iov = (const struct iovec __user *)mh.msg_iov;
		iovcnt = mh.msg_iovlen;

		res = parse_readv_writev_bufs(args, iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);


		CHECK_RES(res);

		/*
		 * tuple
		 */
		usrsockaddr = (struct sockaddr __user *)mh.msg_name;
		addrlen = mh.msg_namelen;
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(&compat_mh, (const void __user *)compat_ptr(val), sizeof(compat_mh))))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		/*
		 * size
		 */
		compat_iov = (const struct compat_iovec __user *)compat_ptr(compat_mh.msg_iov);
		iovcnt = compat_mh.msg_iovlen;

		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);


		CHECK_RES(res);

		/*
		 * tuple
		 */
		usrsockaddr = (struct sockaddr __user *)compat_ptr(compat_mh.msg_name);
		addrlen = compat_mh.msg_namelen;
	}
#endif

	if (usrsockaddr != NULL && addrlen != 0) {
		/*
		 * Copy the address
		 */
		err = addr_to_kernel(usrsockaddr, addrlen, (struct sockaddr *)&address);
		if (likely(err >= 0)) {
			/*
			 * Convert the fd into socket endpoint information
			 */
			size = fd_to_socktuple(fd,
				(struct sockaddr *)&address,
				addrlen,
				true,
				false,
				targetbuf,
				STR_STORAGE_SIZE);
		}
	}

	/* Copy the endpoint info into the ring */
	res = val_to_ring(args,
			    (uint64_t)(unsigned long)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_sendmsg_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;
	long retval;
	const struct iovec __user *iov;
#ifdef CONFIG_COMPAT
	const struct compat_iovec __user *compat_iov;
	struct compat_msghdr compat_mh;
#endif
	unsigned long iovcnt;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
	struct user_msghdr mh;
#else
	struct msghdr mh;
#endif

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Retrieve the message header
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	/* Parameter 2: data (type: PT_BYTEBUF) */
#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(&mh, (const void __user *)val, sizeof(mh))))
		{
			res = val_to_ring(args, 0, 0, false, 0);
			CHECK_RES(res);
			return add_sentinel(args);
		}


		iov = (const struct iovec __user *)mh.msg_iov;
		iovcnt = mh.msg_iovlen;

		res = parse_readv_writev_bufs(args, iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_DATA | PRB_FLAG_IS_WRITE);
		CHECK_RES(res);
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(&compat_mh, (const void __user *)compat_ptr(val), sizeof(compat_mh))))
		{
			res = val_to_ring(args, 0, 0, false, 0);
			CHECK_RES(res);
			return add_sentinel(args);
		}

		compat_iov = (const struct compat_iovec __user *)compat_ptr(compat_mh.msg_iov);
		iovcnt = compat_mh.msg_iovlen;

		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_DATA | PRB_FLAG_IS_WRITE);
		CHECK_RES(res);
	}
#endif

	return add_sentinel(args);
}

int f_sys_listen_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;
	int32_t backlog = 0;

	/* Parameter 1: fd (type: PT_FD)*/
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: backlog (type: PT_INT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	backlog = (int32_t)val;
	res = val_to_ring(args, (int32_t)backlog, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_recvmsg_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD)*/
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_recvmsg_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;
	int64_t retval;
	const struct iovec __user *iov;
#ifdef CONFIG_COMPAT
	const struct compat_iovec __user *compat_iov;
	struct compat_msghdr compat_mh;
#endif
	unsigned long iovcnt;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
	struct user_msghdr mh;
#else
	struct msghdr mh;
#endif
	char *targetbuf = args->str_storage;
	int fd;
	struct sockaddr __user *usrsockaddr;
	struct sockaddr_storage address;
	uint16_t size = 0;
	int addrlen;
	int err = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* If the syscall fails we are not able to collect reliable params
	 * so we return empty ones.
	 */
	if(retval < 0)
	{
		/* Parameter 2: size (type: PT_UINT32) */
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);

		/* Parameter 3: data (type: PT_BYTEBUF) */
		res = push_empty_param(args);
		CHECK_RES(res);

		/* Parameter 4: tuple (type: PT_SOCKTUPLE) */
		res = push_empty_param(args);
		CHECK_RES(res);

		/* Parameter 5: msg_control (type: PT_BYTEBUF) */
		res = push_empty_param(args);
		CHECK_RES(res);

		return add_sentinel(args);
	}

	/*
	 * Retrieve the message header
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(&mh, (const void __user *)val, sizeof(mh))))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		/*
		 * data and size
		 */
		iov = (const struct iovec __user *)mh.msg_iov;
		iovcnt = mh.msg_iovlen;

		res = parse_readv_writev_bufs(args, iov, iovcnt, retval, PRB_FLAG_PUSH_ALL);
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(&compat_mh, (const void __user *)compat_ptr(val), sizeof(compat_mh))))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		/*
		 * data and size
		 */
		compat_iov = (const struct compat_iovec __user *)compat_ptr(compat_mh.msg_iov);
		iovcnt = compat_mh.msg_iovlen;

		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt, retval, PRB_FLAG_PUSH_ALL);
	}
#endif

	CHECK_RES(res);

	/*
	 * tuple
	 */
	if (retval >= 0) {
		/*
		 * Get the fd
		 */
		syscall_get_arguments_deprecated(args, 0, 1, &val);
		fd = (int)val;

		/*
		 * Get the address
		 */
		usrsockaddr = (struct sockaddr __user *)mh.msg_name;
		addrlen = mh.msg_namelen;

		if (usrsockaddr != NULL && addrlen != 0) {
			/*
			 * Copy the address
			 */
			err = addr_to_kernel(usrsockaddr, addrlen, (struct sockaddr *)&address);
			if (likely(err >= 0)) {
				/*
				 * Convert the fd into socket endpoint information
				 */
				size = fd_to_socktuple(fd,
					(struct sockaddr *)&address,
					addrlen,
					true,
					true,
					targetbuf,
					STR_STORAGE_SIZE);
			}
		}
	}

	/* Copy the endpoint info into the ring */
	res = val_to_ring(args,
			    (uint64_t)(unsigned long)targetbuf,
			    size,
			    false,
			    0);
	CHECK_RES(res);
	
	/* 
		msg_control: ancillary data.
	*/
	if (mh.msg_control != NULL && mh.msg_controllen > 0)
	{
		res = val_to_ring(args, (uint64_t)mh.msg_control, (uint32_t)mh.msg_controllen, true, 0);
		CHECK_RES(res);
	}
	else 
	{
		/* pushing empty data */
		res = push_empty_param(args);
		CHECK_RES(res);
	}

	return add_sentinel(args);
}

int f_sys_creat_e(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long modes;
	char *name = NULL;
	int res;

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	if(likely(ppm_strncpy_from_user(args->str_storage, (const void __user *)val, PPM_MAX_PATH_SIZE) >= 0))
	{
		name = args->str_storage;
		name[PPM_MAX_PATH_SIZE - 1] = '\0';
	}
	res = val_to_ring(args, (int64_t)(long)name, 0, false, 0);
	CHECK_RES(res);

	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(O_CREAT, modes), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_creat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long modes;
	uint32_t dev = 0;
	uint64_t ino = 0;
	int res;
	int64_t retval;

	/*
	 * fd
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(O_CREAT, modes), 0, false, 0);
	CHECK_RES(res);

	get_fd_dev_ino(retval, &dev, &ino);

	/*
	 *  dev
	 */
	res = val_to_ring(args, dev, 0, false, 0);
	CHECK_RES(res);

	/*
	 *  ino
	 */
	res = val_to_ring(args, ino, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pipe_x(struct event_filler_arguments *args)
{
	int res = 0;
	int64_t retval = 0;
	unsigned long val = 0;
	int pipefd[2] = {-1, -1};
	uint32_t dev = 0;
	uint64_t ino = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Here `val` is a pointer to the vector with the 2 file descriptors. */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(pipefd, (const void __user *)val, sizeof(pipefd))))
		{
			pipefd[0] = -1;
			pipefd[1] = -1;
		}
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(pipefd, (const void __user *)compat_ptr(val), sizeof(pipefd))))
		{
			pipefd[0] = -1;
			pipefd[1] = -1;
		}
	}
#endif

	/* Parameter 2: fd1 (type: PT_FD) */
	res = val_to_ring(args, (int64_t)pipefd[0], 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: fd2 (type: PT_FD) */
	res = val_to_ring(args, (int64_t)pipefd[1], 0, false, 0);
	CHECK_RES(res);

	/* On success, pipe returns `0` */
	if(retval == 0)
	{
		get_fd_dev_ino(pipefd[0], &dev, &ino);
	}

	/* Parameter 4: ino (type: PT_UINT64) */
	res = val_to_ring(args, ino, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pipe2_x(struct event_filler_arguments *args)
{
	int res = 0;
	int64_t retval = 0;
	unsigned long val = 0;
	int pipefd[2] = {-1, -1};
	uint32_t dev = 0;
	uint64_t ino = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Here `val` is a pointer to the vector with the 2 file descriptors. */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(pipefd, (const void __user *)val, sizeof(pipefd))))
		{
			pipefd[0] = -1;
			pipefd[1] = -1;
		}
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(pipefd, (const void __user *)compat_ptr(val), sizeof(pipefd))))
		{
			pipefd[0] = -1;
			pipefd[1] = -1;
		}
	}
#endif

	/* Parameter 2: fd1 (type: PT_FD) */
	res = val_to_ring(args, (int64_t)pipefd[0], 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: fd2 (type: PT_FD) */
	res = val_to_ring(args, (int64_t)pipefd[1], 0, false, 0);
	CHECK_RES(res);

	/* On success, pipe returns `0` */
	if(retval == 0)
	{
		get_fd_dev_ino(pipefd[0], &dev, &ino);
	}

	/* Parameter 4: ino (type: PT_UINT64) */
	res = val_to_ring(args, ino, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, pipe2_flags_to_scap((int32_t)val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_eventfd_e(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;

	/* Parameter 1: initval (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: flags (type: PT_FLAGS32) */
	/* The syscall eventfd has no flags! only `eventfd2` has the `flags` param.
	 * For compatibility with the event definition here we send `0` as flags.
	 */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_eventfd2_e(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;

	/* Parameter 1: initval (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_eventfd2_x(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	long retval = 0;

	/* Parameter 1: res (type: PT_FD) */
	retval = (long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: flags (type: PT_FLAGS16) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, eventfd2_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_shutdown_e(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: how (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	res = val_to_ring(args, (unsigned long)shutdown_how_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_futex_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * op
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, (unsigned long)futex_op_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/*
	 * val
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_lseek_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd;
	int res;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * offset
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * whence
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, lseek_whence_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_llseek_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	unsigned long oh;
	unsigned long ol;
	uint64_t offset;
	int32_t fd;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * offset
	 * We build it by combining the offset_high and offset_low system call arguments
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &oh);
	syscall_get_arguments_deprecated(args, 2, 1, &ol);
	offset = (((uint64_t)oh) << 32) + ((uint64_t)ol);
	res = val_to_ring(args, offset, 0, false, 0);
	CHECK_RES(res);

	/*
	 * whence
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	res = val_to_ring(args, lseek_whence_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

static int poll_parse_fds(struct event_filler_arguments *args, bool enter_event)
{
	struct pollfd *fds;
	char *targetbuf;
	unsigned long val;
	unsigned long nfds;
	unsigned long fds_count;
	uint32_t j;
	uint32_t pos;
	uint16_t flags;

	/*
	 * fds
	 *
	 * Get the number of fds
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &nfds);

	/*
	 * Check if we have enough space to store both the fd list
	 * from user space and the temporary buffer to serialize to the ring
	 */
	if (unlikely(sizeof(struct pollfd) * nfds + 2 + 10 * nfds > STR_STORAGE_SIZE))
		return PPM_FAILURE_BUFFER_FULL;

	/* Get the fds pointer */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	fds = (struct pollfd *)args->str_storage;

	/* We don't want to discard the whole event if the pointer is null.
	 * Setting `nfds = 0` we will just push to userspace the number of fds read,
	 * in this case `0`.
	 */
#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		if (unlikely(ppm_copy_from_user(fds, (const void __user *)val, nfds * sizeof(struct pollfd))))
			nfds = 0;
#ifdef CONFIG_COMPAT
	} else {
		if (unlikely(ppm_copy_from_user(fds, (const void __user *)compat_ptr(val), nfds * sizeof(struct pollfd))))
			nfds = 0;
	}
#endif

	pos = 2;
	targetbuf = args->str_storage + nfds * sizeof(struct pollfd);
	fds_count = 0;

	/* Copy each fd into the temporary buffer */
	for (j = 0; j < nfds; j++) {
		if (enter_event) {
			flags = poll_events_to_scap(fds[j].events);
		} else {
			/*
			 * If it's an exit event, we copy only the fds that
			 * returned something
			 */
			if (!fds[j].revents)
				continue;

			flags = poll_events_to_scap(fds[j].revents);
		}

		*(int64_t *)(targetbuf + pos) = (int64_t)fds[j].fd;
		*(int16_t *)(targetbuf + pos + 8) = flags;
		pos += 10;
		++fds_count;
	}

	*(uint16_t *)(targetbuf) = (uint16_t)fds_count;

	return val_to_ring(args, (uint64_t)(unsigned long)targetbuf, pos, false, 0);
}

int f_sys_poll_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	res = poll_parse_fds(args, true);
	CHECK_RES(res);

	/*
	 * timeout
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

static int timespec_parse(struct event_filler_arguments *args, unsigned long val)
{
	uint64_t longtime = 0;
	int cfulen = 0;
	char *targetbuf = args->str_storage;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
	struct __kernel_timespec* tts = (struct __kernel_timespec *)targetbuf;
#else
	struct timespec *tts = (struct timespec *)targetbuf;
#endif

#ifdef CONFIG_COMPAT
	struct compat_timespec *compat_tts = (struct compat_timespec *)targetbuf;
#endif

	/*
	 * interval
	 * We copy the timespec structure and then convert it to a 64bit relative time
	 */
#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		cfulen = (int)ppm_copy_from_user(targetbuf, (void __user *)val, sizeof(*tts));
		if(likely(cfulen == 0))
		{
			longtime = ((uint64_t)tts->tv_sec) * 1000000000 + tts->tv_nsec;
		}
#ifdef CONFIG_COMPAT
	} else {
		cfulen = (int)ppm_copy_from_user(targetbuf, (void __user *)compat_ptr(val), sizeof(struct compat_timespec));
		if(likely(cfulen == 0))
		{
			longtime = ((uint64_t)compat_tts->tv_sec) * 1000000000 + compat_tts->tv_nsec;
		}
	}
#endif

	return val_to_ring(args, longtime, 0, false, 0);
}

int f_sys_ppoll_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;

	/* Parameter 1: fds (type: PT_FDLIST) */
	res = poll_parse_fds(args, true);
	CHECK_RES(res);

	/* Parameter 2: timeout (type: PT_RELTIME) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = timespec_parse(args, val);
	CHECK_RES(res);

	/* Parameter 3: sigmask (type: PT_SIGSET) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	if (val == (unsigned long)NULL || ppm_copy_from_user(&val, (void __user *)val, sizeof(val)))
	{
		val = 0;
	}
	res = val_to_ring(args, (uint32_t)val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

/* This is the same for poll() and ppoll() */
int f_sys_poll_x(struct event_filler_arguments *args)
{
	int64_t retval;
	int res;

	/*
	 * res
	 */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	res = poll_parse_fds(args, false);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mount_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/*
	 * Fix mount flags in arg 3.
	 * See http://lxr.free-electrons.com/source/fs/namespace.c?v=4.2#L2650
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	if ((val & PPM_MS_MGC_MSK) == PPM_MS_MGC_VAL)
		val &= ~PPM_MS_MGC_MSK;
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_openat_e(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long flags;
	unsigned long modes;
	int32_t fd;
	char *name = NULL;
	int res;

	/*
	 * dirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	if(likely(ppm_strncpy_from_user(args->str_storage, (const void __user *)val, PPM_MAX_PATH_SIZE) >= 0))
	{
		name = args->str_storage;
		name[PPM_MAX_PATH_SIZE - 1] = '\0';
	}
	res = val_to_ring(args, (int64_t)(long)name, 0, false, 0);
	CHECK_RES(res);
	/*
	 * Flags
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &flags);
	res = val_to_ring(args, open_flags_to_scap(flags), 0, false, 0);
	CHECK_RES(res);

	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(flags, modes), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_openat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long flags;
	unsigned long scap_flags;
	unsigned long modes;

	uint32_t dev = 0;
	uint64_t ino = 0;
	int res;
	int32_t fd;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * dirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * Flags
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &flags);
	scap_flags = open_flags_to_scap(flags);	
	/* update scap flags if file is created */
	get_fd_fmode_created(retval, &scap_flags);
	res = val_to_ring(args, scap_flags, 0, false, 0);
	CHECK_RES(res);
	/*
	 *  mode
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &modes);
	res = val_to_ring(args, open_modes_to_scap(flags, modes), 0, false, 0);
	CHECK_RES(res);
	get_fd_dev_ino(retval, &dev, &ino);

	/*
	 *  dev
	 */
	res = val_to_ring(args, dev, 0, false, 0);
	CHECK_RES(res);
	/*
	 *  ino
	 */
	res = val_to_ring(args, ino, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_unlinkat_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	long retval = 0;
	int32_t dirfd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	dirfd = (int32_t)val;
	if(dirfd == AT_FDCWD)
	{
		dirfd = PPM_AT_FDCWD;
	}
	res = val_to_ring(args, (int64_t)dirfd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: path (type: PT_FSRELPATH) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, unlinkat_flags_to_scap((int32_t) val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_linkat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long flags;
	int res;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * olddir
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	if ((int)val == AT_FDCWD)
		val = PPM_AT_FDCWD;

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldpath
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * newdir
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	if ((int)val == AT_FDCWD)
		val = PPM_AT_FDCWD;

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * newpath
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * Flags
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &flags);
	res = val_to_ring(args, linkat_flags_to_scap((int32_t) flags), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pread64_e(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long size;
	int res;
	unsigned long pos64;
	int32_t fd;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * size
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &size);
	res = val_to_ring(args, size, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pos
	 */
#ifndef CAPTURE_64BIT_ARGS_SINGLE_REGISTER
{
	unsigned long pos0;
	unsigned long pos1;
#if defined CONFIG_X86
	syscall_get_arguments_deprecated(args, 3, 1, &pos0);
	syscall_get_arguments_deprecated(args, 4, 1, &pos1);
#elif defined CONFIG_ARM && CONFIG_AEABI
	syscall_get_arguments_deprecated(args, 4, 1, &pos0);
	syscall_get_arguments_deprecated(args, 5, 1, &pos1);
#else
 #error This architecture/abi not yet supported
#endif

	pos64 = merge_64(pos1, pos0);
}
#else 
	syscall_get_arguments_deprecated(args, 3, 1, &pos64);
#endif

	res = val_to_ring(args, pos64, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pwrite64_e(struct event_filler_arguments *args)
{
	unsigned long val;
	unsigned long size;
	int res;
	unsigned long pos64;
	int32_t fd = 0;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * size
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &size);
	res = val_to_ring(args, size, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: pos (type: PT_UINT64) */
#ifndef CAPTURE_64BIT_ARGS_SINGLE_REGISTER
	{
		unsigned long pos0 = 0;
		unsigned long pos1 = 0;
#if defined CONFIG_X86
		syscall_get_arguments_deprecated(args, 3, 1, &pos0);
		syscall_get_arguments_deprecated(args, 4, 1, &pos1);
#elif defined CONFIG_ARM && CONFIG_AEABI
		syscall_get_arguments_deprecated(args, 4, 1, &pos0);
		syscall_get_arguments_deprecated(args, 5, 1, &pos1);
#else
  		#error This architecture/abi not yet supported
#endif
		pos64 = merge_64(pos1, pos0);
	}
#else
	syscall_get_arguments_deprecated(args, 3, 1, &pos64);
#endif /* CAPTURE_64BIT_ARGS_SINGLE_REGISTER*/

	res = val_to_ring(args, pos64, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_preadv_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	unsigned long pos64;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pos
	 */
#ifndef CAPTURE_64BIT_ARGS_SINGLE_REGISTER
	{
		unsigned long pos0;
		unsigned long pos1;
		/*
		* Note that in preadv and pwritev have NO 64-bit arguments in the
		* syscall (despite having one in the userspace API), so no alignment
		* requirements apply here. For an overly-detailed discussion about
		* this, see https://lwn.net/Articles/311630/
		*/
		syscall_get_arguments_deprecated(args, 3, 1, &pos0);
		syscall_get_arguments_deprecated(args, 4, 1, &pos1);

		pos64 = merge_64(pos1, pos0);
	}
#else
	syscall_get_arguments_deprecated(args, 3, 1, &pos64);
#endif

	res = val_to_ring(args, pos64, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_readv_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd;
	int res;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_readv_preadv_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int64_t retval;
	int res;
	unsigned long iovcnt;

	/*
	 * res
	 */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	if(retval > 0)
	{
		syscall_get_arguments_deprecated(args, 1, 1, &val);
		syscall_get_arguments_deprecated(args, 2, 1, &iovcnt);

	#ifdef CONFIG_COMPAT
		if (unlikely(args->compat)) {
			const struct compat_iovec __user *compat_iov = (const struct compat_iovec __user *)compat_ptr(val);
			res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt, retval, PRB_FLAG_PUSH_ALL);
		} else
	#endif
		{
			const struct iovec __user *iov = (const struct iovec __user *)val;
			res = parse_readv_writev_bufs(args, iov, iovcnt, retval, PRB_FLAG_PUSH_ALL);
		}

		CHECK_RES(res);
	} 
	else 
	{
		/* pushing a zero size */
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);

		/* pushing empty data */
		res = push_empty_param(args);
		CHECK_RES(res);
	}

	return add_sentinel(args);
}

int f_sys_writev_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd = 0;
	unsigned long iovcnt;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: size (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &iovcnt);

	/*
	 * Copy the buffer
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
#ifdef CONFIG_COMPAT
	if (unlikely(args->compat)) {
		const struct compat_iovec __user *compat_iov = (const struct compat_iovec __user *)compat_ptr(val);
		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt,
											args->consumer->snaplen,
											PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);
	} else
#endif
	{
		const struct iovec __user *iov = (const struct iovec __user *)val;
		res = parse_readv_writev_bufs(args, iov, iovcnt, args->consumer->snaplen,
									  PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);
	}

	/* if there was an error we send a size equal to `0`.
	 * we can improve this in the future but at least we don't lose the whole event.
	 */
	if(res == PPM_FAILURE_INVALID_USER_MEMORY)
	{
		res = val_to_ring(args, 0, 0, true, 0);
	}

	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_writev_pwritev_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	unsigned long iovcnt;

	/*
	 * res
	 */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * data and size
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &iovcnt);


	/*
	 * Copy the buffer
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
#ifdef CONFIG_COMPAT
	if (unlikely(args->compat)) {
		const struct compat_iovec __user *compat_iov = (const struct compat_iovec __user *)compat_ptr(val);
		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_DATA | PRB_FLAG_IS_WRITE);
	} else
#endif
	{
		const struct iovec __user *iov = (const struct iovec __user *)val;
		res = parse_readv_writev_bufs(args, iov, iovcnt, args->consumer->snaplen, PRB_FLAG_PUSH_DATA | PRB_FLAG_IS_WRITE);
	}

	/* if there was an error we send an empty param.
	 * we can improve this in the future but at least we don't lose the whole event.
	 */
	if(res == PPM_FAILURE_INVALID_USER_MEMORY)
	{
		res = push_empty_param(args);
	}

	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pwritev_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	unsigned long pos64;
	int32_t fd = 0;
	unsigned long iovcnt;

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * size
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &iovcnt);

	/*
	 * Copy the buffer
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
#ifdef CONFIG_COMPAT
	if (unlikely(args->compat))
	{
		const struct compat_iovec __user *compat_iov = (const struct compat_iovec __user *)compat_ptr(val);
		res = compat_parse_readv_writev_bufs(args, compat_iov, iovcnt,
									args->consumer->snaplen,
									PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);
	} else
#endif
	{
		const struct iovec __user *iov = (const struct iovec __user *)val;
		res = parse_readv_writev_bufs(args, iov, iovcnt, args->consumer->snaplen,
									  PRB_FLAG_PUSH_SIZE | PRB_FLAG_IS_WRITE);
	}

	/* if there was an error we send a size equal to 0.
	 * we can improve this in the future but at least we don't lose the whole event.
	 */
	if(res == PPM_FAILURE_INVALID_USER_MEMORY)
	{
		res = val_to_ring(args, 0, 0, true, 0);
	}

	CHECK_RES(res);

	/* Parameter 3: pos (type: PT_UINT64) */
#ifndef CAPTURE_64BIT_ARGS_SINGLE_REGISTER
	{
		unsigned long pos0 = 0;
		unsigned long pos1 = 0;
		/*
		* Note that in preadv and pwritev have NO 64-bit arguments in the
		* syscall (despite having one in the userspace API), so no alignment
		* requirements apply here. For an overly-detailed discussion about
		* this, see https://lwn.net/Articles/311630/
		*/
		syscall_get_arguments_deprecated(args, 3, 1, &pos0);
		syscall_get_arguments_deprecated(args, 4, 1, &pos1);

		pos64 = merge_64(pos1, pos0);
	}
#else
	syscall_get_arguments_deprecated(args, 3, 1, &pos64);
#endif /* CAPTURE_64BIT_ARGS_SINGLE_REGISTER */

	res = val_to_ring(args, pos64, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_nanosleep_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = timespec_parse(args, val);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getrlimit_setrlimit_e(struct event_filler_arguments *args)
{
	uint8_t ppm_resource;
	unsigned long val;
	int res;

	/*
	 * resource
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	ppm_resource = rlimit_resource_to_scap((uint32_t)val);

	res = val_to_ring(args, (uint64_t)ppm_resource, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getrlimit_x(struct event_filler_arguments *args) {
	unsigned long val;
	int res;
	int64_t retval;
	struct rlimit rl = {0};
#ifdef CONFIG_COMPAT
	struct compat_rlimit compat_rl = {0};
#endif
	int64_t cur;
	int64_t max;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Copy the user structure and extract cur and max
	 */
	if(retval == 0)
	{	
		syscall_get_arguments_deprecated(args, 1, 1, &val);

#ifdef CONFIG_COMPAT
		if(!args->compat)
		{
#endif
			if(unlikely(ppm_copy_from_user(&rl, (const void __user *)val, sizeof(struct rlimit))))
			{
				cur = 0;
				max = 0;
			}
			else
			{
				cur = rl.rlim_cur;
				max = rl.rlim_max;
			}
#ifdef CONFIG_COMPAT
		}
		else
		{
			if(unlikely(ppm_copy_from_user(&compat_rl, (const void __user *)compat_ptr(val), sizeof(struct compat_rlimit))))
			{
				cur = 0;
				max = 0;
			}
			else
			{
				cur = compat_rl.rlim_cur;
				max = compat_rl.rlim_max;
			}
		}
#endif
	}
	else
	{
		cur = -1;
		max = -1;
	}

	/* Parameter 2: cur (type: PT_INT64) */
	res = val_to_ring(args, cur, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: max (type: PT_INT64)*/
	res = val_to_ring(args, max, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_setrlimit_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
#ifdef CONFIG_COMPAT
	struct compat_rlimit compat_rl = {0};
#endif
	int64_t cur;
	int64_t max;
	struct rlimit rl = {0};

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Copy the user structure and extract cur and max
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		ppm_copy_from_user(&rl, (const void __user *)val, sizeof(struct rlimit));    
		cur = rl.rlim_cur;
		max = rl.rlim_max;
#ifdef CONFIG_COMPAT
	} else {
		ppm_copy_from_user(&compat_rl, (const void __user *)compat_ptr(val), sizeof(struct compat_rlimit));
		cur = compat_rl.rlim_cur;
		max = compat_rl.rlim_max;
	}
#endif

	/* Parameter 2: cur (type: PT_INT64) */
	res = val_to_ring(args, cur, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: max (type: PT_INT64) */
	res = val_to_ring(args, max, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: resource (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, rlimit_resource_to_scap((uint32_t)val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_prlimit_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	pid_t pid = 0;

	/* Parameter 1: pid (type: PT_PID) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	pid = (int32_t)val;
	res = val_to_ring(args, (int64_t)pid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: resource (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, rlimit_resource_to_scap((uint32_t)val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_prlimit_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	struct rlimit rl = {0};
#ifdef CONFIG_COMPAT
	struct compat_rlimit compat_rl = {0};
#endif
	int64_t newcur;
	int64_t newmax;
	int64_t oldcur;
	int64_t oldmax;
	pid_t pid = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Copy the user structure and extract cur and max
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		ppm_copy_from_user(&rl, (const void __user *)val, sizeof(struct rlimit));
		newcur = rl.rlim_cur;
		newmax = rl.rlim_max;
#ifdef CONFIG_COMPAT
	} else {
		ppm_copy_from_user(&compat_rl, (const void __user *)val, sizeof(struct compat_rlimit));
		newcur = compat_rl.rlim_cur;
		newmax = compat_rl.rlim_max;
	}
#endif

	/* Parameter 2: newcur (type: PT_INT64) */
	res = val_to_ring(args, newcur, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: newmax (type: PT_INT64) */
	res = val_to_ring(args, newmax, 0, false, 0);
	CHECK_RES(res);

	if(retval == 0)
	{
		syscall_get_arguments_deprecated(args, 3, 1, &val);

#ifdef CONFIG_COMPAT
		if (!args->compat) {
#endif
			if (unlikely(ppm_copy_from_user(&rl, (const void __user *)val, sizeof(struct rlimit))))
			{
				oldcur = 0;
				oldmax = 0;
			}
			else
			{
				oldcur = rl.rlim_cur;
				oldmax = rl.rlim_max;
			}
#ifdef CONFIG_COMPAT
		}
		else
		{
			if (unlikely(ppm_copy_from_user(&compat_rl, (const void __user *)val, sizeof(struct compat_rlimit))))
			{
				oldcur = 0;
				oldmax = 0;
			}
			else
			{
				oldcur = compat_rl.rlim_cur;
				oldmax = compat_rl.rlim_max;
			}
		}
#endif
	}
	else
	{
		oldcur = -1;
		oldmax = -1;	
	}

	/* Parameter 4: oldcur (type: PT_INT64) */
	res = val_to_ring(args, oldcur, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: oldmax (type: PT_INT64) */
	res = val_to_ring(args, oldmax, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 6: pid (type: PT_PID) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	pid = (s32)val;
	res = val_to_ring(args, (s64)pid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 7: resource (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, rlimit_resource_to_scap((uint32_t)val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

#ifdef CAPTURE_CONTEXT_SWITCHES

int f_sched_switch_e(struct event_filler_arguments *args)
{
	int res;
	long total_vm = 0;
	long total_rss = 0;
	long swap = 0;
	struct mm_struct *mm = NULL;

	if (args->sched_prev == NULL || args->sched_next == NULL) {
		ASSERT(false);
		return -1;
	}

	/*
	 * next
	 */
	res = val_to_ring(args, args->sched_next->pid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pgft_maj
	 */
	res = val_to_ring(args, args->sched_prev->maj_flt, 0, false, 0);
	CHECK_RES(res);

	/*
	 * pgft_min
	 */
	res = val_to_ring(args, args->sched_prev->min_flt, 0, false, 0);
	CHECK_RES(res);

	mm = args->sched_prev->mm;
	if (mm) {
		total_vm = mm->total_vm << (PAGE_SHIFT-10);
		total_rss = ppm_get_mm_rss(mm) << (PAGE_SHIFT-10);
		swap = ppm_get_mm_swap(mm) << (PAGE_SHIFT-10);
	}

	/*
	 * vm_size
	 */
	res = val_to_ring(args, total_vm, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_rss
	 */
	res = val_to_ring(args, total_rss, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_swap
	 */
	res = val_to_ring(args, swap, 0, false, 0);
	CHECK_RES(res);

#if 0
	/*
	 * steal
	 */
	steal = cputime64_to_clock_t(kcpustat_this_cpu->cpustat[CPUTIME_STEAL]);
	res = val_to_ring(args, steal, 0, false);
	CHECK_RES(res);
#endif

	return add_sentinel(args);
}
#endif /* CAPTURE_CONTEXT_SWITCHES */

int f_sched_drop(struct event_filler_arguments *args)
{
	int res;

	/*
	 * ratio
	 */
	res = val_to_ring(args, args->consumer->sampling_ratio, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fcntl_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: cmd (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, fcntl_cmd_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fcntl_x(struct event_filler_arguments *args)
{
	int64_t retval;
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: return value */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: cmd (type: PT_ENUMFLAGS8) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, fcntl_cmd_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

static inline int parse_ptrace_addr(struct event_filler_arguments *args, uint16_t request)
{
	unsigned long val;
	uint64_t dst;
	uint8_t idx;

	syscall_get_arguments_deprecated(args, 2, 1, &val);
	switch (request) {
	default:
		idx = PPM_PTRACE_IDX_UINT64;
		dst = (uint64_t)val;
	}

	return val_to_ring(args, dst, 0, false, idx);
}

static inline int parse_ptrace_data(struct event_filler_arguments *args, uint16_t request)
{
	unsigned long val;
	unsigned long len;
	uint64_t dst;
	uint8_t idx;

	syscall_get_arguments_deprecated(args, 3, 1, &val);
	switch (request) {
	case PPM_PTRACE_PEEKTEXT:
	case PPM_PTRACE_PEEKDATA:
	case PPM_PTRACE_PEEKUSR:
		idx = PPM_PTRACE_IDX_UINT64;
#ifdef CONFIG_COMPAT
		if (!args->compat) {
#endif
			len = ppm_copy_from_user(&dst, (const void __user *)val, sizeof(long));
#ifdef CONFIG_COMPAT
		} else {
			len = ppm_copy_from_user(&dst, (const void __user *)compat_ptr(val), sizeof(compat_long_t));
		}
#endif
		if (unlikely(len != 0))
			return PPM_FAILURE_INVALID_USER_MEMORY;

		break;
	case PPM_PTRACE_CONT:
	case PPM_PTRACE_SINGLESTEP:
	case PPM_PTRACE_DETACH:
	case PPM_PTRACE_SYSCALL:
		idx = PPM_PTRACE_IDX_SIGTYPE;
		dst = (uint64_t)val;
		break;
	case PPM_PTRACE_ATTACH:
	case PPM_PTRACE_TRACEME:
	case PPM_PTRACE_POKETEXT:
	case PPM_PTRACE_POKEDATA:
	case PPM_PTRACE_POKEUSR:
	default:
		idx = PPM_PTRACE_IDX_UINT64;
		dst = (uint64_t)val;
		break;
	}

	return val_to_ring(args, dst, 0, false, idx);
}

int f_sys_ptrace_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	pid_t pid = 0;

	/* Parameter 1: request (type: PT_FLAGS16) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, ptrace_requests_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: pid (type: PT_PID) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	pid = (int32_t)val;
	res = val_to_ring(args, (int64_t)pid, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_ptrace_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int64_t retval;
	uint16_t request;
	int res;

	/*
	 * res
	 */
	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	if (retval < 0) {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);

		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);

		return add_sentinel(args);
	}

	/*
	 * request
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	request = ptrace_requests_to_scap(val);

	res = parse_ptrace_addr(args, request);
	CHECK_RES(res);

	res = parse_ptrace_data(args, request);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_brk_munmap_mmap_x(struct event_filler_arguments *args)
{
	int64_t retval;
	int res = 0;
	struct mm_struct *mm = current->mm;
	long total_vm = 0;
	long total_rss = 0;
	long swap = 0;

	retval = (int64_t)(long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	if (mm) {
		total_vm = mm->total_vm << (PAGE_SHIFT-10);
		total_rss = ppm_get_mm_rss(mm) << (PAGE_SHIFT-10);
		swap = ppm_get_mm_swap(mm) << (PAGE_SHIFT-10);
	}

	/*
	 * vm_size
	 */
	res = val_to_ring(args, total_vm, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_rss
	 */
	res = val_to_ring(args, total_rss, 0, false, 0);
	CHECK_RES(res);

	/*
	 * vm_swap
	 */
	res = val_to_ring(args, swap, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mmap_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd = 0;
	int res;

	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * length
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * prot
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, prot_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, mmap_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/*
	 * fd
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * offset/pgoffset
	 */
	syscall_get_arguments_deprecated(args, 5, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mprotect_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * length
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * prot
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, prot_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mprotect_x(struct event_filler_arguments *args)
{
	int res;
	int64_t retval;
	
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	
	return add_sentinel(args);
}

int f_sys_renameat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * olddirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldpath
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * newdirfd
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * newpath
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_renameat2_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * olddirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldpath
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * newdirfd
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * newpath
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);


	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_symlinkat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldpath
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * newdirfd
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * newpath
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_openat2_e(struct event_filler_arguments *args)
{
	unsigned long resolve;
	unsigned long flags;
	unsigned long val;
	unsigned long mode;
	char *name = NULL;
	int32_t fd;
	int res;
#ifdef __NR_openat2
	struct open_how how;
#endif

	/*
	 * dirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	if(likely(ppm_strncpy_from_user(args->str_storage, (const void __user *)val, PPM_MAX_PATH_SIZE) >= 0))
	{
		name = args->str_storage;
		name[PPM_MAX_PATH_SIZE - 1] = '\0';
	}
	res = val_to_ring(args, (int64_t)(long)name, 0, false, 0);
	CHECK_RES(res);
	

#ifdef __NR_openat2
	/*
	 * how: we get the data structure, and put its fields in the buffer one by one
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = ppm_copy_from_user(&how, (void *)val, sizeof(struct open_how));
	if (unlikely(res != 0))
		return PPM_FAILURE_INVALID_USER_MEMORY;

	flags = open_flags_to_scap(how.flags);
	mode = open_modes_to_scap(how.flags, how.mode);
	resolve = openat2_resolve_to_scap(how.resolve);
#else
	flags = 0;
	mode = 0;
	resolve = 0;
#endif
	/*
	 * flags (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	res = val_to_ring(args, flags, 0, true, 0);
	CHECK_RES(res);

	/*
	 * mode (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	res = val_to_ring(args, mode, 0, true, 0);
	CHECK_RES(res);

	/*
	 * resolve (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	res = val_to_ring(args, resolve, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_openat2_x(struct event_filler_arguments *args)
{
	unsigned long resolve;
	unsigned long flags;
	unsigned long val;
	unsigned long mode;
	int res;
	int32_t fd;
	int64_t retval;
#ifdef __NR_openat2
	struct open_how how;
#endif

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * dirfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/*
	 * name
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	

#ifdef __NR_openat2
	/*
	 * how: we get the data structure, and put its fields in the buffer one by one
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = ppm_copy_from_user(&how, (void *)val, sizeof(struct open_how));
	if (unlikely(res != 0))
		return PPM_FAILURE_INVALID_USER_MEMORY;

	flags = open_flags_to_scap(how.flags);
	mode = open_modes_to_scap(how.flags, how.mode);
	resolve = openat2_resolve_to_scap(how.resolve);
#else
	flags = 0;
	mode = 0;
	resolve = 0;
#endif
	/*
	 * flags (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */	
	/* update flags if file is created */
	get_fd_fmode_created(retval, &flags);
	res = val_to_ring(args, flags, 0, true, 0);
	CHECK_RES(res);

	/*
	 * mode (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	res = val_to_ring(args, mode, 0, true, 0);
	CHECK_RES(res);

	/*
	 * resolve (extracted from open_how structure)
	 * Note that we convert them into the ppm portable representation before pushing them to the ring
	 */
	res = val_to_ring(args, resolve, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_copy_file_range_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int32_t fdin = 0;
	unsigned long offin = 0;
	unsigned long len = 0;
	int res = 0;

	/* Parameter 1: fdin (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fdin = (int32_t)val;
	res = val_to_ring(args, (int64_t)fdin, 0, false, 0);
	CHECK_RES(res);

	/*
	* offin
	*/
	syscall_get_arguments_deprecated(args, 1, 1, &offin);
	res = val_to_ring(args, offin, 0, false, 0);
	CHECK_RES(res);

	/*
	* len
	*/
	syscall_get_arguments_deprecated(args, 4, 1, &len);
	res = val_to_ring(args, len, 0, false, 0);
	CHECK_RES(res);
	
	return add_sentinel(args);
}

int f_sys_copy_file_range_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	unsigned long offout = 0;
	int64_t retval = 0;
	int res = 0;
	int32_t fdout = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fdout (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	fdout = (int32_t)val;
	res = val_to_ring(args, (int64_t)fdout, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: offout (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 3, 1, &offout);
	res = val_to_ring(args, offout, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_open_by_handle_at_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	unsigned long flags = 0;
	int res = 0;
	long retval = 0;
	char *pathname = NULL;
	int32_t mountfd = 0;

	/* Parameter 1: ret (type: PT_FD) */
	retval = syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: mountfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	mountfd = (int32_t)val;
	if(mountfd == AT_FDCWD)
	{
		mountfd = PPM_AT_FDCWD;
	}
	res = val_to_ring(args, (int64_t)mountfd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	flags = open_flags_to_scap(val);
	/* update flags if file is created */
	get_fd_fmode_created(retval, &flags);
	res = val_to_ring(args, flags, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: path (type: PT_FSPATH) */
	if (retval > 0)
	{
		/* String storage size is exactly one page. 
		 * PAGE_SIZE = 4096 byte like PATH_MAX in unix conventions.
		 */
		char* buf = (char*)args->str_storage;

		struct file *file;
		file = fget(retval);
		if(likely(file))
		{
			/* `pathname` will be a pointer inside the buffer `buf`
		 	 * where the file path effectively starts.
		 	 */
			pathname = d_path(&file->f_path, buf, PAGE_SIZE);
			fput(file);
		}
	}

	res = val_to_ring(args, (unsigned long)pathname, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_io_uring_setup_x(struct event_filler_arguments *args)
{
	int res = 0;
	long retval = 0;
	unsigned long val = 0;

	/* All these params are sent equal to `0` if `__NR_io_uring_setup`
	 * syscall is not defined.
	 */
	uint32_t sq_entries = 0;
	uint32_t cq_entries = 0;
	uint32_t flags = 0;
	uint32_t sq_thread_cpu = 0;
	uint32_t sq_thread_idle = 0;
	uint32_t features = 0;

#ifdef __NR_io_uring_setup
	struct io_uring_params params = {0};
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = ppm_copy_from_user(&params, (void *)val, sizeof(struct io_uring_params));
	if(unlikely(res != 0))
	{
		memset(&params, 0, sizeof(params));
	}

	sq_entries = params.sq_entries;
	cq_entries = params.cq_entries;
	flags = io_uring_setup_flags_to_scap(params.flags);
	sq_thread_cpu = params.sq_thread_cpu;
	sq_thread_idle = params.sq_thread_idle;
	
	/* We need this ifdef because `features` field is defined into the 
	 * `struct io_uring_params` only if the `IORING_FEAT_SINGLE_MMAP` is
	 * defined.
	 */	
#ifdef IORING_FEAT_SINGLE_MMAP
	features = io_uring_setup_feats_to_scap(params.features);
#endif
#endif /* __NR_io_uring_setup */

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	
	/* Parameter 2: entries (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: sq_entries (type: PT_UINT32) */
	res = val_to_ring(args, sq_entries, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: cq_entries (type: PT_UINT32) */
	res = val_to_ring(args, cq_entries, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 5: flags (type: PT_FLAGS32) */
	res = val_to_ring(args, flags, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 6: sq_thread_cpu (type: PT_UINT32) */
	res = val_to_ring(args, sq_thread_cpu, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 7: sq_thread_idle (type: PT_UINT32) */
	res = val_to_ring(args, sq_thread_idle, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 8: features (type: PT_FLAGS32) */
	res = val_to_ring(args, features, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_io_uring_enter_x(struct event_filler_arguments *args)
{
	int res = 0;
	int32_t fd = 0;
	unsigned long val = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	long retval = (long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: to_submit (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: min_complete (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 5: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, io_uring_enter_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	/* Parameter 6: sig (type: PT_SIGSET) */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/// TODO: We miss the last parameter `size_t argsz`
	/// we need to implement it in all our drivers

	return add_sentinel(args);
}

int f_sys_io_uring_register_x (struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	int32_t fd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: opcode (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, io_uring_register_opcodes_to_scap(val) , 0 , true, 0);
	CHECK_RES(res);

	/* Parameter 4: arg (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 5: nr_args (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_inotify_init_e(struct event_filler_arguments *args)
{
	/* Parameter 1: flags (type: PT_FLAGS8) */
	/* We have nothing to extract from the kernel here so we send `0`.
	 * This is done to preserve the `PPME_SYSCALL_INOTIFY_INIT_E` event with 1 param.
	 */
	int res = val_to_ring(args, 0, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_inotify_init1_x(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: flags (type: PT_FLAGS16) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, inotify_init1_flags_to_scap((int32_t)val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mlock_x(struct event_filler_arguments *args)
{
	unsigned long val;

	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	/*
	 * len
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mlock2_x(struct event_filler_arguments *args)
{
	unsigned long val;

	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	/*
	 * len
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, mlock2_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_munlock_x(struct event_filler_arguments *args)
{
	unsigned long val;

	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	/*
	 * addr
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	/*
	 * len
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mlockall_x(struct event_filler_arguments *args)
{
	unsigned long val;

	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, mlockall_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_munlockall_x(struct event_filler_arguments *args)
{
	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fsconfig_x(struct event_filler_arguments *args)
{
	unsigned long res = 0;

	int64_t ret = 0;
	unsigned long val = 0;
	int32_t fd;
	unsigned long cmd = 0;
	unsigned long scap_cmd = 0;
	unsigned long key_pointer = 0;
	unsigned long value_pointer = 0;
	unsigned long aux = 0;

	/* Parameter 1: ret (type: PT_ERRNO) */
	ret = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, ret, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	/* This is the file-system fd */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: cmd (type: PT_ENUMFLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &cmd);
	scap_cmd = fsconfig_cmds_to_scap(cmd);
	res = val_to_ring(args, scap_cmd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: key (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 2, 1, &key_pointer);
	res = val_to_ring(args, key_pointer, 0, true, 0);
	CHECK_RES(res);

	syscall_get_arguments_deprecated(args, 4, 1, &aux);

	if(ret < 0)
	{
		/* If the syscall fails we push empty params to userspace. */

		/* Parameter 5: value_bytebuf (type: PT_BYTEBUF) */
		res = val_to_ring(args, 0, 0, true, 0);
		CHECK_RES(res);

		/* Parameter 6: value_charbuf (type: PT_CHARBUF) */
		res = val_to_ring(args, 0, 0, true, 0);
		CHECK_RES(res);
	}
	else
	{
		syscall_get_arguments_deprecated(args, 3, 1, &value_pointer);

		/* According to the command we need to understand what value we have to push to userspace. */
		/* see https://elixir.bootlin.com/linux/latest/source/fs/fsopen.c#L271 */
		switch(scap_cmd)
		{
		case PPM_FSCONFIG_SET_FLAG:
		case PPM_FSCONFIG_SET_FD:
		case PPM_FSCONFIG_CMD_CREATE:
		case PPM_FSCONFIG_CMD_RECONFIGURE:
			/* Since `value` is NULL we send two empty params. */

			/* Parameter 5: value_bytebuf (type: PT_BYTEBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);

			/* Parameter 6: value_charbuf (type: PT_CHARBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);
			break;

		case PPM_FSCONFIG_SET_STRING:
		case PPM_FSCONFIG_SET_PATH:
		case PPM_FSCONFIG_SET_PATH_EMPTY:
			/* `value` is a NUL-terminated string.
			 * Push `value_charbuf` but not `value_bytebuf` (empty).
			 */

			/* Parameter 5: value_bytebuf (type: PT_BYTEBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);

			/* Parameter 6: value_charbuf (type: PT_CHARBUF) */
			res = val_to_ring(args, value_pointer, 0, true, 0);
			CHECK_RES(res);
			break;

		case PPM_FSCONFIG_SET_BINARY:
			/* `value` points to a binary blob and `aux` indicates its size.
			 * Push `value_bytebuf` but not `value_charbuf` (empty).
			 */

			/* Parameter 5: value_bytebuf (type: PT_BYTEBUF) */
			res = val_to_ring(args, value_pointer, aux, true, 0);
			CHECK_RES(res);

			/* Parameter 6: value_charbuf (type: PT_CHARBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);
			break;

		default:

			/* Parameter 5: value_bytebuf (type: PT_BYTEBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);

			/* Parameter 6: value_charbuf (type: PT_CHARBUF) */
			res = val_to_ring(args, 0, 0, true, 0);
			CHECK_RES(res);
			break;
		}
	}

	/* Parameter 7: aux (type: PT_INT32) */
	res = val_to_ring(args, aux, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_signalfd_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: mask (type: PT_UINT32) */
	/* Right now we are not interested in the `sigmask`, we can populate it if we need */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: flags (type: PT_FLAGS8) */
	/* The syscall `signalfd` has no flags! only `signalfd4` has the `flags` param.
	 * For compatibility with the event definition here we send `0` as flags.
	 */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_signalfd4_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: mask (type: PT_UINT32) */
	/* Right now we are not interested in the `sigmask`, we can populate it if we need */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_signalfd4_x(struct event_filler_arguments *args)
{
	int res = 0;
	unsigned long val = 0;
	long retval = 0;

	/* Parameter 1: res (type: PT_FD) */
	retval = (long)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: flags (type: PT_FLAGS16) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, signalfd4_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_epoll_create_e(struct event_filler_arguments *args)
{
	unsigned long size;
	int res;

	/*
	 * size
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &size);
	res = val_to_ring(args, size, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_epoll_create_x(struct event_filler_arguments *args)
{
	int64_t retval;
	int res;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_epoll_create1_e(struct event_filler_arguments *args)
{
	unsigned long flags;
	int res;

	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &flags);
	res = val_to_ring(args, epoll_create1_flags_to_scap(flags), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_epoll_create1_x(struct event_filler_arguments *args)
{
	int64_t retval;
	int res;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;


	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup2_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup2_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;


	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);
	
	/*
	 * newfd
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup3_e(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_dup3_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val;

	int64_t retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * oldfd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);
	
	/*
	 * newfd
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/*
	 * flags
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, dup3_flags_to_scap((int) val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

/* Before kernel version 3.4.0 we dont' have the concept of
 * "sub_reaper", `prctl` wasn't defined so we can simply send -1
 * to userspace. It should be able through its logic to find the correct
 * reaper!
 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)

static pid_t find_alive_thread(struct task_struct *father)
{
	struct task_struct *t = father;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
	while_each_thread(father, t) {
#else /* Kernel 3.19.0 switched to `for_each_thread` macro */
	for_each_thread(father, t) {
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0) */		
		/* We add an extra check here for `t != NULL` just to be sure */
		if (t != NULL && (!(t->flags & PF_EXITING)))
			return t->pid;
	}
	return 0;
}

/* When we die, we re-parent all our children, and try to:
 * 1. give them to another thread in our thread group, if such a member exists
 * 2. give it to the first ancestor process which prctl'd itself as a
 *    child_subreaper for its children (like a service manager)
 * 3. give it to the init process (PID 1) in our pid namespace
 */
static pid_t find_new_reaper_pid(struct task_struct *father)
{
	struct task_struct *possible_reaper;
	/* This is the namespace level of the thread that is dying, we will
	 * use it to check that the reaper will be always in the same namespace.
	 */
	unsigned int father_ns_level = task_pid(father)->level;
	/* This is the reaper of that namespace */
	struct task_struct *child_ns_reaper = task_active_pid_ns(father)->child_reaper;
	/* Search an alive thread in the same thread group */
	pid_t reaper_pid = find_alive_thread(father);

	/* If `reaper_pid!=0` when we found an alive thread, that's enough */
	if(reaper_pid != 0)
	{
		return reaper_pid;
	}

	/* There could be a strange case in which the actual thread is the init one 
	 * and we have no other threads in the same thread group, so the whole init group is dying.
	 * The kernel will destroy all the processes in that namespace. We send a reaper equal to
	 * `0` in userspace.
	 */
	if(child_ns_reaper == father)
	{
		return 0;
	}

	/* If there are no sub reapers the reaper is the init process of that namespace */
	if(!father->signal->has_child_subreaper)
	{
		return child_ns_reaper->pid;
	}

	/* If we fall here it means we have some sub_reapers.
	 * Find the first ->is_child_subreaper ancestor in our pid_ns.
	 * We can't check reaper != child_reaper to ensure we do not
	 * cross the namespaces, the exiting parent could be injected
	 * by setns() + fork().
	 * We check pid->level, this is slightly more efficient than
	 * task_active_pid_ns(reaper) != task_active_pid_ns(father).
	 */
	for(possible_reaper = father->real_parent;
		task_pid(possible_reaper)->level == father_ns_level;
		possible_reaper = possible_reaper->real_parent)
	{
		/* Here we could also check for child_ns_reaper 
		 * but the kernel checks against init_task, so we are fine.
		 */
		if(possible_reaper == &init_task)
		{
			return child_ns_reaper->pid;
		}

		if(!possible_reaper->signal->is_child_subreaper)
		{
			continue;
		}

		reaper_pid = find_alive_thread(possible_reaper);
		if(reaper_pid != 0)
		{
			return reaper_pid;
		}
	}

	return child_ns_reaper->pid;
}
#else

static pid_t find_new_reaper_pid(struct task_struct *father)
{
	return -1;
}

#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0) */


int f_sys_procexit_e(struct event_filler_arguments *args)
{
	int res;

	pid_t reaper_pid = 0;

	if (args->sched_prev == NULL) {
		ASSERT(false);
		return -1;
	}

	/* Parameter 1: status (type: PT_ERRNO) */
	res = val_to_ring(args, args->sched_prev->exit_code, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: ret (type: PT_ERRNO) */
	res = val_to_ring(args, __WEXITSTATUS(args->sched_prev->exit_code), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: sig (type: PT_SIGTYPE) */
	/* If signaled -> signum, else 0 */
	if (__WIFSIGNALED(args->sched_prev->exit_code))
	{
		res = val_to_ring(args, __WTERMSIG(args->sched_prev->exit_code), 0, false, 0);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
	}
	CHECK_RES(res);

	/* Parameter 4: core (type: PT_UINT8) */
	res = val_to_ring(args, __WCOREDUMP(args->sched_prev->exit_code) != 0, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: reaper_tid (type: PT_PID) */
	/* This is a sort of optimization if this thread has no children in the kernel
	 * we don't need a reaper and we can save some precious cycles.
	 * We send `reaper_pid==0` if the userspace still has some children
	 * it will manage them with its userspace logic.
	 */	
	if(!list_empty(&current->children))
	{
		/* We have at least one child, so we need a reaper for it */
		reaper_pid = find_new_reaper_pid(current);
	}
	res = val_to_ring(args, (int64_t)reaper_pid, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_sendfile_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	off_t offset = 0;
	int32_t out_fd = 0;
	int32_t in_fd = 0;

	/* Parameter 1: out_fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	out_fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)out_fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 2: in_fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	in_fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)in_fd, 0, true, 0);
	CHECK_RES(res);


	/* Parameter 3: offset (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	if (val != 0) {
#ifdef CONFIG_COMPAT
		if (!args->compat) {
#endif
			res = ppm_copy_from_user(&offset, (void *)val, sizeof(off_t));
#ifdef CONFIG_COMPAT
		} else {
			res = ppm_copy_from_user(&offset, (void *)compat_ptr(val), sizeof(compat_off_t));
		}
#endif
		if (unlikely(res))
			val = 0;
		else
			val = offset;
	}

	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: size (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_sendfile_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	off_t offset;

	/*
	 * res
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * offset
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	if (val != 0) {
#ifdef CONFIG_COMPAT
		if (!args->compat) {
#endif
			res = ppm_copy_from_user(&offset, (void *)val, sizeof(off_t));
#ifdef CONFIG_COMPAT
		} else {
			res = ppm_copy_from_user(&offset, (void *)compat_ptr(val), sizeof(compat_off_t));
		}
#endif
		if (unlikely(res))
			val = 0;
		else
			val = offset;
	}

	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_quotactl_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	uint32_t id = 0;
	uint8_t quota_fmt = 0;
	uint32_t cmd = 0;
	uint16_t scap_cmd = 0;

	/* Parameter 1: cmd (type: PT_FLAGS16) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	cmd = (uint32_t)val;
	scap_cmd = quotactl_cmd_to_scap(cmd);
	res = val_to_ring(args, scap_cmd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: type (type: PT_FLAGS8) */
	res = val_to_ring(args, quotactl_type_to_scap(cmd), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: id (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	id = (uint32_t)val;
	if ((scap_cmd != PPM_Q_GETQUOTA) &&
		 (scap_cmd != PPM_Q_SETQUOTA) &&
		 (scap_cmd != PPM_Q_XGETQUOTA) &&
		 (scap_cmd != PPM_Q_XSETQLIM))
	{
		/* In this case `id` don't represent a `userid` or a `groupid` */
		res = val_to_ring(args, 0, 0, false, 0);
	}
	else
	{
		res = val_to_ring(args, id, 0, false, 0);
	}
	CHECK_RES(res);

	/* Parameter 4: quota_fmt (type: PT_FLAGS8) */
	quota_fmt = PPM_QFMT_NOT_USED;
	if(scap_cmd == PPM_Q_QUOTAON)
	{
		quota_fmt = quotactl_fmt_to_scap(id);
	}
	res = val_to_ring(args, quota_fmt, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_quotactl_x(struct event_filler_arguments *args)
{
	unsigned long val, len;
	int res;
	int64_t retval;
	uint16_t cmd;
	struct if_dqblk dqblk;
	struct if_dqinfo dqinfo;
	uint32_t quota_fmt_out;

	/*
	 * extract cmd
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	cmd = quotactl_cmd_to_scap(val);

	/*
	 * return value
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * Add special
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * get addr
	 */
	syscall_get_arguments_deprecated(args, 3, 1, &val);

	/*
	 * get quotafilepath only for QUOTAON
	 */
	if (cmd == PPM_Q_QUOTAON)
		res = val_to_ring(args, val, 0, true, 0);
	else
		res = val_to_ring(args, 0, 0, false, 0);

	CHECK_RES(res);


	/*
	 * dqblk fields if present
	 */
	dqblk.dqb_valid = 0;
	if ((cmd == PPM_Q_GETQUOTA) || (cmd == PPM_Q_SETQUOTA)) {
		len = ppm_copy_from_user(&dqblk, (void *)val, sizeof(struct if_dqblk));
		if (unlikely(len != 0))
			return PPM_FAILURE_INVALID_USER_MEMORY;
	}
	if (dqblk.dqb_valid & QIF_BLIMITS) {
		res = val_to_ring(args, dqblk.dqb_bhardlimit, 0, false, 0);
		CHECK_RES(res);
		res = val_to_ring(args, dqblk.dqb_bsoftlimit, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqblk.dqb_valid & QIF_SPACE) {
		res = val_to_ring(args, dqblk.dqb_curspace, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqblk.dqb_valid & QIF_ILIMITS) {
		res = val_to_ring(args, dqblk.dqb_ihardlimit, 0, false, 0);
		CHECK_RES(res);
		res = val_to_ring(args, dqblk.dqb_isoftlimit, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqblk.dqb_valid & QIF_BTIME) {
		res = val_to_ring(args, dqblk.dqb_btime, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqblk.dqb_valid & QIF_ITIME) {
		res = val_to_ring(args, dqblk.dqb_itime, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	/*
	 * dqinfo fields if present
	 */
	dqinfo.dqi_valid = 0;
	if ((cmd == PPM_Q_GETINFO) || (cmd == PPM_Q_SETINFO)) {
		len = ppm_copy_from_user(&dqinfo, (void *)val, sizeof(struct if_dqinfo));
		if (unlikely(len != 0))
			return PPM_FAILURE_INVALID_USER_MEMORY;
	}

	if (dqinfo.dqi_valid & IIF_BGRACE) {
		res = val_to_ring(args, dqinfo.dqi_bgrace, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqinfo.dqi_valid & IIF_IGRACE) {
		res = val_to_ring(args, dqinfo.dqi_igrace, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	if (dqinfo.dqi_valid & IIF_FLAGS) {
		res = val_to_ring(args, dqinfo.dqi_flags, 0, false, 0);
		CHECK_RES(res);
	} else {
		res = val_to_ring(args, 0, 0, false, 0);
		CHECK_RES(res);
	}

	quota_fmt_out = PPM_QFMT_NOT_USED;
	if (cmd == PPM_Q_GETFMT) {
		len = ppm_copy_from_user(&quota_fmt_out, (void *)val, sizeof(uint32_t));
		if (unlikely(len != 0))
			return PPM_FAILURE_INVALID_USER_MEMORY;
		quota_fmt_out = quotactl_fmt_to_scap(quota_fmt_out);
	}
	res = val_to_ring(args, quota_fmt_out, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_scapevent_e(struct event_filler_arguments *args)
{
	int res;

	/*
	 * event_type
	 */
	res = val_to_ring(args, (unsigned long)args->sched_prev, 0, false, 0);
	CHECK_RES(res);

	/*
	 * event_data
	 */
	res = val_to_ring(args, (unsigned long)args->sched_next, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getresuid_and_gid_x(struct event_filler_arguments *args)
{
	int res;
	unsigned long val, len;
	uint32_t uid;
	int16_t retval;

	/*
	 * return value
	 */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * ruid
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
#ifdef CONFIG_COMPAT
	if (!args->compat) {
#endif
		len = ppm_copy_from_user(&uid, (void *)val, sizeof(uint32_t));
#ifdef CONFIG_COMPAT
	} else {
		len = ppm_copy_from_user(&uid, (void *)compat_ptr(val), sizeof(uint32_t));
	}
#endif
	if (unlikely(len != 0))
		return PPM_FAILURE_INVALID_USER_MEMORY;

	res = val_to_ring(args, uid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * euid
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	len = ppm_copy_from_user(&uid, (void *)val, sizeof(uint32_t));
	if (unlikely(len != 0))
		return PPM_FAILURE_INVALID_USER_MEMORY;

	res = val_to_ring(args, uid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * suid
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	len = ppm_copy_from_user(&uid, (void *)val, sizeof(uint32_t));
	if (unlikely(len != 0))
		return PPM_FAILURE_INVALID_USER_MEMORY;

	res = val_to_ring(args, uid, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_flock_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	uint32_t flags = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: operation (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	flags = flock_flags_to_scap((int) val);
	res = val_to_ring(args, flags, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_ioctl_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: request (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: argument (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mkdir_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;

	/* Parameter 1: mode (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_setns_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int32_t fd = 0;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 2: nstype (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, clone_flags_to_scap((int) val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_setpgid_e(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	pid_t pid = 0;
	pid_t pgid = 0;

	/* Parameter 1: pid (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	pid = (int32_t)val;
	res = val_to_ring(args, (int64_t)pid, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 2: pgid (type: PT_PID) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	pgid = (int32_t)val;
	res = val_to_ring(args, (int64_t)pgid, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_unshare_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	uint32_t flags;

	/*
	 * get type, parse as clone flags as it's a subset of it
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	flags = clone_flags_to_scap((int) val);
	res = val_to_ring(args, flags, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

#ifdef CAPTURE_SIGNAL_DELIVERIES
int f_sys_signaldeliver_e(struct event_filler_arguments *args)
{
	int res;

	/*
	 * source pid
	 */
	res = val_to_ring(args, args->spid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * destination pid
	 */
	res = val_to_ring(args, args->dpid, 0, false, 0);
	CHECK_RES(res);

	/*
	 * signal number
	 */
	res = val_to_ring(args, args->signo, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}
#endif

#ifdef CAPTURE_PAGE_FAULTS
int f_sys_pagefault_e(struct event_filler_arguments *args)
{
	int res;

	res = val_to_ring(args, args->fault_data.address, 0, false, 0);
	CHECK_RES(res);

	res = val_to_ring(args, args->fault_data.regs->ip, 0, false, 0);
	CHECK_RES(res);

	res = val_to_ring(args, pf_flags_to_scap(args->fault_data.error_code), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}
#endif

int f_cpu_hotplug_e(struct event_filler_arguments *args)
{
	int res;

	/*
	 * cpu
	 */
	res = val_to_ring(args, (uint64_t)args->sched_prev, 0, false, 0);
	CHECK_RES(res);

	/*
	 * action
	 */
	res = val_to_ring(args, (uint64_t)args->sched_next, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_semop_x(struct event_filler_arguments *args)
{
	unsigned long nsops = 0 ;
	int res = 0;
	long retval = 0;
	struct sembuf *sops_pointer = NULL;
	struct sembuf sops[2] = {0};

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: nsops (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &nsops);
	res = val_to_ring(args, nsops, 0, true, 0);
	CHECK_RES(res);

	/* Extract pointer to the `sembuf` struct */
	syscall_get_arguments_deprecated(args, 1, 1, (unsigned long *) &sops_pointer);

	if(retval != 0 || sops_pointer == 0 || nsops == 0)
	{
		/* We send all 0 when one of these is true:
		 * - the syscall fails (retval != 0)
		 * - `sops_pointer` is NULL
		 * - `nsops` is 0
		 */
	}
	else if(nsops == 1)
	{
		/* If we have just one entry the second will be empty, we don't fill it */
		if(unlikely(ppm_copy_from_user(sops, (void *)sops_pointer, sizeof(struct sembuf))))
		{
			memset(&sops, 0, sizeof(sops));
		}
	}
	else
	{
		/* If `nsops>1` we read just the first 2 entries. */
		if(unlikely(ppm_copy_from_user(sops, (void *)sops_pointer, 2 * sizeof(struct sembuf))))
		{
			memset(&sops, 0, sizeof(sops));
		}
	}

	/* Parameter 3: sem_num_0 (type: PT_UINT16) */
	res = val_to_ring(args, sops[0].sem_num, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: sem_op_0 (type: PT_INT16) */
	res = val_to_ring(args, sops[0].sem_op, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 5: sem_flg_0 (type: PT_FLAGS16) */
	res = val_to_ring(args, semop_flags_to_scap(sops[0].sem_flg), 0, true, 0);
	CHECK_RES(res);

	/* Parameter 6: sem_num_1 (type: PT_UINT16) */
	res = val_to_ring(args, sops[1].sem_num, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 7: sem_op_1 (type: PT_INT16) */
	res = val_to_ring(args, sops[1].sem_op, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 8: sem_flg_1 (type: PT_FLAGS16) */
	res = val_to_ring(args, semop_flags_to_scap(sops[1].sem_flg), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_semget_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/*
	 * key
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * nsems
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * semflg
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, semget_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_semctl_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/*
	 * semid
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * semnum
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * cmd
	 */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, semctl_cmd_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	/*
	 * optional argument semun/val
	 */
	if (val == SETVAL)
		syscall_get_arguments_deprecated(args, 3, 1, &val);
	else
		val = 0;
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_access_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/*
	 * mode
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, access_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fchdir_e(struct event_filler_arguments *args)
{
	int res = 0;
	int32_t fd = 0;
	unsigned long val = 0;

	/* Parameter 1: fd (type: PT_FD)*/
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_fchdir_x(struct event_filler_arguments *args)
{
	int64_t res = 0;

	/* Parameter 1: res (type: PT_ERRNO)*/
	res = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, res, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_close_e(struct event_filler_arguments *args)
{
	int res = 0;
	int32_t fd = 0;
	unsigned long val = 0;

	/* Parameter 1: fd (type: PT_FD)*/
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_close_x(struct event_filler_arguments *args)
{
	int64_t res = 0;

	/* Parameter 1: res (type: PT_ERRNO)*/
	res = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, res, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_bpf_e(struct event_filler_arguments *args)
{
	int res = 0;
	int32_t cmd = 0;
	unsigned long val = 0;
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	/* Parameter 1: cmd (type: PT_INT64) */
	cmd = (int32_t)val;
	res = val_to_ring(args, (int64_t)cmd, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_bpf_x(struct event_filler_arguments *args)
{
	int res = 0;
	int64_t fd = 0;
	unsigned long val = 0;
	int32_t cmd = 0;

	/* Parameter 1: fd (type: PT_DEC) */
	fd = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: cmd (type: PT_INT64) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	cmd = (int32_t)val;
	res = val_to_ring(args, cmd, 0, false, 0);
	CHECK_RES(res);
	return add_sentinel(args);
}

int f_sys_mkdirat_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int64_t retval = 0;
	int32_t dirfd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	dirfd = (int32_t)val;
	if(dirfd == AT_FDCWD)
	{
		dirfd = PPM_AT_FDCWD;
	}
	res = val_to_ring(args, (int64_t)dirfd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: path (type: PT_FSRELPATH) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: mode (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fchmodat_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int64_t retval = 0;
	int32_t dirfd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	dirfd = (int32_t)val;
	if(dirfd == AT_FDCWD)
	{
		dirfd = PPM_AT_FDCWD;
	}
	res = val_to_ring(args, (int64_t)dirfd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: filename (type: PT_FSRELPATH) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: mode (type: PT_MODE) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, chmod_mode_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_chmod_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * filename
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/*
	 * mode
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, chmod_mode_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fchmod_x(struct event_filler_arguments *args)
{
	unsigned long val = 0;
	int res = 0;
	int64_t retval = 0;
	int32_t fd = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: mode (type: PT_MODE) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, chmod_mode_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_chown_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;

	/* Parameter 1: res (type: PT_ERRNO)*/
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: path (type: PT_FSPATH) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: uid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: gid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_lchown_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;

	/* Parameter 1: res (type: PT_ERRNO)*/
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: path (type: PT_FSPATH) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);

	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: uid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: gid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fchown_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	int32_t fd;

	/* Parameter 1: res (type: PT_ERRNO)*/
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: uid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: gid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_fchownat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	int32_t fd;

	/* Parameter 1: res (type: PT_ERRNO)*/
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;

	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;

	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: pathname (type: PT_FSRELPATH) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);

	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: uid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: gid (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);

	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 6: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	res = val_to_ring(args, fchownat_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_capset_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;
	const struct cred *cred;

	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	cred = get_current_cred();
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0)
	val = ((uint64_t)cred->cap_inheritable.cap[1] << 32) | cred->cap_inheritable.cap[0];
#else
	val = (uint64_t)cred->cap_inheritable.val;
#endif
	res = val_to_ring(args, capabilities_to_scap(val), 0, false, 0);
	if(unlikely(res != PPM_SUCCESS))
		goto out;

#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0)
	val = ((uint64_t)cred->cap_permitted.cap[1] << 32) | cred->cap_permitted.cap[0];
#else
	val = (uint64_t)cred->cap_permitted.val;
#endif
	res = val_to_ring(args, capabilities_to_scap(val), 0, false, 0);
	if(unlikely(res != PPM_SUCCESS))
		goto out;

#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0)
	val = ((uint64_t)cred->cap_effective.cap[1] << 32) | cred->cap_effective.cap[0];
#else
	val = (uint64_t)cred->cap_effective.val;
#endif
	res = val_to_ring(args, capabilities_to_scap(val), 0, false, 0);
	if(unlikely(res != PPM_SUCCESS))
		goto out;

	put_cred(cred);

	return add_sentinel(args);

out: 
	put_cred(cred);
	return res;
}

int f_sys_splice_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd_in, fd_out;
	int res;

	/* Parameter 1: fd_in (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd_in = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd_in, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd_out (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	fd_out = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd_out, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: size (type: PT_UINT64) */
	syscall_get_arguments_deprecated(args, 4, 1, &val);
	res = val_to_ring(args, val, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 5, 1, &val);
	res = val_to_ring(args, splice_flags_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_umount_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: name (type: PT_FSPATH) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_umount2_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;

	/* Parameter 1: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, umount2_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_umount2_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int64_t retval;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: name (type: PT_FSPATH) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getcwd_x(struct event_filler_arguments *args)
{
	unsigned long val;

	/* Parameter 1: res (type: PT_ERRNO) */
	long retval = syscall_get_return_value(current, args->regs);
	int res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* we get the path only in case of success, in case of failure we would read only userspace junk */
	if(retval >= 0)
	{
		/* Parameter 2: path (type: PT_CHARBUF) */
		syscall_get_arguments_deprecated(args, 0, 1, &val);
		res = val_to_ring(args, val, 0, true, 0);
	}
	else
	{
		/* Parameter 2: path (type: PT_CHARBUF) */
		push_empty_param(args);
	}

	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getdents_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd = 0; 
	int res;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_getdents64_e(struct event_filler_arguments *args)
{
	unsigned long val;
	int32_t fd = 0; 
	int res;

	/* Parameter 1: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

#ifdef CAPTURE_SCHED_PROC_EXEC
int f_sched_prog_exec(struct event_filler_arguments *args)
{
	int res = 0;
	struct mm_struct *mm = current->mm;
	int args_len = 0;
	int correctly_read = 0;
	unsigned int exe_len = 0; /* the length of the executable string. */
	int ptid = 0;
	long total_vm = 0;
	long total_rss = 0;
	long swap = 0;
	int available = STR_STORAGE_SIZE;
	long env_len = 0;
	uint32_t tty_nr = 0;
	uint32_t flags = 0;
	bool exe_writable = false;
	bool exe_upper_layer = false;
	struct file *exe_file = NULL;
	const struct cred *cred = NULL;
	unsigned long i_ino = 0;
	unsigned long ctime = 0;
	unsigned long mtime = 0;
	uint32_t loginuid = UINT32_MAX;
	uint64_t cap_inheritable = 0;
	uint64_t cap_permitted = 0;
	uint64_t cap_effective = 0;
	uint32_t euid = UINT32_MAX;
	char* buf = (char*)args->str_storage;
	char *trusted_exepath = NULL;

	/* Parameter 1: res (type: PT_ERRNO) */
	/* Please note: if this filler is called the execve is correctly
	 * performed, so the return value will be always 0.
	 */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res); 
	/*
	* The call always succeed so get `exe`, `args` from the current
	* process; put one \0-separated exe-args string into
	* str_storage
	*/
	if(unlikely(!mm))
	{
		args->str_storage[0] = 0;
		pr_info("'f_sched_prog_exec' drop, mm=NULL\n");
		return PPM_FAILURE_BUG;
	}

	if(unlikely(!mm->arg_end))
	{
		args->str_storage[0] = 0;
		pr_info("'f_sched_prog_exec' drop, mm->arg_end=NULL\n");
		return PPM_FAILURE_BUG;
	}

	/* the combined length of the arguments string + executable string. */
	args_len = mm->arg_end - mm->arg_start;

	if(args_len > PAGE_SIZE)
	{
		args_len = PAGE_SIZE;
	}

	correctly_read = ppm_copy_from_user(args->str_storage, (const void __user *)mm->arg_start, args_len);

	if(args_len && correctly_read == 0)
	{
		args->str_storage[args_len - 1] = 0;
	}
	else
	{
		args_len = 0;
		*args->str_storage = 0;
	}

	exe_len = strnlen(args->str_storage, args_len);
	if(exe_len < args_len)
	{
		++exe_len;
	}

	/* Parameter 2: exe (type: PT_CHARBUF) */
	res = val_to_ring(args, (uint64_t)(long)args->str_storage, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: args (type: PT_CHARBUFARRAY) */
	res = val_to_ring(args, (int64_t)(long)args->str_storage + exe_len, args_len - exe_len, false, 0);
	CHECK_RES(res);

	/* Parameter 4: tid (type: PT_PID) */
	res = val_to_ring(args, (int64_t)current->pid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: pid (type: PT_PID) */
	res = val_to_ring(args, (int64_t)current->tgid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 6: ptid (type: PT_PID) */
	if(current->real_parent)
	{
		ptid = current->real_parent->pid;
	}

	res = val_to_ring(args, (int64_t)ptid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 7: cwd (type: PT_CHARBUF)
	 * cwd, pushed empty to avoid breaking compatibility
	 * with the older event format
	 */
	res = push_empty_param(args);
	CHECK_RES(res);

	/* Parameter 8: fdlimit (type: PT_UINT64) */
	res = val_to_ring(args, (int64_t)rlimit(RLIMIT_NOFILE), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 9: pgft_maj (type: PT_UINT64) */
	res = val_to_ring(args, current->maj_flt, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 10: pgft_min (type: PT_UINT64) */
	res = val_to_ring(args, current->min_flt, 0, false, 0);
	CHECK_RES(res);

	if(mm)
	{
		total_vm = mm->total_vm << (PAGE_SHIFT - 10);
		total_rss = ppm_get_mm_rss(mm) << (PAGE_SHIFT - 10);
		swap = ppm_get_mm_swap(mm) << (PAGE_SHIFT - 10);
	}

	/* Parameter 11: vm_size (type: PT_UINT32) */
	res = val_to_ring(args, total_vm, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 12: vm_rss (type: PT_UINT32) */
	res = val_to_ring(args, total_rss, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 13: vm_swap (type: PT_UINT32) */
	res = val_to_ring(args, swap, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 14: comm (type: PT_CHARBUF) */
	res = val_to_ring(args, (uint64_t)current->comm, 0, false, 0);
	CHECK_RES(res);

	args->str_storage[0] = 0;
#ifdef CONFIG_CGROUPS
	rcu_read_lock();
#include <linux/cgroup_subsys.h>
cgroups_error:
	rcu_read_unlock();
#endif

	/* Parameter 15: cgroups (type: PT_CHARBUFARRAY) */
	res = val_to_ring(args, (int64_t)(long)args->str_storage, STR_STORAGE_SIZE - available, false, 0);
	CHECK_RES(res);

	env_len = mm->env_end - mm->env_start;
	if(env_len > PAGE_SIZE)
	{
		env_len = PAGE_SIZE;
	}

	correctly_read = ppm_copy_from_user(args->str_storage, (const void __user *)mm->env_start, env_len);

	if(env_len && correctly_read == 0)
	{
		args->str_storage[env_len - 1] = 0;
	}
	else
	{
		env_len = 0;
		*args->str_storage = 0;
	}

	/* Parameter 16: env (type: PT_CHARBUFARRAY) */
	res = val_to_ring(args, (int64_t)(long)args->str_storage, env_len, false, 0);
	CHECK_RES(res);

	/* Parameter 17: tty (type: PT_UINT32) */
	tty_nr = ppm_get_tty();
	res = val_to_ring(args, tty_nr, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 18: pgid (type: PT_PID) */
	res = val_to_ring(args, (int64_t)task_pgrp_nr_ns(current, task_active_pid_ns(current)), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 19: loginuid (type: PT_UID) */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
	loginuid = from_kuid(current_user_ns(), audit_get_loginuid(current));
#else
	loginuid = audit_get_loginuid(current);
#endif
	res = val_to_ring(args, loginuid, 0, false, 0);
	CHECK_RES(res);

	/* `exe_writable` and `exe_upper_layer` flag logic */
	exe_file = ppm_get_mm_exe_file(mm);
	if(exe_file != NULL)
	{
		if(file_inode(exe_file) != NULL)
		{
			/* Support exe_writable */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 3, 0)
			exe_writable |= (file_permission(exe_file, MAY_WRITE | MAY_NOT_BLOCK) == 0);
			exe_writable |= inode_owner_or_capable(file_mnt_idmap(exe_file), file_inode(exe_file));
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
			exe_writable |= (inode_permission(current_user_ns(), file_inode(exe_file), MAY_WRITE | MAY_NOT_BLOCK) == 0);
			exe_writable |= inode_owner_or_capable(current_user_ns(), file_inode(exe_file));
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
			exe_writable |= (inode_permission(file_inode(exe_file), MAY_WRITE | MAY_NOT_BLOCK) == 0);
			exe_writable |= inode_owner_or_capable(file_inode(exe_file));
#endif
			/*
			 * Kernels < 3.1.0 doesn't support the exe_writable flags due to the MAY_NOT_BLOCK not being
			 * available. This limitation is related to the fact that this function (f_sched_prog_exec)
			 * is in a RCU critical section: this means that this function (and its callee) MUST NOT
			 * call functions that can yield the processor (e.g. inode_permission that deep down in its
			 * call stack calls a down_read()). This is addressed after the Kernel 3.1.0 where the
			 * MAY_OT_BLOCK flag is introduced and avoids the processor to being yield.
			 */

			/* Support exe_upper_layer */
			exe_upper_layer = ppm_is_upper_layer(exe_file);

			/* Support exe_from_memfd */
			flags |= get_exe_from_memfd(exe_file);

			/* Support inode number */
			i_ino = file_inode(exe_file)->i_ino;

			/* Support exe_file ctime 
			 * During kernel versions `i_ctime` changed from `struct timespec` to `struct timespec64`
			 * but fields names should be always the same.
			 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 6, 0)
			{
				struct timespec64 inode_ctime;
				inode_ctime = inode_get_ctime(file_inode(exe_file));
				ctime = inode_ctime.tv_sec * (uint64_t) 1000000000 + inode_ctime.tv_nsec;
			}
#else
			ctime = file_inode(exe_file)->i_ctime.tv_sec * (uint64_t) 1000000000 + file_inode(exe_file)->i_ctime.tv_nsec;
#endif

			/* Support exe_file mtime 
			 * During kernel versions `i_mtime` changed from `struct timespec` to `struct timespec64`
			 * but fields names should be always the same.
			 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 7, 0)
			{
				struct timespec64 inode_mtime;
				inode_mtime = inode_get_mtime(file_inode(exe_file));
				mtime = inode_mtime.tv_sec * (uint64_t)1000000000 + inode_mtime.tv_nsec;
			}
#else
			mtime = file_inode(exe_file)->i_mtime.tv_sec * (uint64_t) 1000000000 + file_inode(exe_file)->i_mtime.tv_nsec;
#endif
		}
		/* Before free the exefile we catch the resolved path for symlink resolution */
		trusted_exepath = d_path(&exe_file->f_path, buf, PAGE_SIZE);
		fput(exe_file);
	}

	/* The trusted_exepath could end with the suffix " (deleted)".
	 * https://github.com/torvalds/linux/blob/2dde18cd1d8fac735875f2e4987f11817cc0bc2c/fs/d_path.c#L255
	 * This is unhandy to manage in userspace, for this reason, we can remove it here
	 */
	if(trusted_exepath != NULL)
	{
		char deleted_suffix[] = " (deleted)";
		int diff_len = strlen(trusted_exepath) - strlen(deleted_suffix);
		if(diff_len > 0 &&
			(strncmp(&trusted_exepath[diff_len], deleted_suffix, sizeof(deleted_suffix)) == 0))
		{					
			trusted_exepath[diff_len] = '\0';
		}
	}

	if(exe_writable)
	{
		flags |= PPM_EXE_WRITABLE;
	}

	if(exe_upper_layer)
	{
		flags |= PPM_EXE_UPPER_LAYER;
	}

	// write all the additional flags for execve family here...

	/* Parameter 20: flags (type: PT_FLAGS32) */
	res = val_to_ring(args, flags, 0, false, 0);
	CHECK_RES(res);

	/*
	 * capabilities
	 */

	cred = get_current_cred();
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0)
	cap_inheritable = ((uint64_t)cred->cap_inheritable.cap[1] << 32) | cred->cap_inheritable.cap[0];
	cap_permitted = ((uint64_t)cred->cap_permitted.cap[1] << 32) | cred->cap_permitted.cap[0];
	cap_effective = ((uint64_t)cred->cap_effective.cap[1] << 32) | cred->cap_effective.cap[0];
#else
	cap_inheritable = (uint64_t)cred->cap_inheritable.val;
	cap_permitted = (uint64_t)cred->cap_permitted.val;
	cap_effective = (uint64_t)cred->cap_effective.val;
#endif	
	put_cred(cred);

	/* Parameter 21: cap_inheritable (type: PT_UINT64) */
	res = val_to_ring(args, capabilities_to_scap(cap_inheritable), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 22: cap_permitted (type: PT_UINT64) */
	res = val_to_ring(args, capabilities_to_scap(cap_permitted), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 23: cap_effective (type: PT_UINT64) */
	res = val_to_ring(args, capabilities_to_scap(cap_effective), 0, false, 0);
	CHECK_RES(res);

	/*
	 * exe ino fields
	 */

	/* Parameter 24: exe_file ino (type: PT_UINT64) */
	res = val_to_ring(args, i_ino, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 25: exe_file ctime (last status change time, epoch value in nanoseconds) (type: PT_ABSTIME) */
	res = val_to_ring(args, ctime, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 26: exe_file mtime (last modification time, epoch value in nanoseconds) (type: PT_ABSTIME) */
	res = val_to_ring(args, mtime, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 27: euid (type: PT_UID) */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
	euid = from_kuid_munged(current_user_ns(), current_euid());
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
	euid = current_euid();
#else
	euid = current->euid;
#endif
	res = val_to_ring(args, euid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 28: trusted_exepath (type: PT_FSPATH) */
	res = val_to_ring(args, (unsigned long)trusted_exepath, 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}
#endif


#ifdef CAPTURE_SCHED_PROC_FORK
int f_sched_prog_fork(struct event_filler_arguments *args)
{
	int res = 0;
	struct task_struct *child = args->child;
	struct mm_struct *mm = child->mm;
	int args_len = 0;
	int correctly_read = 0;
	unsigned int exe_len = 0; /* the length of the executable string. */
	int ptid = 0;
	long total_vm = 0;
	long total_rss = 0;
	long swap = 0;
	int available = STR_STORAGE_SIZE;
	uint32_t flags = 0;
	uint32_t euid = task_euid(child).val;
	uint32_t egid = child->cred->egid.val;
	struct pid_namespace *pidns = task_active_pid_ns(child);
	uint64_t pidns_init_start_time = 0;

	/* Parameter 1: res (type: PT_ERRNO) */
	/* Please note: here we are in the clone child exit
	 * event, so the return value will be always 0.
	 */
	res = val_to_ring(args, 0, 0, false, 0);
	CHECK_RES(res);

	/*
	* The call always succeed so get `exe`, `args` from the child
	* process; put one \0-separated exe-args string into
	* str_storage
	*/
	if(unlikely(!mm))
	{
		args->str_storage[0] = 0;
		pr_info("'f_sched_prog_fork' drop, mm=NULL\n");
		return PPM_FAILURE_BUG;
	}

	if(unlikely(!mm->arg_end))
	{
		args->str_storage[0] = 0;
		pr_info("'f_sched_prog_fork' drop, mm->arg_end=NULL\n");
		return PPM_FAILURE_BUG;
	}

	/* the combined length of the arguments string + executable string. */
	args_len = mm->arg_end - mm->arg_start;

	if(args_len > PAGE_SIZE)
	{
		args_len = PAGE_SIZE;
	}

	correctly_read = ppm_copy_from_user(args->str_storage, (const void __user *)mm->arg_start, args_len);

	if(args_len && correctly_read == 0)
	{
		args->str_storage[args_len - 1] = 0;
	}
	else
	{
		args_len = 0;
		*args->str_storage = 0;
	}

	exe_len = strnlen(args->str_storage, args_len);
	if(exe_len < args_len)
	{
		++exe_len;
	}

	/* Parameter 2: exe (type: PT_CHARBUF) */
	res = val_to_ring(args, (uint64_t)(long)args->str_storage, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 3: args (type: PT_CHARBUFARRAY) */
	res = val_to_ring(args, (int64_t)(long)args->str_storage + exe_len, args_len - exe_len, false, 0);
	CHECK_RES(res);

	/* Parameter 4: tid (type: PT_PID) */
	res = val_to_ring(args, (int64_t)child->pid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 5: pid (type: PT_PID) */
	res = val_to_ring(args, (int64_t)child->tgid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 6: ptid (type: PT_PID) */
	if(child->real_parent)
	{
		ptid = child->real_parent->pid;
	}

	res = val_to_ring(args, (int64_t)ptid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 7: cwd (type: PT_CHARBUF)
	 * cwd, pushed empty to avoid breaking compatibility
	 * with the older event format
	 */
	res = push_empty_param(args);
	CHECK_RES(res);

	/* Parameter 8: fdlimit (type: PT_UINT64) */
	res = val_to_ring(args, (int64_t)rlimit(RLIMIT_NOFILE), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 9: pgft_maj (type: PT_UINT64) */
	res = val_to_ring(args, child->maj_flt, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 10: pgft_min (type: PT_UINT64) */
	res = val_to_ring(args, child->min_flt, 0, false, 0);
	CHECK_RES(res);

	if(mm)
	{
		total_vm = mm->total_vm << (PAGE_SHIFT - 10);
		total_rss = ppm_get_mm_rss(mm) << (PAGE_SHIFT - 10);
		swap = ppm_get_mm_swap(mm) << (PAGE_SHIFT - 10);
	}

	/* Parameter 11: vm_size (type: PT_UINT32) */
	res = val_to_ring(args, total_vm, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 12: vm_rss (type: PT_UINT32) */
	res = val_to_ring(args, total_rss, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 13: vm_swap (type: PT_UINT32) */
	res = val_to_ring(args, swap, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 14: comm (type: PT_CHARBUF) */
	res = val_to_ring(args, (uint64_t)child->comm, 0, false, 0);
	CHECK_RES(res);

	args->str_storage[0] = 0;
#ifdef CONFIG_CGROUPS
	rcu_read_lock();
#include <linux/cgroup_subsys.h>
cgroups_error:
	rcu_read_unlock();
#endif

	/* Parameter 15: cgroups (type: PT_CHARBUFARRAY) */
	res = val_to_ring(args, (int64_t)(long)args->str_storage, STR_STORAGE_SIZE - available, false, 0);
	CHECK_RES(res);

	/* Since Linux 2.5.35, the flags mask must also include
	 * CLONE_SIGHAND if CLONE_THREAD is specified (and note that,
	 * since Linux 2.6.0, CLONE_SIGHAND also requires CLONE_VM to
	 * be included). 
	 * Taken from https://man7.org/linux/man-pages/man2/clone.2.html
	 */
	if(child->pid != child->tgid)
	{
		flags |= PPM_CL_CLONE_THREAD | PPM_CL_CLONE_SIGHAND | PPM_CL_CLONE_VM;
	}

	/* If CLONE_FILES is set, the calling process and the child
	 * process share the same file descriptor table.
	 * Taken from https://man7.org/linux/man-pages/man2/clone.2.html
	 */
	if(child->files == current->files)
	{
		flags |= PPM_CL_CLONE_FILES;
	}

	/* It's possible to have a process in a PID namespace that 
	 * nevertheless has tid == vtid,  so we need to generate this
	 * custom flag `PPM_CL_CHILD_IN_PIDNS`.
	 */
	if(pidns != &init_pid_ns)
	{
		flags |= PPM_CL_CHILD_IN_PIDNS;
	}

	/* Parameter 16: flags (type: PT_FLAGS32) */
	res = val_to_ring(args, flags, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 17: uid (type: PT_UID) */
	res = val_to_ring(args, euid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 18: gid (type: PT_UINT32) */
	res = val_to_ring(args, egid, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 19: vtid (type: PT_PID) */
	res = val_to_ring(args, task_pid_nr_ns(child, pidns), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 20: vpid (type: PT_PID) */
	res = val_to_ring(args, task_tgid_nr_ns(child, pidns), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 21: pid_namespace init task start_time monotonic time in ns (type: PT_UINT64) */

	/*
	 * pid_namespace init task start_time monotonic time in ns
	 * the field `start_time` was a `struct timespec` before this
	 * kernel version.
	 * https://elixir.bootlin.com/linux/v3.16/source/include/linux/sched.h#L1370
	 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
	/* Here the father collects this info for the child.
	 * Remember that this is the clone child event.
	 */
	if(pidns && pidns->child_reaper)
	{
		pidns_init_start_time = pidns->child_reaper->start_time;
	}
	res = val_to_ring(args, pidns_init_start_time, 0, false, 0);
#else
	/* Not relevant in old kernels */
	res = val_to_ring(args, 0, 0, false, 0);
#endif
	CHECK_RES(res);

	return add_sentinel(args);
}
#endif

int f_sys_prctl_x(struct event_filler_arguments *args)
{
	int res;
	int retval;
	unsigned long option;
	unsigned long arg2;

	/* Parameter 1: res (type: PT_ERRNO) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/*
	 * option
	 */
	syscall_get_arguments_deprecated(args, 0, 1, &option);
	option = prctl_options_to_scap(option);
	res = val_to_ring(args, option, 0, false, 0);
	CHECK_RES(res);

	/*
	 * arg2
	 */
	syscall_get_arguments_deprecated(args, 1, 1, &arg2);

	switch(option){
		case PPM_PR_GET_NAME:
		case PPM_PR_SET_NAME:
			/*
			 * arg2_str
			 */
			res = val_to_ring(args, arg2, 0, true, 0);
			CHECK_RES(res);
			/*
			 * arg2_int
			 */
			res = val_to_ring(args, 0, 0, false, 0);
			CHECK_RES(res);
			break;
		case PPM_PR_GET_CHILD_SUBREAPER:
			{
				int reaper_attr = 0;
				/* Parameter 3: arg2_str (type: PT_CHARBUF) */
				res = push_empty_param(args);
				CHECK_RES(res);
				/* Parameter 4: arg2_int (type: PT_INT64) */
				if(unlikely(ppm_copy_from_user(&reaper_attr, (void *)arg2, sizeof(reaper_attr))))
				{
					reaper_attr = 0;
				}
				res = val_to_ring(args, (int64_t)reaper_attr, 0, false, 0);
				CHECK_RES(res);
			}
			break;
		case PPM_PR_SET_CHILD_SUBREAPER:
		default:
			/*
			 * arg2_str
			 */
			res = push_empty_param(args);
			CHECK_RES(res);
			/*
			 * arg2_int
			 */
			res = val_to_ring(args, arg2, 0, false, 0);
			CHECK_RES(res);
			break;
	}

	return add_sentinel(args);
}

int f_sys_memfd_create_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;

	/* Parameter 1: ret (type: PT_FD) */
	retval = (int64_t)syscall_get_return_value(current, args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);


	/* Parameter 2: name (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);


	/* Parameter 3: flags (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, memfd_create_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_pidfd_getfd_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;
	int32_t fd;

	/* Parameter 1: ret (type: PT_FD) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	
	/* Parameter 2: pidfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: targetfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);
	
	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	
	return add_sentinel(args);
}

int f_sys_pidfd_open_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;
	int32_t fd;

	/* Parameter 1: ret (type: PT_FD) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);
	
	/* Parameter 2: pid (type: PT_PID) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);
	
	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, pidfd_open_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_init_module_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;
	uint64_t len;

	/* Parameter 1: ret (type: PT_ERRNO) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	syscall_get_arguments_deprecated(args, 1, 1, &val);
	len = val;

	/* Parameter 2: img (type: PT_BYTBUF) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, len, true, 0);
	CHECK_RES(res);

	/* Parameter 3: length (type: PT_UINT64) */
	res = val_to_ring(args, len, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 2: uargs (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_finit_module_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;
	int32_t fd;

	/* Parameter 1: ret (type: PT_ERRNO) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: fd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: uargs (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);
	
	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, finit_module_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mknod_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	long retval;

	/* Parameter 1: ret (type: PT_ERRNO) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: path (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: mode (type: PT_MODE) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, mknod_mode_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: dev (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, new_encode_dev(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_mknodat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	long retval;

	/* Parameter 1: ret (type: PT_ERRNO) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 2: path (type: PT_CHARBUF) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: mode (type: PT_MODE) */
	syscall_get_arguments_deprecated(args, 2, 1, &val);
	res = val_to_ring(args, mknod_mode_to_scap(val), 0, false, 0);
	CHECK_RES(res);

	/* Parameter 4: dev (type: PT_UINT32) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, new_encode_dev(val), 0, false, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}

int f_sys_newfstatat_x(struct event_filler_arguments *args)
{
	unsigned long val;
	int res;
	int32_t fd;
	long retval;

	/* Parameter 1: ret (type: PT_ERRNO) */
	retval = (int64_t) syscall_get_return_value(current,args->regs);
	res = val_to_ring(args, retval, 0, false, 0);
	CHECK_RES(res);

	/* Parameter 2: dirfd (type: PT_FD) */
	syscall_get_arguments_deprecated(args, 0, 1, &val);
	fd = (int32_t)val;
	if (fd == AT_FDCWD)
		fd = PPM_AT_FDCWD;
	res = val_to_ring(args, (int64_t)fd, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 3: path (type: PT_RELPATH) */
	syscall_get_arguments_deprecated(args, 1, 1, &val);
	res = val_to_ring(args, val, 0, true, 0);
	CHECK_RES(res);

	/* Parameter 4: flags (type: PT_FLAGS32) */
	syscall_get_arguments_deprecated(args, 3, 1, &val);
	res = val_to_ring(args, newfstatat_flags_to_scap(val), 0, true, 0);
	CHECK_RES(res);

	return add_sentinel(args);
}