fix: more futzing around with dummy plugins

plugins/cedanagpu/Makefile

@@ -0,0 +1,30 @@
+PLUGIN_NAME		:= cedana_plugin 
+PLUGIN_SOBJ		:= cedana_plugin.so
+
+PLUGIN_DIR := /home/nravic/cedana-gpu/
+
+PLUGIN_INCLUDE  	:= -iquote../../include
+PLUGIN_INCLUDE  	+= -iquote../../criu/include
+PLUGIN_INCLUDE  	+= -iquote../../criu/arch/$(ARCH)/include/
+PLUGIN_INCLUDE  	+= -iquote../../
+
+COMPEL                 := ../../compel/compel-host
+DEPS_OK 		:= cedana_plugin.so 
+DEPS_NOK 		:= ;
+
+__nmk_dir ?= ../../scripts/nmk/scripts/
+include $(__nmk_dir)msg.mk
+
+CC      		:= gcc
+PLUGIN_CFLAGS  		:= -g -Wall -D _GNU_SOURCE -shared -nostartfiles -fPIC -DCR_PLUGIN_DEFAULT="$(PLUGINDIR)"
+
+all: $(DEPS_OK)
+
+cedana_plugin.so: cedana_plugin.c 
+	$(CC) $(PLUGIN_CFLAGS) $(shell $(COMPEL) includes) $^ -o $@ $(PLUGIN_INCLUDE) 
+
+cedana_plugin_clean:
+	$(call msg-clean, $@)
+	$(Q) $(RM) cedana_plugin.so 
+.PHONY:cedana_plugin_clean 
+

plugins/cedanagpu/cedana_plugin.c

@@ -0,0 +1,215 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <linux/limits.h>
+
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+#include "criu-plugin.h"
+#include "plugin.h"
+#include "xmalloc.h"
+#include "criu-log.h"
+#include "files.h"
+
+#include "common/list.h"
+
+#include "img-streamer.h"
+#include "image.h"
+#include "cr_options.h"
+
+#ifdef LOG_PREFIX
+#undef LOG_PREFIX
+#endif
+#define LOG_PREFIX "cedana_plugin: "
+
+#ifdef DEBUG
+#define plugin_log_msg(fmt, ...) pr_debug(fmt, ##__VA_ARGS__)
+#else
+#define plugin_log_msg(fmt, ...) \
+	{                        \
+	}
+#endif
+
+
+int write_fp(FILE *fp, const void *buf, const size_t buf_len)
+{
+	size_t len_write;
+
+	len_write = fwrite(buf, 1, buf_len, fp);
+	if (len_write != buf_len) {
+		pr_perror("Unable to write file (wrote:%ld buf_len:%ld)", len_write, buf_len);
+		return -EIO;
+	}
+	return 0;
+}
+
+int read_fp(FILE *fp, void *buf, const size_t buf_len)
+{
+	size_t len_read;
+
+	len_read = fread(buf, 1, buf_len, fp);
+	if (len_read != buf_len) {
+		pr_perror("Unable to read file (read:%ld buf_len:%ld)", len_read, buf_len);
+		return -EIO;
+	}
+	return 0;
+}
+
+/**
+ * @brief Open an image file
+ *
+ * We store the size of the actual contents in the first 8-bytes of the file. This allows us to
+ * determine the file size when using criu_image_streamer when fseek and fstat are not available.
+ * The FILE * returned is already at the location of the first actual contents.
+ *
+ * @param path The file path
+ * @param write False for read, true for write
+ * @param size Size of actual contents
+ * @return FILE *if successful, NULL if failed
+ */
+FILE *open_img_file(char *path, bool write, size_t *size)
+{
+	FILE *fp = NULL;
+	int fd, ret;
+
+	if (opts.stream)
+		fd = img_streamer_open(path, write ? O_DUMP : O_RSTR);
+	else
+		fd = openat(criu_get_image_dir(), path, write ? (O_WRONLY | O_CREAT) : O_RDONLY, 0600);
+
+	if (fd < 0) {
+		pr_perror("%s: Failed to open for %s", path, write ? "write" : "read");
+		return NULL;
+	}
+
+	fp = fdopen(fd, write ? "w" : "r");
+	if (!fp) {
+		pr_perror("%s: Failed get pointer for %s", path, write ? "write" : "read");
+		return NULL;
+	}
+
+	if (write)
+		ret = write_fp(fp, size, sizeof(*size));
+	else
+		ret = read_fp(fp, size, sizeof(*size));
+
+	if (ret) {
+		pr_perror("%s:Failed to access file size", path);
+		fclose(fp);
+		return NULL;
+	}
+
+	pr_debug("%s:Opened file for %s with size:%ld\n", path, write ? "write" : "read", *size);
+	return fp;
+}
+
+/**
+ * @brief Write an image file
+ *
+ * We store the size of the actual contents in the first 8-bytes of the file. This allows us to
+ * determine the file size when using criu_image_streamer when fseek and fstat are not available.
+ *
+ * @param path The file path
+ * @param buf pointer to data to be written
+ * @param buf_len size of buf
+ * @return 0 if successful. -errno on failure
+ */
+int write_img_file(char *path, const void *buf, const size_t buf_len)
+{
+	int ret;
+	FILE *fp;
+	size_t len = buf_len;
+
+	fp = open_img_file(path, true, &len);
+	if (!fp)
+		return -errno;
+
+	ret = write_fp(fp, buf, buf_len);
+	fclose(fp); /* this will also close fd */
+	return ret;
+}
+
+int read_file(const char *file_path, void *buf, const size_t buf_len)
+{
+	int ret;
+	FILE *fp;
+
+	fp = fopen(file_path, "r");
+	if (!fp) {
+		pr_perror("Cannot fopen %s", file_path);
+		return -errno;
+	}
+
+	ret = read_fp(fp, buf, buf_len);
+	fclose(fp); /* this will also close fd */
+	return ret;
+}
+
+int cedana_plugin_init(int stage)
+{
+	pr_info("cedana_plugin: started");
+	return 0;
+}
+
+void cedana_plugin_fini(int stage, int ret)
+{
+	pr_info("cedana_plugin: finished");
+}
+
+
+CR_PLUGIN_REGISTER("cedanagpu_plugin", cedana_plugin_init, cedana_plugin_fini)
+
+int cedana_plugin_handle_device_vma(int fd, const struct stat *st_buf)
+{
+	pr_info("cedana_plugin_handle_device_vma called");
+	return 0;
+}
+
+CR_PLUGIN_REGISTER_HOOK(CR_PLUGIN_HOOK__HANDLE_DEVICE_VMA, cedana_plugin_handle_device_vma)
+
+
+int cedana_plugin_dump_file(int fd, int id)
+{
+	pr_info("cedana_plugin_dump_file called");
+	return 0;
+}
+
+CR_PLUGIN_REGISTER_HOOK(CR_PLUGIN_HOOK__DUMP_EXT_FILE, cedana_plugin_dump_file)
+
+
+int cedana_plugin_restore_file(int id)
+{
+	pr_info("cedana_plugin_restore_file called");
+	return 0;
+}
+
+CR_PLUGIN_REGISTER_HOOK(CR_PLUGIN_HOOK__RESTORE_EXT_FILE, cedana_plugin_restore_file)
+
+int cedana_plugin_update_vmamap(const char *in_path, const uint64_t addr, const uint64_t old_offset,
+				uint64_t *new_offset, int *updated_fd)
+{
+	pr_info("cedana_plugin_update_vmamap called");
+	return 0;
+}
+
+CR_PLUGIN_REGISTER_HOOK(CR_PLUGIN_HOOK__UPDATE_VMA_MAP, cedana_plugin_update_vmamap)
+
+
+int cedana_plugin_resume_devices_late(int pid)
+{
+	pr_info("cedana_plugin_resume_devices_late called");
+	return 0;
+}
+
+CR_PLUGIN_REGISTER_HOOK(CR_PLUGIN_HOOK__RESUME_DEVICES_LATE, cedana_plugin_resume_devices_late)