Haiku: add additional functionality in libbsd.so

This includes:
 * sys/event.h: `kevent()`, `kqueue()`, data structure and constants
 * sys/iocomm.h: constants that are also defined for other platforms
 * stdlib.h: `mkstemps()` and `strtonum()`
 * sys/uov.h: `preadv()` and `pwritev()`
 * sys/wait.h: `wait4()`

src/unix/haiku/bsd.rs

@@ -22,6 +22,17 @@ s! {
         pub sl_cur: size_t,
     }
 
+    // sys/event.h
+    pub struct kevent {
+        pub ident: crate::uintptr_t,
+        pub filter: c_short,
+        pub flags: c_ushort,
+        pub fflags: c_uint,
+        pub data: i64,
+        pub udata: *mut c_void,
+        pub ext: [u64; 4],
+    }
+
     // sys/link_elf.h
     pub struct dl_phdr_info {
         pub dlpi_addr: crate::Elf_Addr,
@@ -31,6 +42,25 @@ s! {
     }
 }
 
+// sys/event.h
+pub const EVFILT_READ: i16 = -1;
+pub const EVFILT_WRITE: i16 = -2;
+pub const EVFILT_PROC: i16 = -5;
+pub const EV_ADD: u16 = 0x0001;
+pub const EV_DELETE: u16 = 0x0002;
+pub const EV_ONESHOT: u16 = 0x0010;
+pub const EV_CLEAR: u16 = 0x0020;
+pub const EV_EOF: u16 = 0x8000;
+pub const EV_ERROR: u16 = 0x4000;
+pub const NOTE_EXIT: u32 = 0x80000000;
+
+// sys/ioccom.h
+pub const IOC_VOID: c_ulong = 0x20000000;
+pub const IOC_OUT: c_ulong = 0x40000000;
+pub const IOC_IN: c_ulong = 0x80000000;
+pub const IOC_INOUT: c_ulong = IOC_IN | IOC_OUT;
+pub const IOC_DIRMASK: c_ulong = 0xe0000000;
+
 #[link(name = "bsd")]
 extern "C" {
     // stdlib.h
@@ -40,6 +70,13 @@ extern "C" {
     pub fn arc4random() -> u32;
     pub fn arc4random_uniform(upper_bound: u32) -> u32;
     pub fn arc4random_buf(buf: *mut c_void, n: size_t);
+    pub fn mkstemps(template: *mut c_char, suffixlen: c_int) -> c_int;
+    pub fn strtonum(
+        nptr: *const c_char,
+        minval: c_longlong,
+        maxval: c_longlong,
+        errstr: *mut *const c_char,
+    ) -> c_longlong;
 
     // pty.h
     pub fn openpty(
@@ -68,6 +105,17 @@ extern "C" {
     pub fn sl_free(sl: *mut StringList, i: c_int);
     pub fn sl_find(sl: *mut StringList, n: *mut c_char) -> *mut c_char;
 
+    // sys/event.h
+    pub fn kqueue() -> c_int;
+    pub fn kevent(
+        kq: c_int,
+        changelist: *const kevent,
+        nchanges: c_int,
+        eventlist: *mut kevent,
+        nevents: c_int,
+        timeout: *const crate::timespec,
+    ) -> c_int;
+
     // sys/link_elf.h
     pub fn dl_iterate_phdr(
         callback: Option<
@@ -78,4 +126,26 @@ extern "C" {
 
     // sys/time.h
     pub fn lutimes(file: *const c_char, times: *const crate::timeval) -> c_int;
+
+    // sys/uov.h
+    pub fn preadv(
+        fd: c_int,
+        iov: *const crate::iovec,
+        iovcnt: c_int,
+        offset: crate::off_t,
+    ) -> ssize_t;
+    pub fn pwritev(
+        fd: c_int,
+        iov: *const crate::iovec,
+        iovcnt: c_int,
+        offset: crate::off_t,
+    ) -> ssize_t;
+
+    // sys/wait.h
+    pub fn wait4(
+        pid: crate::pid_t,
+        status: *mut c_int,
+        options: c_int,
+        rusage: *mut crate::rusage,
+    ) -> crate::pid_t;
 }