Auto merge of #2416 - devnexen:fbsd_timer_api, r=JohnTitor

freebsd add timer api.

Author: bors

libc-test/semver/freebsd.txt

@@ -1750,6 +1750,12 @@ sysctl
 sysctlbyname
 sysctlnametomib
 telldir
+timer_create
+timer_delete
+timer_getoverrun
+timer_gettime
+timer_settime
+timer_t
 timex
 truncate
 ttyname_r

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -5,6 +5,7 @@ pub type lwpid_t = i32;
 pub type blksize_t = i32;
 pub type clockid_t = ::c_int;
 pub type sem_t = _sem;
+pub type timer_t = *mut __c_anonymous__timer;
 
 pub type fsblkcnt_t = u64;
 pub type fsfilcnt_t = u64;
@@ -249,6 +250,15 @@ s! {
         envv: *mut ::c_void,
         core: ::uintptr_t,
     }
+
+    pub struct itimerspec {
+        pub it_interval: ::timespec,
+        pub it_value: ::timespec,
+    }
+
+    pub struct __c_anonymous__timer {
+        _priv: [::c_int; 3],
+    }
 }
 
 s_no_extra_traits! {
@@ -1953,6 +1963,20 @@ extern "C" {
     pub fn procstat_close(procstat: *mut procstat);
 }
 
+#[link(name = "rt")]
+extern "C" {
+    pub fn timer_create(clock_id: clockid_t, evp: *mut sigevent, timerid: *mut timer_t) -> ::c_int;
+    pub fn timer_delete(timerid: timer_t) -> ::c_int;
+    pub fn timer_getoverrun(timerid: timer_t) -> ::c_int;
+    pub fn timer_gettime(timerid: timer_t, value: *mut itimerspec) -> ::c_int;
+    pub fn timer_settime(
+        timerid: timer_t,
+        flags: ::c_int,
+        value: *const itimerspec,
+        ovalue: *mut itimerspec,
+    ) -> ::c_int;
+}
+
 cfg_if! {
     if #[cfg(freebsd13)] {
         mod freebsd13;