Support the timerfd API on FreeBSD.

FreeBSD has recently added support for Linux's timerfd API. Enable
rustix's timerfd API on FreeBSD as well.

src/backend/libc/time/syscalls.rs

@@ -2,7 +2,7 @@
 
 use crate::backend::c;
 use crate::backend::conv::ret;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(any(all(target_env = "gnu", fix_y2038), not(fix_y2038)))]
 use crate::backend::time::types::LibcItimerspec;
 #[cfg(not(target_os = "wasi"))]
@@ -21,7 +21,7 @@ use crate::timespec::as_libc_timespec_ptr;
 use crate::timespec::LibcTimespec;
 use crate::timespec::Timespec;
 use core::mem::MaybeUninit;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 use {
     crate::backend::conv::{borrowed_fd, ret_owned_fd},
     crate::fd::{BorrowedFd, OwnedFd},
@@ -34,10 +34,10 @@ weak!(fn __clock_gettime64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
 weak!(fn __clock_settime64(c::clockid_t, *const LibcTimespec) -> c::c_int);
 #[cfg(all(target_env = "gnu", fix_y2038))]
 weak!(fn __clock_getres64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(all(target_env = "gnu", fix_y2038))]
 weak!(fn __timerfd_gettime64(c::c_int, *mut LibcItimerspec) -> c::c_int);
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(all(target_env = "gnu", fix_y2038))]
 weak!(fn __timerfd_settime64(c::c_int, c::c_int, *const LibcItimerspec, *mut LibcItimerspec) -> c::c_int);
 
@@ -172,7 +172,7 @@ pub(crate) fn clock_gettime_dynamic(id: DynamicClockId<'_>) -> io::Result<Timesp
             return Err(io::Errno::INVAL);
         }
 
-        #[cfg(linux_kernel)]
+        #[cfg(any(linux_kernel, target_os = "fuchsia"))]
         DynamicClockId::RealtimeAlarm => c::CLOCK_REALTIME_ALARM,
 
         #[cfg(linux_kernel)]
@@ -298,12 +298,12 @@ fn clock_settime_old(id: ClockId, timespec: Timespec) -> io::Result<()> {
     unsafe { ret(c::clock_settime(id as c::clockid_t, &old_timespec)) }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 pub(crate) fn timerfd_create(id: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {
     unsafe { ret_owned_fd(c::timerfd_create(id as c::clockid_t, bitflags_bits!(flags))) }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 pub(crate) fn timerfd_settime(
     fd: BorrowedFd<'_>,
     flags: TimerfdTimerFlags,
@@ -345,7 +345,7 @@ pub(crate) fn timerfd_settime(
     }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 fn timerfd_settime_old(
     fd: BorrowedFd<'_>,
@@ -412,7 +412,7 @@ fn timerfd_settime_old(
     })
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 pub(crate) fn timerfd_gettime(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
     // Old 32-bit version: libc has `timerfd_gettime` but it is not y2038 safe
     // by default. But there may be a `__timerfd_gettime64` we can use.
@@ -443,7 +443,7 @@ pub(crate) fn timerfd_gettime(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
     }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 fn timerfd_gettime_old(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
     let mut old_result = MaybeUninit::<c::itimerspec>::uninit();

src/backend/libc/time/types.rs

@@ -1,21 +1,21 @@
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 use crate::backend::c;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 use crate::time::Itimerspec;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 use crate::timespec::LibcTimespec;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 use bitflags::bitflags;
 
 /// On most platforms, `LibcItimerspec` is just `Itimerspec`.
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(not(fix_y2038))]
 pub(crate) type LibcItimerspec = Itimerspec;
 
 /// On 32-bit glibc platforms, `LibcTimespec` differs from `Timespec`, so we
 /// define our own struct, with bidirectional `From` impls.
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 #[repr(C)]
 #[derive(Debug, Clone)]
@@ -24,7 +24,7 @@ pub(crate) struct LibcItimerspec {
     pub it_value: LibcTimespec,
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 impl From<LibcItimerspec> for Itimerspec {
     #[inline]
@@ -36,7 +36,7 @@ impl From<LibcItimerspec> for Itimerspec {
     }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(fix_y2038)]
 impl From<Itimerspec> for LibcItimerspec {
     #[inline]
@@ -48,7 +48,7 @@ impl From<Itimerspec> for LibcItimerspec {
     }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(not(fix_y2038))]
 pub(crate) fn as_libc_itimerspec_ptr(itimerspec: &Itimerspec) -> *const c::itimerspec {
     #[cfg(test)]
@@ -58,7 +58,7 @@ pub(crate) fn as_libc_itimerspec_ptr(itimerspec: &Itimerspec) -> *const c::itime
     crate::utils::as_ptr(itimerspec).cast::<c::itimerspec>()
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[cfg(not(fix_y2038))]
 pub(crate) fn as_libc_itimerspec_mut_ptr(
     itimerspec: &mut core::mem::MaybeUninit<Itimerspec>,
@@ -70,7 +70,7 @@ pub(crate) fn as_libc_itimerspec_mut_ptr(
     itimerspec.as_mut_ptr().cast::<c::itimerspec>()
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 bitflags! {
     /// `TFD_*` flags for use with [`timerfd_create`].
     ///
@@ -91,7 +91,7 @@ bitflags! {
     }
 }
 
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 bitflags! {
     /// `TFD_TIMER_*` flags for use with [`timerfd_settime`].
     ///
@@ -104,7 +104,7 @@ bitflags! {
         const ABSTIME = bitcast!(c::TFD_TIMER_ABSTIME);
 
         /// `TFD_TIMER_CANCEL_ON_SET`
-        #[cfg(linux_kernel)]
+        #[cfg(any(linux_kernel, target_os = "freebsd"))]
         #[doc(alias = "TFD_TIMER_CANCEL_ON_SET")]
         const CANCEL_ON_SET = bitcast!(c::TFD_TIMER_CANCEL_ON_SET);
 
@@ -116,7 +116,7 @@ bitflags! {
 /// `CLOCK_*` constants for use with [`timerfd_create`].
 ///
 /// [`timerfd_create`]: crate::time::timerfd_create
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 #[repr(u32)]
 #[non_exhaustive]
@@ -153,6 +153,7 @@ pub enum TimerfdClockId {
     /// This clock is like `Realtime`, but can wake up a suspended system.
     ///
     /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[cfg(linux_kernel)]
     #[doc(alias = "CLOCK_REALTIME_ALARM")]
     RealtimeAlarm = bitcast!(c::CLOCK_REALTIME_ALARM),
 
@@ -161,6 +162,7 @@ pub enum TimerfdClockId {
     /// This clock is like `Boottime`, but can wake up a suspended system.
     ///
     /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
     #[doc(alias = "CLOCK_BOOTTIME_ALARM")]
     BoottimeAlarm = bitcast!(c::CLOCK_BOOTTIME_ALARM),
 }
@@ -170,7 +172,7 @@ mod tests {
     #[allow(unused_imports)]
     use super::*;
 
-    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
+    #[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
     #[test]
     fn test_types() {
         assert_eq_size!(TimerfdFlags, c::c_int);

src/clockid.rs

@@ -145,7 +145,7 @@ pub enum DynamicClockId<'a> {
     Dynamic(BorrowedFd<'a>),
 
     /// `CLOCK_REALTIME_ALARM`
-    #[cfg(linux_kernel)]
+    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
     #[doc(alias = "CLOCK_REALTIME_ALARM")]
     RealtimeAlarm,
 

src/time/mod.rs

@@ -1,11 +1,11 @@
 //! Time-related operations.
 
 mod clock;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 mod timerfd;
 
 // TODO: Convert WASI'S clock APIs to use handles rather than ambient clock
 // identifiers, update `wasi-libc`, and then add support in `rustix`.
 pub use clock::*;
-#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 pub use timerfd::*;

tests/time/main.rs

@@ -14,7 +14,7 @@ mod monotonic;
     all(apple, not(target_os = "macos"))
 )))]
 mod settime;
-#[cfg(linux_kernel)]
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
 mod timerfd;
 mod timespec;
 #[cfg(not(any(target_os = "redox", target_os = "wasi")))]