453 lines
14 KiB
Rust
453 lines
14 KiB
Rust
//! libc syscalls supporting `rustix::time`.
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use crate::backend::c;
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use crate::backend::conv::ret;
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(feature = "time")]
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#[cfg(any(all(target_env = "gnu", fix_y2038), not(fix_y2038)))]
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use crate::backend::time::types::LibcItimerspec;
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#[cfg(not(target_os = "wasi"))]
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use crate::clockid::{ClockId, DynamicClockId};
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use crate::io;
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#[cfg(all(target_env = "gnu", fix_y2038))]
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use crate::timespec::LibcTimespec;
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use crate::timespec::Timespec;
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use core::mem::MaybeUninit;
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(feature = "time")]
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use {
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crate::backend::conv::{borrowed_fd, ret_owned_fd},
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crate::fd::{BorrowedFd, OwnedFd},
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crate::time::{Itimerspec, TimerfdClockId, TimerfdFlags, TimerfdTimerFlags},
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};
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#[cfg(all(target_env = "gnu", fix_y2038))]
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weak!(fn __clock_gettime64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
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#[cfg(all(target_env = "gnu", fix_y2038))]
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weak!(fn __clock_settime64(c::clockid_t, *const LibcTimespec) -> c::c_int);
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#[cfg(all(target_env = "gnu", fix_y2038))]
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weak!(fn __clock_getres64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(all(target_env = "gnu", fix_y2038))]
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#[cfg(feature = "time")]
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weak!(fn __timerfd_gettime64(c::c_int, *mut LibcItimerspec) -> c::c_int);
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(all(target_env = "gnu", fix_y2038))]
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#[cfg(feature = "time")]
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weak!(fn __timerfd_settime64(c::c_int, c::c_int, *const LibcItimerspec, *mut LibcItimerspec) -> c::c_int);
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#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
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#[inline]
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#[must_use]
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pub(crate) fn clock_getres(id: ClockId) -> Timespec {
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// Old 32-bit version: libc has `clock_getres` but it is not y2038 safe by
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// default. But there may be a `__clock_getres64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_clock_getres) = __clock_getres64.get() {
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let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
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unsafe {
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ret(libc_clock_getres(id as c::clockid_t, timespec.as_mut_ptr())).unwrap();
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return timespec.assume_init().into();
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}
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}
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clock_getres_old(id)
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}
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// Main version: libc is y2038 safe and has `clock_getres`.
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#[cfg(not(fix_y2038))]
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unsafe {
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let mut timespec = MaybeUninit::<Timespec>::uninit();
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let _ = c::clock_getres(id as c::clockid_t, timespec.as_mut_ptr());
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timespec.assume_init()
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}
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}
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#[cfg(fix_y2038)]
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#[must_use]
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fn clock_getres_old(id: ClockId) -> Timespec {
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let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
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let old_timespec = unsafe {
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ret(c::clock_getres(
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id as c::clockid_t,
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old_timespec.as_mut_ptr(),
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))
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.unwrap();
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old_timespec.assume_init()
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};
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Timespec {
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tv_sec: old_timespec.tv_sec.into(),
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tv_nsec: old_timespec.tv_nsec.into(),
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}
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}
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#[cfg(not(target_os = "wasi"))]
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#[inline]
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#[must_use]
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pub(crate) fn clock_gettime(id: ClockId) -> Timespec {
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// Old 32-bit version: libc has `clock_gettime` but it is not y2038 safe by
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// default. But there may be a `__clock_gettime64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_clock_gettime) = __clock_gettime64.get() {
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let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
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unsafe {
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ret(libc_clock_gettime(
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id as c::clockid_t,
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timespec.as_mut_ptr(),
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))
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.unwrap();
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return timespec.assume_init().into();
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}
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}
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clock_gettime_old(id)
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}
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// Use `.unwrap()` here because `clock_getres` can fail if the clock itself
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// overflows a number of seconds, but if that happens, the monotonic clocks
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// can't maintain their invariants, or the realtime clocks aren't properly
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// configured.
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#[cfg(not(fix_y2038))]
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unsafe {
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let mut timespec = MaybeUninit::<Timespec>::uninit();
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ret(c::clock_gettime(id as c::clockid_t, timespec.as_mut_ptr())).unwrap();
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timespec.assume_init()
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}
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}
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#[cfg(fix_y2038)]
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#[must_use]
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fn clock_gettime_old(id: ClockId) -> Timespec {
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let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
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let old_timespec = unsafe {
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ret(c::clock_gettime(
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id as c::clockid_t,
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old_timespec.as_mut_ptr(),
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))
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.unwrap();
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old_timespec.assume_init()
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};
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Timespec {
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tv_sec: old_timespec.tv_sec.into(),
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tv_nsec: old_timespec.tv_nsec.into(),
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}
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}
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#[cfg(not(target_os = "wasi"))]
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#[inline]
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pub(crate) fn clock_gettime_dynamic(id: DynamicClockId<'_>) -> io::Result<Timespec> {
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let id: c::clockid_t = match id {
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DynamicClockId::Known(id) => id as c::clockid_t,
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#[cfg(linux_kernel)]
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DynamicClockId::Dynamic(fd) => {
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use crate::fd::AsRawFd;
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const CLOCKFD: i32 = 3;
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(!fd.as_raw_fd() << 3) | CLOCKFD
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}
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#[cfg(not(linux_kernel))]
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DynamicClockId::Dynamic(_fd) => {
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// Dynamic clocks are not supported on this platform.
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return Err(io::Errno::INVAL);
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}
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#[cfg(linux_kernel)]
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DynamicClockId::RealtimeAlarm => c::CLOCK_REALTIME_ALARM,
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#[cfg(linux_kernel)]
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DynamicClockId::Tai => c::CLOCK_TAI,
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#[cfg(any(
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freebsdlike,
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linux_kernel,
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target_os = "fuchsia",
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target_os = "openbsd"
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))]
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DynamicClockId::Boottime => c::CLOCK_BOOTTIME,
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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DynamicClockId::BoottimeAlarm => c::CLOCK_BOOTTIME_ALARM,
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};
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// Old 32-bit version: libc has `clock_gettime` but it is not y2038
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// safe by default. But there may be a `__clock_gettime64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_clock_gettime) = __clock_gettime64.get() {
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let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
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unsafe {
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ret(libc_clock_gettime(
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id as c::clockid_t,
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timespec.as_mut_ptr(),
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))?;
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return Ok(timespec.assume_init().into());
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}
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}
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clock_gettime_dynamic_old(id)
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}
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// Main version: libc is y2038 safe and has `clock_gettime`.
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#[cfg(not(fix_y2038))]
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unsafe {
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let mut timespec = MaybeUninit::<Timespec>::uninit();
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ret(c::clock_gettime(id as c::clockid_t, timespec.as_mut_ptr()))?;
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Ok(timespec.assume_init())
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}
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}
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#[cfg(fix_y2038)]
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#[inline]
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fn clock_gettime_dynamic_old(id: c::clockid_t) -> io::Result<Timespec> {
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let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
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let old_timespec = unsafe {
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ret(c::clock_gettime(
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id as c::clockid_t,
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old_timespec.as_mut_ptr(),
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))?;
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old_timespec.assume_init()
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};
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Ok(Timespec {
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tv_sec: old_timespec.tv_sec.into(),
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tv_nsec: old_timespec.tv_nsec.into(),
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})
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}
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#[cfg(not(any(
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target_os = "redox",
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target_os = "wasi",
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all(apple, not(target_os = "macos"))
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)))]
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#[inline]
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pub(crate) fn clock_settime(id: ClockId, timespec: Timespec) -> io::Result<()> {
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// Old 32-bit version: libc has `clock_gettime` but it is not y2038 safe by
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// default. But there may be a `__clock_settime64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_clock_settime) = __clock_settime64.get() {
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unsafe {
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let mut new_timespec = core::mem::zeroed::<LibcTimespec>();
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new_timespec.tv_sec = timespec.tv_sec;
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new_timespec.tv_nsec = timespec.tv_nsec as _;
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return ret(libc_clock_settime(id as c::clockid_t, &new_timespec));
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}
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}
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clock_settime_old(id, timespec)
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}
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// Main version: libc is y2038 safe and has `clock_settime`.
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#[cfg(not(fix_y2038))]
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unsafe {
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ret(c::clock_settime(id as c::clockid_t, ×pec))
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}
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}
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#[cfg(not(any(
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target_os = "redox",
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target_os = "wasi",
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all(apple, not(target_os = "macos"))
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)))]
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#[cfg(fix_y2038)]
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fn clock_settime_old(id: ClockId, timespec: Timespec) -> io::Result<()> {
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let old_timespec = c::timespec {
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tv_sec: timespec
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: timespec.tv_nsec as _,
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};
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unsafe { ret(c::clock_settime(id as c::clockid_t, &old_timespec)) }
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}
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(feature = "time")]
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pub(crate) fn timerfd_create(id: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {
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unsafe { ret_owned_fd(c::timerfd_create(id as c::clockid_t, bitflags_bits!(flags))) }
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}
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(feature = "time")]
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pub(crate) fn timerfd_settime(
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fd: BorrowedFd<'_>,
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flags: TimerfdTimerFlags,
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new_value: &Itimerspec,
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) -> io::Result<Itimerspec> {
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// Old 32-bit version: libc has `timerfd_settime` but it is not y2038 safe
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// by default. But there may be a `__timerfd_settime64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_timerfd_settime) = __timerfd_settime64.get() {
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let mut result = MaybeUninit::<LibcItimerspec>::uninit();
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unsafe {
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ret(libc_timerfd_settime(
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borrowed_fd(fd),
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bitflags_bits!(flags),
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&new_value.clone().into(),
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result.as_mut_ptr(),
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))?;
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return Ok(result.assume_init().into());
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}
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}
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timerfd_settime_old(fd, flags, new_value)
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}
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#[cfg(not(fix_y2038))]
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unsafe {
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let mut result = MaybeUninit::<LibcItimerspec>::uninit();
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ret(c::timerfd_settime(
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borrowed_fd(fd),
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bitflags_bits!(flags),
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new_value,
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result.as_mut_ptr(),
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))?;
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Ok(result.assume_init())
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}
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}
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(fix_y2038)]
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#[cfg(feature = "time")]
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fn timerfd_settime_old(
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fd: BorrowedFd<'_>,
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flags: TimerfdTimerFlags,
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new_value: &Itimerspec,
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) -> io::Result<Itimerspec> {
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let mut old_result = MaybeUninit::<c::itimerspec>::uninit();
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// Convert `new_value` to the old `itimerspec` format.
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let old_new_value = c::itimerspec {
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it_interval: c::timespec {
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tv_sec: new_value
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.it_interval
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: new_value
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.it_interval
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.tv_nsec
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.try_into()
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.map_err(|_| io::Errno::INVAL)?,
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},
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it_value: c::timespec {
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tv_sec: new_value
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.it_value
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: new_value
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.it_value
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.tv_nsec
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.try_into()
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.map_err(|_| io::Errno::INVAL)?,
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},
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};
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let old_result = unsafe {
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ret(c::timerfd_settime(
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borrowed_fd(fd),
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bitflags_bits!(flags),
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&old_new_value,
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old_result.as_mut_ptr(),
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))?;
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old_result.assume_init()
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};
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Ok(Itimerspec {
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it_interval: Timespec {
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tv_sec: old_result
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.it_interval
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: old_result.it_interval.tv_nsec as _,
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},
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it_value: Timespec {
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tv_sec: old_result
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.it_interval
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: old_result.it_interval.tv_nsec as _,
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},
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})
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}
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(feature = "time")]
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pub(crate) fn timerfd_gettime(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
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// Old 32-bit version: libc has `timerfd_gettime` but it is not y2038 safe
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// by default. But there may be a `__timerfd_gettime64` we can use.
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#[cfg(fix_y2038)]
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{
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#[cfg(target_env = "gnu")]
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if let Some(libc_timerfd_gettime) = __timerfd_gettime64.get() {
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let mut result = MaybeUninit::<LibcItimerspec>::uninit();
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unsafe {
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ret(libc_timerfd_gettime(borrowed_fd(fd), result.as_mut_ptr()))?;
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return Ok(result.assume_init().into());
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}
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}
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timerfd_gettime_old(fd)
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}
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#[cfg(not(fix_y2038))]
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unsafe {
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let mut result = MaybeUninit::<LibcItimerspec>::uninit();
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ret(c::timerfd_gettime(borrowed_fd(fd), result.as_mut_ptr()))?;
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Ok(result.assume_init())
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}
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}
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#[cfg(any(linux_kernel, target_os = "fuchsia"))]
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#[cfg(fix_y2038)]
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#[cfg(feature = "time")]
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fn timerfd_gettime_old(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
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let mut old_result = MaybeUninit::<c::itimerspec>::uninit();
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let old_result = unsafe {
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ret(c::timerfd_gettime(borrowed_fd(fd), old_result.as_mut_ptr()))?;
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old_result.assume_init()
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};
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Ok(Itimerspec {
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it_interval: Timespec {
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tv_sec: old_result
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.it_interval
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: old_result.it_interval.tv_nsec as _,
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},
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it_value: Timespec {
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tv_sec: old_result
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.it_interval
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.tv_sec
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.try_into()
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.map_err(|_| io::Errno::OVERFLOW)?,
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tv_nsec: old_result.it_interval.tv_nsec as _,
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},
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})
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}
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