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Use __clock_gettime64 on 32-bit linux-gnu

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This commit is contained in:
Josh Stone 2022-03-09 12:41:47 -08:00
parent bee923f0df
commit 97b49a0cc5
1 changed files with 27 additions and 0 deletions
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27
library/std/src/sys/unix/time.rs
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@ -339,6 +339,33 @@ mod inner {
impl Timespec {
pub fn now(clock: clock_t) -> Timespec {
// Try to use 64-bit time in preparation for Y2038.
#[cfg(all(target_os = "linux", target_env = "gnu", target_pointer_width = "32"))]
{
use crate::sys::weak::weak;
// __clock_gettime64 was added to 32-bit arches in glibc 2.34,
// and it handles both vDSO calls and ENOSYS fallbacks itself.
weak!(fn __clock_gettime64(libc::clockid_t, *mut __timespec64) -> libc::c_int);
#[repr(C)]
struct __timespec64 {
tv_sec: i64,
#[cfg(target_endian = "big")]
_padding: i32,
tv_nsec: i32,
#[cfg(target_endian = "little")]
_padding: i32,
}
if let Some(clock_gettime64) = __clock_gettime64.get() {
let mut t = MaybeUninit::uninit();
cvt(unsafe { clock_gettime64(clock, t.as_mut_ptr()) }).unwrap();
let t = unsafe { t.assume_init() };
return Timespec { tv_sec: t.tv_sec, tv_nsec: t.tv_nsec as i64 };
}
}
let mut t = MaybeUninit::uninit();
cvt(unsafe { libc::clock_gettime(clock, t.as_mut_ptr()) }).unwrap();
Timespec::from(unsafe { t.assume_init() })