sourceturner
55 lines
1.6 KiB
Rust
55 lines
1.6 KiB
Rust
//! `sys/timeb.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/timeb.h.html>.
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//!
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//! # Deprecation
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//! The `ftime()` function was marked as legacy in the Open Group Base
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//! Specifications Issue 6, and the entire `sys/timeb.h` header was removed in
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//! Issue 7.
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use core::ptr::NonNull;
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use crate::{
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header::sys_time::{gettimeofday, timeval, timezone},
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platform::types::{c_int, c_short, c_ushort, time_t},
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};
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/// See <https://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/timeb.h.html>.
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#[repr(C)]
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#[derive(Default)]
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pub struct timeb {
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pub time: time_t,
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pub millitm: c_ushort,
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pub timezone: c_short,
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pub dstflag: c_short,
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}
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/// See <https://pubs.opengroup.org/onlinepubs/009695399/functions/ftime.html>.
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///
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/// # Safety
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/// The caller must ensure that `tp` is convertible to a `&mut
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/// MaybeUninit<timeb>`.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn ftime(tp: *mut timeb) -> c_int {
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// SAFETY: the caller is required to ensure that the pointer is valid.
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let tp_maybe_uninit = unsafe { NonNull::new_unchecked(tp).as_uninit_mut() };
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let mut tv = timeval::default();
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let mut tz = timezone::default();
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// SAFETY: tv and tz are created above, and thus will coerce to valid
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// pointers.
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if unsafe { gettimeofday(&mut tv, &mut tz) } < 0 {
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return -1;
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}
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tp_maybe_uninit.write(timeb {
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time: tv.tv_sec,
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millitm: (tv.tv_usec / 1000) as c_ushort,
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timezone: tz.tz_minuteswest as c_short,
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dstflag: tz.tz_dsttime as c_short,
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});
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0
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}
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