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