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/// Set current timer via a file descriptor.
///
/// # Examples
///
/// ```
/// let ret = unsafe { nc::timerfd_create(nc::CLOCK_MONOTONIC, nc::TFD_CLOEXEC) };
/// assert!(ret.is_ok());
/// let fd = ret.unwrap();
///
/// let flags = 0;
/// let time = nc::itimerspec_t {
/// it_interval: nc::timespec_t::default(),
/// it_value: nc::timespec_t {
/// tv_sec: 1,
/// tv_nsec: 0,
/// },
/// };
/// let ret = unsafe { nc::timerfd_settime(fd, flags, &time, None) };
/// assert!(ret.is_ok());
///
/// let ret = unsafe { nc::close(fd) };
/// assert!(ret.is_ok());
/// ```
pub unsafe fn timerfd_settime(
ufd: i32,
flags: i32,
new_value: &itimerspec_t,
old_value: Option<&mut itimerspec_t>,
) -> Result<(), Errno> {
let ufd = ufd as usize;
let flags = flags as usize;
let new_value_ptr = core::ptr::from_ref(new_value) as usize;
let old_value_ptr = old_value.map_or(
core::ptr::null_mut::<itimerspec_t>() as usize,
|old_value| core::ptr::from_mut(old_value) as usize,
);
unsafe {
syscall4(
SYS_TIMERFD_SETTIME,
ufd,
flags,
new_value_ptr,
old_value_ptr,
)
.map(drop)
}
}