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/// Arm/disarm state of per-process timer.
///
/// # Example
///
/// ```
/// use core::mem::size_of;
///
/// fn handle_alarm(signum: i32) {
/// assert_eq!(signum, nc::SIGALRM);
/// }
///
/// fn main() {
/// const TIMER_SIG: i32 = nc::SIGRTMAX;
///
/// let sa = nc::sigaction_t {
/// sa_flags: nc::SA_SIGINFO,
/// sa_handler: handle_alarm as nc::sighandler_t,
/// ..nc::sigaction_t::default()
/// };
/// let mut old_sa = nc::sigaction_t::default();
/// let ret = unsafe { nc::rt_sigaction(TIMER_SIG, &sa, &mut old_sa, size_of::<nc::sigset_t>()) };
/// assert!(ret.is_ok());
///
/// let tid = nc::itimerspec_t {
/// it_interval: nc::timespec_t::default(),
/// it_value: nc::timespec_t {
/// tv_sec: 1,
/// tv_nsec: 0,
/// },
/// };
/// let mut ev = nc::sigevent_t {
/// sigev_value: nc::sigval_t {
/// sival_ptr: &tid as *const nc::itimerspec_t as usize,
/// },
/// sigev_signo: TIMER_SIG,
/// sigev_notify: nc::SIGEV_SIGNAL,
/// sigev_un: nc::sigev_un_t::default(),
/// };
/// let mut timer_id = nc::timer_t::default();
/// let ret = unsafe { nc::timer_create(nc::CLOCK_MONOTONIC, Some(&mut ev), &mut timer_id) };
/// assert!(ret.is_ok());
/// println!("timer id: {:?}", timer_id);
///
/// 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::timer_settime(timer_id, flags, &time, None) };
/// assert!(ret.is_ok());
///
/// let mut cur_time = nc::itimerspec_t::default();
/// let ret = unsafe { nc::timer_gettime(timer_id, &mut cur_time) };
/// assert!(ret.is_ok());
/// println!("cur time: {:?}", cur_time);
///
/// let mask = nc::sigset_t::default();
/// let _ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
///
/// let ret = unsafe { nc::timer_delete(timer_id) };
/// assert!(ret.is_ok());
/// }
/// ```
pub unsafe fn timer_settime(
timer_id: timer_t,
flags: i32,
new_value: &itimerspec_t,
old_value: Option<&mut itimerspec_t>,
) -> Result<(), Errno> {
let timer_id = timer_id as usize;
let flags = flags as usize;
let new_value_ptr = new_value as *const itimerspec_t as usize;
let old_value_ptr = old_value.map_or(0, |old_value| old_value as *mut itimerspec_t as usize);
syscall4(
SYS_TIMER_SETTIME,
timer_id,
flags,
new_value_ptr,
old_value_ptr,
)
.map(drop)
}