pub unsafe fn setitimer(
which: i32,
new_val: &itimerval_t,
old_val: &mut itimerval_t
) -> Result<(), Errno>
Expand description
Set value of an interval timer.
§Example
use core::mem::size_of;
fn handle_alarm(signum: i32) {
assert_eq!(signum, nc::SIGALRM);
let msg = "Hello alarm";
let _ = unsafe { nc::write(2, msg.as_ptr() as usize, msg.len()) };
}
let sa = nc::sigaction_t {
sa_handler: handle_alarm as nc::sighandler_t,
sa_flags: 0,
..nc::sigaction_t::default()
};
let mut old_sa = nc::sigaction_t::default();
let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, &sa, &mut old_sa, size_of::<nc::sigset_t>()) };
assert!(ret.is_ok());
// Single shot timer, actived after 1 second.
let itv = nc::itimerval_t {
it_value: nc::timeval_t {
tv_sec: 1,
tv_usec: 0,
},
it_interval: nc::timeval_t {
tv_sec: 0,
tv_usec: 0,
},
};
let mut prev_itv = nc::itimerval_t::default();
let ret = unsafe { nc::setitimer(nc::ITIMER_REAL, &itv, &mut prev_itv) };
assert!(ret.is_ok());
let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
assert!(ret.is_ok());
assert!(prev_itv.it_value.tv_sec <= itv.it_value.tv_sec);
let mask = nc::sigset_t::default();
let _ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
assert!(ret.is_ok());
assert_eq!(prev_itv.it_value.tv_sec, 0);
assert_eq!(prev_itv.it_value.tv_usec, 0);