Function getitimer

pub unsafe fn getitimer(
    which: i32,
    curr_val: &mut itimerval_t,
) -> Result<(), i32> 

Available on crate feature dep_nc only.

Get value of an interval timer.

Examples

fn handle_alarm(signum: i32) {
    assert_eq!(signum, nc::SIGALRM);
    let msg = b"Hello alarm\n";
    let stderr = 2;
    let _ = unsafe { nc::write(stderr, msg) };
}

#[cfg(nc_has_sa_restorer)]
let sa = nc::sigaction_t {
    sa_handler: handle_alarm as nc::sighandler_t,
    sa_flags: nc::SA_RESTORER | nc::SA_RESTART,
    sa_restorer: nc::restore::get_sa_restorer(),
    ..nc::sigaction_t::default()
};
#[cfg(not(nc_has_sa_restorer))]
let sa = nc::sigaction_t {
    sa_handler: handle_alarm as nc::sighandler_t,
    sa_flags: nc::SA_RESTART,
    ..nc::sigaction_t::default()
};
let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, Some(&sa), None) };
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, Some(&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) };

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);