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use rustix::time::{
timerfd_create, timerfd_gettime, timerfd_settime, Itimerspec, TimerfdClockId, TimerfdFlags,
TimerfdTimerFlags, Timespec,
};
#[test]
fn test_timerfd() {
let fd = timerfd_create(TimerfdClockId::Monotonic, TimerfdFlags::CLOEXEC).unwrap();
let set = Itimerspec {
it_interval: Timespec {
tv_sec: 0,
tv_nsec: 0,
},
it_value: Timespec {
tv_sec: 1,
tv_nsec: 2,
},
};
let _old: Itimerspec = timerfd_settime(&fd, TimerfdTimerFlags::ABSTIME, &set).unwrap();
// Wait for the timer to expire.
let mut buf = [0_u8; 8];
assert_eq!(rustix::io::read(&fd, &mut buf), Ok(8));
assert!(u64::from_ne_bytes(buf) >= 1);
let new = timerfd_gettime(&fd).unwrap();
// The timer counts down.
assert_eq!(set.it_interval.tv_sec, new.it_interval.tv_sec);
assert_eq!(set.it_interval.tv_nsec, new.it_interval.tv_nsec);
assert!(new.it_value.tv_sec <= set.it_value.tv_sec);
assert!(
new.it_value.tv_nsec < set.it_value.tv_nsec || new.it_value.tv_sec < set.it_value.tv_sec
);
}
/// Similar, but set an interval for a repeated timer. Don't check that the
/// times are monotonic because that would race with the timer repeating.
#[test]
fn test_timerfd_with_interval() {
let fd = timerfd_create(TimerfdClockId::Monotonic, TimerfdFlags::CLOEXEC).unwrap();
let set = Itimerspec {
it_interval: Timespec {
tv_sec: 0,
tv_nsec: 6,
},
it_value: Timespec {
tv_sec: 1,
tv_nsec: 7,
},
};
let _old: Itimerspec = timerfd_settime(&fd, TimerfdTimerFlags::ABSTIME, &set).unwrap();
// Wait for the timer to expire.
let mut buf = [0_u8; 8];
assert_eq!(rustix::io::read(&fd, &mut buf), Ok(8));
assert!(u64::from_ne_bytes(buf) >= 1);
let new = timerfd_gettime(&fd).unwrap();
assert_eq!(set.it_interval.tv_sec, new.it_interval.tv_sec);
assert_eq!(set.it_interval.tv_nsec, new.it_interval.tv_nsec);
// Wait for the timer to expire again.
let mut buf = [0_u8; 8];
assert_eq!(rustix::io::read(&fd, &mut buf), Ok(8));
assert!(u64::from_ne_bytes(buf) >= 1);
let new = timerfd_gettime(&fd).unwrap();
assert_eq!(set.it_interval.tv_sec, new.it_interval.tv_sec);
assert_eq!(set.it_interval.tv_nsec, new.it_interval.tv_nsec);
}
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