kqueue 1.2.1

kqueue interface for BSDs
Documentation 
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use std::time::Duration;

use libc::{c_long, time_t, timespec};

#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
type NSec = i64;
#[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
type NSec = c_long;

pub(crate) fn duration_to_timespec(d: Duration) -> timespec {
    // this is already checked below
    #[allow(clippy::cast_possible_wrap)]
    let tv_sec = d.as_secs() as time_t;
    #[allow(clippy::cast_lossless)] // this is necessary for i686 fbsd and similar targets
    let tv_nanos = d.subsec_nanos() as NSec;

    assert!(!tv_sec.is_negative(), "Duration seconds is negative");
    assert!(!tv_nanos.is_negative(), "Duration nsecs is negative");

    timespec {
        tv_sec,
        tv_nsec: tv_nanos,
    }
}

#[cfg(test)]
mod tests {
    use std::time::Duration;

    use super::duration_to_timespec;

    #[test]
    fn test_basic_duration_to_ts() {
        let d = Duration::new(4, 20);

        let ts = duration_to_timespec(d);

        assert_eq!(ts.tv_sec, 4);
        assert_eq!(ts.tv_nsec, 20);
    }

    #[test]
    #[should_panic]
    fn test_overflow() {
        let d = Duration::new(i64::MAX as u64 + 1, u32::MAX);
        let ts = duration_to_timespec(d);

        assert_eq!(ts.tv_sec, 1);
        assert_eq!(ts.tv_nsec, 1);
    }
}