use crate::fd::{AsFd, OwnedFd};

use crate::timespec::Timespec;

use crate::{backend, io};

pub use backend::time::types::{TimerfdClockId, TimerfdFlags, TimerfdTimerFlags};

/// `struct itimerspec` for use with [`timerfd_gettime`] and

/// [`timerfd_settime`].

///

/// [`timerfd_gettime`]: crate::time::timerfd_gettime

/// [`timerfd_settime`]: crate::time::timerfd_settime

#[derive(Debug, Clone)]

pub struct Itimerspec {

    /// Interval between times.

    pub it_interval: Timespec,

    /// Value of the time.

    pub it_value: Timespec,

}

/// `timerfd_create(clockid, flags)`—Create a timer.

///

/// For a higher-level API to timerfd functionality, see the [timerfd] crate.

///

/// [timerfd]: https://crates.io/crates/timerfd

///

/// # References

///  - [Linux]

///

/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_create.2.html

#[inline]

pub fn timerfd_create(clockid: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {

    backend::time::syscalls::timerfd_create(clockid, flags)

}

/// `timerfd_settime(clockid, flags, new_value)`—Set the time on a timer.

///

/// # References

///  - [Linux]

///

/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_settime.2.html

#[inline]

pub fn timerfd_settime<Fd: AsFd>(

    fd: Fd,

    flags: TimerfdTimerFlags,

    new_value: &Itimerspec,

) -> io::Result<Itimerspec> {

    backend::time::syscalls::timerfd_settime(fd.as_fd(), flags, new_value)

}

/// `timerfd_gettime(clockid, flags)`—Query a timer.

///

/// # References

///  - [Linux]

///

/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_gettime.2.html

#[inline]

pub fn timerfd_gettime<Fd: AsFd>(fd: Fd) -> io::Result<Itimerspec> {

    backend::time::syscalls::timerfd_gettime(fd.as_fd())

}