#[cfg(linux_kernel)]

use crate::process::Pid;

use crate::{backend, io};

pub use backend::process::types::Resource;

/// `struct rlimit`—Current and maximum values used in [`getrlimit`],

/// [`setrlimit`], and [`prlimit`].

#[derive(Debug, Clone, Copy, PartialEq, Eq)]

pub struct Rlimit {

    /// Current effective, “soft”, limit.

    pub current: Option<u64>,

    /// Maximum, “hard”, value that `current` may be dynamically increased to.

    pub maximum: Option<u64>,

}

/// `getrlimit(resource)`—Get a process resource limit value.

///

/// # References

///  - [POSIX]

///  - [Linux]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/getrlimit.html

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

#[inline]

pub fn getrlimit(resource: Resource) -> Rlimit {

    backend::process::syscalls::getrlimit(resource)

}

/// `setrlimit(resource, new)`—Set a process resource limit value.

///

/// # References

///  - [POSIX]

///  - [Linux]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/setrlimit.html

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

#[inline]

pub fn setrlimit(resource: Resource, new: Rlimit) -> io::Result<()> {

    backend::process::syscalls::setrlimit(resource, new)

}

/// `prlimit(pid, resource, new)`—Get and set a process resource limit value.

///

/// # References

///  - [Linux]

///

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

#[cfg(linux_kernel)]

#[inline]

pub fn prlimit(pid: Option<Pid>, resource: Resource, new: Rlimit) -> io::Result<Rlimit> {

    backend::process::syscalls::prlimit(pid, resource, new)

}