use crate::{backend, io};

use backend::fd::AsFd;

/// `sendfile(out_fd, in_fd, offset, count)`—Transfer data between file

/// descriptors.

///

/// # References

///  - [Linux]

///

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

#[cfg(linux_kernel)]

#[inline]

pub fn sendfile<OutFd: AsFd, InFd: AsFd>(

    out_fd: OutFd,

    in_fd: InFd,

    offset: Option<&mut u64>,

    count: usize,

) -> io::Result<usize> {

    backend::fs::syscalls::sendfile(out_fd.as_fd(), in_fd.as_fd(), offset, count)

}