Function rustix::backend::fs::syscalls::copy_file_range

source ยท 
pub(crate) fn copy_file_range(
    fd_in: BorrowedFd<'_>,
    off_in: Option<&mut u64>,
    fd_out: BorrowedFd<'_>,
    off_out: Option<&mut u64>,
    len: usize,
) -> Result<usize>