Function libuv_sys::uv_fs_sendfile

pub unsafe extern "C" fn uv_fs_sendfile(
    loop_: *mut uv_loop_t, 
    req: *mut uv_fs_t, 
    out_fd: uv_file, 
    in_fd: uv_file, 
    in_offset: int64_t, 
    length: size_t, 
    cb: uv_fs_cb
) -> c_int