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/// Change permissions of a file.
///
/// Like `fchmodat()`, with specifying extra `flags`.
///
/// # Examples
///
/// ```
/// let filename = "/tmp/nc-fchmodat2";
/// let fd = unsafe {
/// nc::openat(
/// nc::AT_FDCWD,
/// filename,
/// nc::O_CREAT | nc::O_WRONLY,
/// 0o644
/// )
/// };
/// assert!(fd.is_ok());
/// let fd = fd.unwrap();
/// let ret = unsafe { nc::close(fd) };
/// assert!(ret.is_ok());
/// let ret = unsafe { nc::fchmodat2(nc::AT_FDCWD, filename, 0o600, nc::AT_SYMLINK_NOFOLLOW as u32) };
/// assert!(ret.is_ok());
/// let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, filename, 0) };
/// assert!(ret.is_ok());
/// ```
pub unsafe fn fchmodat2<P: AsRef<Path>>(
dirfd: i32,
filename: P,
mode: mode_t,
flags: u32,
) -> Result<(), Errno> {
let dirfd = dirfd as usize;
let filename = CString::new(filename.as_ref());
let filename_ptr = filename.as_ptr() as usize;
let mode = mode as usize;
let flags = flags as usize;
syscall4(SYS_FCHMODAT, dirfd, filename_ptr, mode, flags).map(drop)
}