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/// Change ownership of a file.
///
/// # Examples
///
/// ```
/// let filename = "/tmp/nc-fchown";
/// let fd = unsafe {
/// nc::openat(
/// nc::AT_FDCWD,
/// filename,
/// nc::O_CREAT | nc::O_WRONLY | nc::O_TRUNC,
/// 0o644
/// )
/// };
/// assert!(fd.is_ok());
/// let fd = fd.unwrap();
/// let ret = unsafe { nc::close(fd) };
/// assert!(ret.is_ok());
/// let ret = unsafe { nc::fchownat(nc::AT_FDCWD, filename, 0, 0, 0) };
/// assert_eq!(ret, Err(nc::EPERM));
/// let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, filename,0 ) };
/// assert!(ret.is_ok());
/// ```
pub unsafe fn fchownat<P: AsRef<Path>>(
dirfd: i32,
filename: P,
user: uid_t,
group: gid_t,
flag: i32,
) -> Result<(), Errno> {
let dirfd = dirfd as usize;
let filename = CString::new(filename.as_ref());
let filename_ptr = filename.as_ptr() as usize;
let user = user as usize;
let group = group as usize;
let flag = flag as usize;
syscall5(SYS_FCHOWNAT, dirfd, filename_ptr, user, group, flag).map(drop)
}