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/// Change time timestamps with nanosecond precision.
///
/// # Examples
///
/// ```
/// let path = "/tmp/nc-utimesat";
/// let ret = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_WRONLY | nc::O_CREAT, 0o644) };
/// assert!(ret.is_ok());
/// let fd = ret.unwrap();
/// let ret = unsafe { nc::close(fd) };
/// assert!(ret.is_ok());
/// let times = [
/// nc::timespec_t {
/// tv_sec: 100,
/// tv_nsec: 0,
/// },
/// nc::timespec_t {
/// tv_sec: 10,
/// tv_nsec: 0,
/// },
/// ];
/// let flags = nc::AT_SYMLINK_NOFOLLOW;
/// let ret = unsafe { nc::utimensat(nc::AT_FDCWD, path, ×, flags) };
/// assert!(ret.is_ok());
/// let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, path, 0) };
/// assert!(ret.is_ok());
/// ```
pub unsafe fn utimensat<P: AsRef<Path>>(
dirfd: i32,
filename: P,
times: &[timespec_t; 2],
flags: i32,
) -> Result<(), Errno> {
let dirfd = dirfd as usize;
let filename = CString::new(filename.as_ref());
let filename_ptr = filename.as_ptr() as usize;
let times_ptr = times.as_ptr() as usize;
let flags = flags as usize;
syscall4(SYS_UTIMENSAT, dirfd, filename_ptr, times_ptr, flags).map(drop)
}