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/// Get value of an interval timer.
///
/// # Example
///
/// ```
/// use core::mem::size_of;
///
/// fn handle_alarm(signum: i32) {
/// assert_eq!(signum, nc::SIGALRM);
/// let msg = "Hello alarm";
/// let _ = unsafe { nc::write(2, msg.as_ptr() as usize, msg.len()) };
/// }
///
/// let sa = nc::sigaction_t {
/// sa_handler: handle_alarm as nc::sighandler_t,
/// sa_flags: 0,
/// ..nc::sigaction_t::default()
/// };
/// let mut old_sa = nc::sigaction_t::default();
/// let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, &sa, &mut old_sa, size_of::<nc::sigset_t>()) };
/// assert!(ret.is_ok());
///
/// // Single shot timer, actived after 1 second.
/// let itv = nc::itimerval_t {
/// it_value: nc::timeval_t {
/// tv_sec: 1,
/// tv_usec: 0,
/// },
/// it_interval: nc::timeval_t {
/// tv_sec: 0,
/// tv_usec: 0,
/// },
/// };
/// let mut prev_itv = nc::itimerval_t::default();
/// let ret = unsafe { nc::setitimer(nc::ITIMER_REAL, &itv, &mut prev_itv) };
/// assert!(ret.is_ok());
///
/// let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
/// assert!(ret.is_ok());
/// assert!(prev_itv.it_value.tv_sec <= itv.it_value.tv_sec);
///
/// let mask = nc::sigset_t::default();
/// let _ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
///
/// let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
/// assert!(ret.is_ok());
/// assert_eq!(prev_itv.it_value.tv_sec, 0);
/// assert_eq!(prev_itv.it_value.tv_usec, 0);
/// ```
pub unsafe fn getitimer(which: i32, curr_val: &mut itimerval_t) -> Result<(), Errno> {
let which = which as usize;
let curr_val_ptr = curr_val as *mut itimerval_t as usize;
syscall2(SYS_GETITIMER, which, curr_val_ptr).map(drop)
}