nativelibc/time/gettime.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <time.h>
#include <windows.h>
#include <nt.h>
#include <errno.h>
#include <sys/time.h>

int clock_gettime(clockid_t clock_id, struct timespec *tp) {
	if(!tp) {
		errno = EFAULT;
		return -1;
	}
	switch(clock_id) {
		case CLOCK_REALTIME: {
			LARGE_INTEGER li;
			long int status = NtQuerySystemTime(&li);
			if(status < 0) {
				__set_errno_from_ntstatus(status);
				return -1;
			}
			__hurdred_nanoseconds_since_1601_to_timespec(&li, tp);
			return 0;
		}
		case CLOCK_MONOTONIC: {
#if 0			/* NtGetTickCount is not exists in Windows NT 5.1 */
			unsigned long int t = NtGetTickCount();
			tp->tv_sec = t / 1000;
			//tp->tv_nsec = (t - tp->tv_sec * 1000) * 1000000;
			tp->tv_nsec = (t % 1000) * 1000000;
#else
			unsigned long int t = USER_SHARED_DATA->TickCountLow;
			tp->tv_sec = t / 100;
			tp->tv_nsec = (t % 100) * 10000000;
#endif
			return 0;
		}
		default:
			errno = EINVAL;
			return -1;
	}
}