time/settime.c

/*	A part of the Windows CE C Extra Library (celibc)
	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 <errno.h>
#include <windows.h>
#include <shared.h>

int clock_settime(clockid_t clock_id, const struct timespec *tp) {
	if(!tp) {
		errno = EFAULT;
		return -1;
	}
	switch(clock_id) {
		case CLOCK_REALTIME: {
			FILETIME ft;
			SYSTEMTIME st;
			__timespec_to_filetime(tp, &ft);
			if(!FileTimeToSystemTime(&ft, &st)) return -1;
			if(!SetSystemTime(&st)) return -1;
			return 0;
		}
		case CLOCK_MONOTONIC:
			errno = EPERM;
			return -1;
		default:
			errno = EINVAL;
			return -1;
	}
}