clock_gettime.c

来自「一个嵌入式C库」· C语言 代码 · 共 41 行

/*  Copyright (C) 2003     Justus Pendleton     <[e-mail]>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define _GNU_SOURCE
#include <time.h>
#include <errno.h>
#include <sys/time.h>

int clock_gettime (clockid_t clock, struct timespec* ts)
{
	struct timeval tv;
	int retval = -1;
	switch (clock) {
		case CLOCK_REALTIME:
			retval = gettimeofday (&tv, NULL);
			if (retval == 0) {
				TIMEVAL_TO_TIMESPEC (&tv, ts);
			}
			break;
		default:
			errno = EINVAL;
			break;
	}
	return retval;
}