clock_settime.c

来自「ucLinux is a very good embeded sytem. Mo」· C语言 代码 · 共 54 行

/*
 * clock_settime() for uClibc
 *
 * Copyright (C) 2005 by Peter Kjellerstedt <[e-mail]>
 *
 * This program 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 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 Library General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#define _GNU_SOURCE
#include "syscalls.h"
#include <time.h>
#include <sys/time.h>

#ifdef __NR_clock_settime
_syscall2(int, clock_settime, clockid_t, clock_id, const struct timespec*, tp);
#else
int clock_settime(clockid_t clock_id, const struct timespec* tp)
{
	struct timeval tv;
	int retval = -1;

	if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) {
		errno = EINVAL;
		return -1;
	}

	switch (clock_id) {
		case CLOCK_REALTIME:
			TIMESPEC_TO_TIMEVAL(&tv, tp);
			retval = settimeofday(&tv, NULL);
			break;

		default:
			errno = EINVAL;
			break;
	}

	return retval;
}
#endif