clock_gettime.c

linux环境下用纯c写的RTP协议的通用开发库

/*-------------------------------------------------------------------------
 * clock_gettime.c - clock_gettime
 *-------------------------------------------------------------------------
 */

#ifdef LINUX
#include <errno.h>
#include <sys/time.h>
#include <util.h>

/*-----------------------------------------------------------------------
 * clock_gettime - simulate POSIX call clock_gettime using gettimeofday.
 * clock_gettime is not supported under LINUX 2.2.12-20.
 *-----------------------------------------------------------------------
 */
int
clock_gettime(clockid_t clock_id, struct timespec *ts)
{

	struct timeval tv;
  
	if (clock_id != CLOCK_REALTIME) {
		errno = EINVAL;
		return -1;
	}

	if (gettimeofday(&tv, NULL) < 0) {
		return -1;
	}

	TIMEVAL_TO_TIMESPEC(&tv, ts);
	return 0;
}
#endif /* LINUX */