os_clock.c   [plain text]

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2001,2008 Oracle.  All rights reserved.
 *
 * $Id: os_clock.c,v 12.19 2008/02/06 21:30:36 bostic Exp $
 */

#include "db_config.h"

#include "db_int.h"

/*
 * __os_gettime --
 *	Return the current time-of-day clock in seconds and nanoseconds.
 *
 * PUBLIC: void __os_gettime __P((ENV *, db_timespec *, int));
 */
void
__os_gettime(env, tp, monotonic)
	ENV *env;
	db_timespec *tp;
	int monotonic;
{
	const char *sc;
	int ret;

#if defined(HAVE_CLOCK_GETTIME)
#if defined(HAVE_CLOCK_MONOTONIC)
	if (monotonic)
		RETRY_CHK((clock_gettime(
		    CLOCK_MONOTONIC, (struct timespec *)tp)), ret);
	else
#endif
		RETRY_CHK((clock_gettime(
		    CLOCK_REALTIME, (struct timespec *)tp)), ret);

	RETRY_CHK((clock_gettime(CLOCK_REALTIME, (struct timespec *)tp)), ret);
	if (ret != 0) {
		sc = "clock_gettime";
		goto err;
	}
#elif defined(HAVE_GETTIMEOFDAY)
	struct timeval v;

	RETRY_CHK((gettimeofday(&v, NULL)), ret);
	if (ret != 0) {
		sc = "gettimeofday";
		goto err;
	}

	tp->tv_sec = v.tv_sec;
	tp->tv_nsec = v.tv_usec * NS_PER_US;
#elif defined(HAVE_TIME)
	time_t now;

	RETRY_CHK((time(&now) == (time_t)-1 ? 1 : 0), ret);
	if (ret != 0) {
		sc = "time";
		goto err;
	}

	tp->tv_sec = now;
	tp->tv_nsec = 0;
#else
	NO AVAILABLE CLOCK IMPLEMENTATION
#endif
	COMPQUIET(monotonic, 0);
	return;

err:	__db_syserr(env, ret, "%s", sc);
	(void)__env_panic(env, __os_posix_err(ret));
}