/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2001, 2012 Oracle and/or its affiliates.  All rights reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 * $Id$
 */

#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);

	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));
}