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src/src/lib/scryptenc/scryptenc_cpuperf.c  view on Meta::CPAN

/*-
 * Copyright 2009 Colin Percival
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file was originally written by Colin Percival as part of the Tarsnap
 * online backup system.
 */
#include "scrypt_platform.h"

#include <sys/time.h>

#include <stdint.h>
#include <stdio.h>
#include <time.h>

#include "crypto_scrypt.h"

#include "scryptenc_cpuperf.h"

#ifdef HAVE_CLOCK_GETTIME

static clock_t clocktouse;

static int
getclockres(double * resd)
{
	struct timespec res;

	/*
	 * Try clocks in order of preference until we find one which works.
	 * (We assume that if clock_getres works, clock_gettime will, too.)
	 * The use of if/else/if/else/if/else rather than if/elif/elif/else
	 * is ugly but legal, and allows us to #ifdef things appropriately.
	 */
#ifdef CLOCK_VIRTUAL
	if (clock_getres(CLOCK_VIRTUAL, &res) == 0)
		clocktouse = CLOCK_VIRTUAL;
	else
#endif
#ifdef CLOCK_MONOTONIC
	if (clock_getres(CLOCK_MONOTONIC, &res) == 0)
		clocktouse = CLOCK_MONOTONIC;
	else
#endif
	if (clock_getres(CLOCK_REALTIME, &res) == 0)
		clocktouse = CLOCK_REALTIME;
	else
		return (-1);

	/* Convert clock resolution to a double. */
	*resd = res.tv_sec + res.tv_nsec * 0.000000001;

	return (0);
}

static int
getclocktime(struct timespec * ts)
{

	if (clock_gettime(clocktouse, ts))
		return (-1);

	return (0);
}

#else