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srandomdev.c

/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006 Linpro AS
 * All rights reserved.
 *
 * Author: Dag-Erling Smørgrav <des@linpro.no>
 *
 * 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 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 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.
 *
 * $Id: srandomdev.c 1096 2006-09-20 07:50:27Z des $
 */

#ifndef HAVE_SRANDOMDEV

#include <sys/time.h>

#include <fcntl.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#include "compat/srandomdev.h"

void
srandomdev(void)
{
      struct timeval tv;
      unsigned int seed;
      int fd;

      if ((fd = open("/dev/random", O_RDONLY)) >= 0) {
            read(fd, &seed, sizeof seed);
            close(fd);
      } else {
            gettimeofday(&tv, NULL);
            /* NOTE: intentional use of uninitialized variable */
            seed ^= (getpid() << 16) ^ tv.tv_sec ^ tv.tv_usec;
      }
      srandom(seed);
}
#endif

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