Check for fcntl()
[libav.git] / libavutil / random_seed.c
CommitLineData
48d58e59
BC
1/*
2 * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <unistd.h>
22#include <fcntl.h>
23#include "timer.h"
24#include "random_seed.h"
576fb48e 25#include "avutil.h"
48d58e59 26
576fb48e 27uint32_t av_get_random_seed(void)
48d58e59
BC
28{
29 uint32_t seed;
30 int fd;
31
32 if ((fd = open("/dev/random", O_RDONLY)) == -1)
33 fd = open("/dev/urandom", O_RDONLY);
34 if (fd != -1){
49e92878 35 int err = read(fd, &seed, 4);
48d58e59 36 close(fd);
49e92878 37 if (err == 4)
5de91783 38 return seed;
48d58e59
BC
39 }
40#ifdef AV_READ_TIME
41 seed = AV_READ_TIME();
42#endif
43 // XXX what to do ?
44 return seed;
45}
576fb48e
MS
46
47#if LIBAVUTIL_VERSION_MAJOR < 51
48attribute_deprecated uint32_t ff_random_get_seed(void);
49uint32_t ff_random_get_seed(void)
50{
51 return av_get_random_seed();
52}
53#endif