1/* Copyright (c) 2017, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15#include <openssl/rand.h>
16
17#include <stdlib.h>
18
19#include "../fipsmodule/rand/internal.h"
20
21
22// g_buffering_enabled is true if fork-unsafe buffering has been enabled.
23static int g_buffering_enabled = 0;
24
25// g_lock protects |g_buffering_enabled|.
26static struct CRYPTO_STATIC_MUTEX g_lock = CRYPTO_STATIC_MUTEX_INIT;
27
28#if !defined(OPENSSL_WINDOWS)
29void RAND_enable_fork_unsafe_buffering(int fd) {
30 // We no longer support setting the file-descriptor with this function.
31 if (fd != -1) {
32 abort();
33 }
34
35 CRYPTO_STATIC_MUTEX_lock_write(&g_lock);
36 g_buffering_enabled = 1;
37 CRYPTO_STATIC_MUTEX_unlock_write(&g_lock);
38}
39#endif
40
41int rand_fork_unsafe_buffering_enabled(void) {
42 CRYPTO_STATIC_MUTEX_lock_read(&g_lock);
43 const int ret = g_buffering_enabled;
44 CRYPTO_STATIC_MUTEX_unlock_read(&g_lock);
45 return ret;
46}
47