1 /* $OpenBSD: arc4random_freebsd.h,v 1.3 2015/09/11 11:52:55 deraadt Exp $ */
4 * Copyright (c) 1996, David Mazieres <dm@uun.org>
5 * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
6 * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
7 * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * Stub functions for portability.
31 static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
32 #define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx)
33 #define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx)
36 * Unfortunately, pthread_atfork() is broken on FreeBSD (at least 9 and 10) if
37 * a program does not link to -lthr. Callbacks registered with pthread_atfork()
38 * appear to fail silently. So, it is not always possible to detect a PID
41 #define _ARC4_ATFORK(f) pthread_atfork(NULL, NULL, (f))
44 _getentropy_fail(void)
49 static volatile sig_atomic_t _rs_forked;
60 static pid_t _rs_pid = 0;
63 if (_rs_pid == 0 || _rs_pid != pid || _rs_forked) {
67 memset(rs, 0, sizeof(*rs));
72 _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
74 if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
75 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
78 if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
79 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
80 munmap(*rsp, sizeof(**rsp));
85 _ARC4_ATFORK(_rs_forkhandler);