- /* $OpenBSD: arc4random_osx.h,v 1.11 2016/06/30 12:19:51 bcook Exp $ */
-
- /*
- * Copyright (c) 1996, David Mazieres <dm@uun.org>
- * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
- * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
- * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
- /*
- * Stub functions for portability.
- */
-
- #include <sys/mman.h>
-
- #include <pthread.h>
- #include <signal.h>
-
- static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
- #define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx)
- #define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx)
-
- #define _ARC4_ATFORK(f) pthread_atfork(NULL, NULL, (f))
-
- static inline void
- _getentropy_fail(void)
- {
- raise(SIGKILL);
- }
-
- static volatile sig_atomic_t _rs_forked;
-
- static inline void
- _rs_forkhandler(void)
- {
- _rs_forked = 1;
- }
-
- static inline void
- _rs_forkdetect(void)
- {
- static pid_t _rs_pid = 0;
- pid_t pid = getpid();
-
- if (_rs_pid == 0 || _rs_pid != pid || _rs_forked) {
- _rs_pid = pid;
- _rs_forked = 0;
- if (rs)
- memset(rs, 0, sizeof(*rs));
- }
- }
-
- static inline int
- _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
- {
- if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
- MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
- return (-1);
-
- if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
- MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
- munmap(*rsp, sizeof(**rsp));
- *rsp = NULL;
- return (-1);
- }
-
- _ARC4_ATFORK(_rs_forkhandler);
- return (0);
- }
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