1/*	$OpenBSD: arc4random_hpux.h,v 1.3 2016/06/30 12:19:51 bcook Exp $	*/
2
3/*
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>
8 *
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.
12 *
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.
20 */
21
22/*
23 * Stub functions for portability.
24 */
25
26#include <sys/mman.h>
27
28#include <pthread.h>
29#include <signal.h>
30
31static 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)
34
35#define _ARC4_ATFORK(f) pthread_atfork(NULL, NULL, (f))
36
37static inline void
38_getentropy_fail(void)
39{
40	raise(SIGKILL);
41}
42
43static volatile sig_atomic_t _rs_forked;
44
45static inline void
46_rs_forkhandler(void)
47{
48	_rs_forked = 1;
49}
50
51static inline void
52_rs_forkdetect(void)
53{
54	static pid_t _rs_pid = 0;
55	pid_t pid = getpid();
56
57	if (_rs_pid == 0 || _rs_pid != pid || _rs_forked) {
58		_rs_pid = pid;
59		_rs_forked = 0;
60		if (rs)
61			memset(rs, 0, sizeof(*rs));
62	}
63}
64
65static inline int
66_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
67{
68	if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
69	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
70		return (-1);
71
72	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
73	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
74		munmap(*rsp, sizeof(**rsp));
75		*rsp = NULL;
76		return (-1);
77	}
78
79	_ARC4_ATFORK(_rs_forkhandler);
80	return (0);
81}
82