1/*-
2 * Copyright (c) 2017 Juniper Networks.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include "namespace.h"
30#include <sys/types.h>
31#include <machine/atomic.h>
32#include <errno.h>
33#include <pthread.h>
34#include <stddef.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38#include "un-namespace.h"
39#include "libc_private.h"
40
41/*
42 * Rationale recommends allocating new memory each time.
43 */
44static constraint_handler_t *_ch = NULL;
45static pthread_mutex_t ch_lock = PTHREAD_MUTEX_INITIALIZER;
46
47constraint_handler_t
48set_constraint_handler_s(constraint_handler_t handler)
49{
50	constraint_handler_t *new, *old, ret;
51
52	new = malloc(sizeof(constraint_handler_t));
53	if (new == NULL)
54		return (NULL);
55	*new = handler;
56	if (__isthreaded)
57		_pthread_mutex_lock(&ch_lock);
58	old = _ch;
59	_ch = new;
60	if (__isthreaded)
61		_pthread_mutex_unlock(&ch_lock);
62	if (old == NULL) {
63		ret = NULL;
64	} else {
65		ret = *old;
66		free(old);
67	}
68	return (ret);
69}
70
71void
72__throw_constraint_handler_s(const char * restrict msg, errno_t error)
73{
74	constraint_handler_t ch;
75
76	if (__isthreaded)
77		_pthread_mutex_lock(&ch_lock);
78	ch = _ch != NULL ? *_ch : NULL;
79	if (__isthreaded)
80		_pthread_mutex_unlock(&ch_lock);
81	if (ch != NULL)
82		ch(msg, NULL, error);
83}
84
85void
86abort_handler_s(const char * restrict msg, void * restrict ptr __unused,
87    errno_t error __unused)
88{
89	static const char ahs[] = "abort_handler_s : ";
90
91	(void) _write(STDERR_FILENO, ahs, sizeof(ahs) - 1);
92	(void) _write(STDERR_FILENO, msg, strlen(msg));
93	(void) _write(STDERR_FILENO, "\n", 1);
94	abort();
95}
96
97void
98ignore_handler_s(const char * restrict msg __unused,
99    void * restrict ptr __unused, errno_t error __unused)
100{
101}
102