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  */
44 static constraint_handler_t *_ch = NULL;
45 static pthread_mutex_t ch_lock = PTHREAD_MUTEX_INITIALIZER;
46 
47 constraint_handler_t
48 set_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 
71 void
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 
85 void
86 abort_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 
97 void
98 ignore_handler_s(const char * restrict msg __unused,
99     void * restrict ptr __unused, errno_t error __unused)
100 {
101 }
102