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
set_constraint_handler_s(constraint_handler_t handler)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
__throw_constraint_handler_s(const char * restrict msg,errno_t error)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
abort_handler_s(const char * restrict msg,void * restrict ptr __unused,errno_t error __unused)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
ignore_handler_s(const char * restrict msg __unused,void * restrict ptr __unused,errno_t error __unused)98 ignore_handler_s(const char * restrict msg __unused,
99 void * restrict ptr __unused, errno_t error __unused)
100 {
101 }
102