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 * $FreeBSD: head/lib/libc/stdlib/set_constraint_handler_s.c 322427 2017-08-12 15:18:17Z kib $
26 */
27
28 #include "namespace.h"
29 #include <sys/types.h>
30 #include <machine/atomic.h>
31 #include <errno.h>
32 #include <pthread.h>
33 #include <stddef.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include "un-namespace.h"
38 #include "libc_private.h"
39
40 /*
41 * Rationale recommends allocating new memory each time.
42 */
43 static constraint_handler_t *_ch = NULL;
44 static pthread_mutex_t ch_lock = PTHREAD_MUTEX_INITIALIZER;
45
46 constraint_handler_t
set_constraint_handler_s(constraint_handler_t handler)47 set_constraint_handler_s(constraint_handler_t handler)
48 {
49 constraint_handler_t *new, *old, ret;
50
51 new = malloc(sizeof(constraint_handler_t));
52 if (new == NULL)
53 return (NULL);
54 *new = handler;
55 if (__isthreaded)
56 _pthread_mutex_lock(&ch_lock);
57 old = _ch;
58 _ch = new;
59 if (__isthreaded)
60 _pthread_mutex_unlock(&ch_lock);
61 if (old == NULL) {
62 ret = NULL;
63 } else {
64 ret = *old;
65 free(old);
66 }
67 return (ret);
68 }
69
70 void
__throw_constraint_handler_s(const char * restrict msg,errno_t error)71 __throw_constraint_handler_s(const char * restrict msg, errno_t error)
72 {
73 constraint_handler_t ch;
74
75 if (__isthreaded)
76 _pthread_mutex_lock(&ch_lock);
77 ch = _ch != NULL ? *_ch : NULL;
78 if (__isthreaded)
79 _pthread_mutex_unlock(&ch_lock);
80 if (ch != NULL)
81 ch(msg, NULL, error);
82 }
83
84 void
abort_handler_s(const char * restrict msg,void * restrict ptr __unused,errno_t error __unused)85 abort_handler_s(const char * restrict msg, void * restrict ptr __unused,
86 errno_t error __unused)
87 {
88 static const char ahs[] = "abort_handler_s : ";
89
90 (void) _write(STDERR_FILENO, ahs, sizeof(ahs) - 1);
91 (void) _write(STDERR_FILENO, msg, strlen(msg));
92 (void) _write(STDERR_FILENO, "\n", 1);
93 abort();
94 }
95
96 void
ignore_handler_s(const char * restrict msg __unused,void * restrict ptr __unused,errno_t error __unused)97 ignore_handler_s(const char * restrict msg __unused,
98 void * restrict ptr __unused, errno_t error __unused)
99 {
100 }
101