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