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