raise_default_signal.c revision 1.2.2.2
1 1.2.2.2 matt /* $NetBSD: raise_default_signal.c,v 1.2.2.2 2007/11/06 23:12:00 matt Exp $ */ 2 1.2.2.2 matt 3 1.2.2.2 matt /*- 4 1.2.2.2 matt * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 1.2.2.2 matt * All rights reserved. 6 1.2.2.2 matt * 7 1.2.2.2 matt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 matt * by Luke Mewburn. 9 1.2.2.2 matt * 10 1.2.2.2 matt * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 matt * modification, are permitted provided that the following conditions 12 1.2.2.2 matt * are met: 13 1.2.2.2 matt * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 matt * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 matt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 matt * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 matt * documentation and/or other materials provided with the distribution. 18 1.2.2.2 matt * 3. All advertising materials mentioning features or use of this software 19 1.2.2.2 matt * must display the following acknowledgement: 20 1.2.2.2 matt * This product includes software developed by the NetBSD 21 1.2.2.2 matt * Foundation, Inc. and its contributors. 22 1.2.2.2 matt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.2.2 matt * contributors may be used to endorse or promote products derived 24 1.2.2.2 matt * from this software without specific prior written permission. 25 1.2.2.2 matt * 26 1.2.2.2 matt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.2.2 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.2.2 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.2.2 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.2.2 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.2.2 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.2.2 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.2.2 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.2.2 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.2.2 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.2.2 matt * POSSIBILITY OF SUCH DAMAGE. 37 1.2.2.2 matt */ 38 1.2.2.2 matt 39 1.2.2.2 matt #if HAVE_NBTOOL_CONFIG_H 40 1.2.2.2 matt #include "nbtool_config.h" 41 1.2.2.2 matt #endif 42 1.2.2.2 matt 43 1.2.2.2 matt #include <sys/cdefs.h> 44 1.2.2.2 matt #if defined(LIBC_SCCS) && !defined(lint) 45 1.2.2.2 matt __RCSID("$NetBSD: raise_default_signal.c,v 1.2.2.2 2007/11/06 23:12:00 matt Exp $"); 46 1.2.2.2 matt #endif 47 1.2.2.2 matt 48 1.2.2.2 matt #include <errno.h> 49 1.2.2.2 matt #include <signal.h> 50 1.2.2.2 matt #include <stdio.h> 51 1.2.2.2 matt #include <string.h> 52 1.2.2.2 matt #include <util.h> 53 1.2.2.2 matt 54 1.2.2.2 matt #if ! HAVE_RAISE_DEFAULT_SIGNAL 55 1.2.2.2 matt /* 56 1.2.2.2 matt * raise_default_signal sig 57 1.2.2.2 matt * Raise the default signal handler for sig, by 58 1.2.2.2 matt * - block all signals 59 1.2.2.2 matt * - set the signal handler to SIG_DFL 60 1.2.2.2 matt * - raise the signal 61 1.2.2.2 matt * - unblock the signal to deliver it 62 1.2.2.2 matt * 63 1.2.2.2 matt * The original signal mask and signal handler is restored on exit 64 1.2.2.2 matt * (whether successful or not). 65 1.2.2.2 matt * 66 1.2.2.2 matt * Returns 0 on success, or -1 on failure with errno set to 67 1.2.2.2 matt * on of the values for sigemptyset(), sigaddset(), sigprocmask(), 68 1.2.2.2 matt * sigaction(), or raise(). 69 1.2.2.2 matt */ 70 1.2.2.2 matt int 71 1.2.2.2 matt raise_default_signal(int sig) 72 1.2.2.2 matt { 73 1.2.2.2 matt struct sigaction origact, act; 74 1.2.2.2 matt sigset_t origmask, fullmask, mask; 75 1.2.2.2 matt int retval, oerrno; 76 1.2.2.2 matt 77 1.2.2.2 matt retval = -1; 78 1.2.2.2 matt 79 1.2.2.2 matt /* Setup data structures */ 80 1.2.2.2 matt /* XXX memset(3) isn't async-safe according to signal(7) */ 81 1.2.2.2 matt (void)memset(&act, 0, sizeof(act)); 82 1.2.2.2 matt act.sa_handler = SIG_DFL; 83 1.2.2.2 matt act.sa_flags = 0; 84 1.2.2.2 matt if ((sigemptyset(&act.sa_mask) == -1) || 85 1.2.2.2 matt (sigfillset(&fullmask) == -1) || 86 1.2.2.2 matt (sigemptyset(&mask) == -1) || 87 1.2.2.2 matt (sigaddset(&mask, sig) == -1)) 88 1.2.2.2 matt goto restore_none; 89 1.2.2.2 matt 90 1.2.2.2 matt /* Block all signals */ 91 1.2.2.2 matt if (sigprocmask(SIG_BLOCK, &fullmask, &origmask) == -1) 92 1.2.2.2 matt goto restore_none; 93 1.2.2.2 matt /* (use 'goto restore_mask' to restore state) */ 94 1.2.2.2 matt 95 1.2.2.2 matt /* Enable the SIG_DFL handler */ 96 1.2.2.2 matt if (sigaction(sig, &act, &origact) == -1) 97 1.2.2.2 matt goto restore_mask; 98 1.2.2.2 matt /* (use 'goto restore_act' to restore state) */ 99 1.2.2.2 matt 100 1.2.2.2 matt /* Raise the signal, and unblock the signal to deliver it */ 101 1.2.2.2 matt if ((raise(sig) == -1) || 102 1.2.2.2 matt (sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1)) 103 1.2.2.2 matt goto restore_act; 104 1.2.2.2 matt 105 1.2.2.2 matt /* Flag successful raise() */ 106 1.2.2.2 matt retval = 0; 107 1.2.2.2 matt 108 1.2.2.2 matt /* Restore the original handler */ 109 1.2.2.2 matt restore_act: 110 1.2.2.2 matt oerrno = errno; 111 1.2.2.2 matt (void)sigaction(sig, &origact, NULL); 112 1.2.2.2 matt errno = oerrno; 113 1.2.2.2 matt 114 1.2.2.2 matt /* Restore the original mask */ 115 1.2.2.2 matt restore_mask: 116 1.2.2.2 matt oerrno = errno; 117 1.2.2.2 matt (void)sigprocmask(SIG_SETMASK, &origmask, NULL); 118 1.2.2.2 matt errno = oerrno; 119 1.2.2.2 matt 120 1.2.2.2 matt restore_none: 121 1.2.2.2 matt return retval; 122 1.2.2.2 matt } 123 1.2.2.2 matt 124 1.2.2.2 matt #endif /* ! HAVE_RAISE_DEFAULT_SIGNAL */ 125
Indexes created Tue Sep 30 11:09:46 GMT 2025