sigset.c revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: sigset.c,v 1.1.2.2 2003/01/17 05:13:01 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /*- 4 1.1.2.2 thorpej * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 1.1.2.2 thorpej * All rights reserved. 6 1.1.2.2 thorpej * 7 1.1.2.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 thorpej * by Klaus Klein. 9 1.1.2.2 thorpej * 10 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 12 1.1.2.2 thorpej * are met: 13 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.1.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 thorpej * must display the following acknowledgement: 20 1.1.2.2 thorpej * This product includes software developed by the NetBSD 21 1.1.2.2 thorpej * Foundation, Inc. and its contributors. 22 1.1.2.2 thorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 thorpej * contributors may be used to endorse or promote products derived 24 1.1.2.2 thorpej * from this software without specific prior written permission. 25 1.1.2.2 thorpej * 26 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 thorpej */ 38 1.1.2.2 thorpej 39 1.1.2.2 thorpej #include <sys/cdefs.h> 40 1.1.2.2 thorpej #if defined(LIBC_SCCS) && !defined(lint) 41 1.1.2.2 thorpej __RCSID("$NetBSD: sigset.c,v 1.1.2.2 2003/01/17 05:13:01 thorpej Exp $"); 42 1.1.2.2 thorpej #endif 43 1.1.2.2 thorpej 44 1.1.2.2 thorpej #include "namespace.h" 45 1.1.2.2 thorpej #include <errno.h> 46 1.1.2.2 thorpej #include <signal.h> 47 1.1.2.2 thorpej #include <stddef.h> 48 1.1.2.2 thorpej 49 1.1.2.2 thorpej sig_t 50 1.1.2.2 thorpej sigset(int sig, void (*disp)(int)) 51 1.1.2.2 thorpej { 52 1.1.2.2 thorpej sigset_t set, oset; 53 1.1.2.2 thorpej struct sigaction sa, osa; 54 1.1.2.2 thorpej 55 1.1.2.2 thorpej osa.sa_handler = SIG_ERR; 56 1.1.2.2 thorpej 57 1.1.2.2 thorpej if (disp == SIG_HOLD) { 58 1.1.2.2 thorpej /* Add sig to current signal mask. */ 59 1.1.2.2 thorpej if (sigemptyset(&set) != 0) 60 1.1.2.2 thorpej goto out; 61 1.1.2.2 thorpej if (sigaddset(&set, sig) != 0) 62 1.1.2.2 thorpej goto out; 63 1.1.2.2 thorpej if (sigprocmask(SIG_BLOCK, &set, &oset) != 0) 64 1.1.2.2 thorpej goto out; 65 1.1.2.2 thorpej 66 1.1.2.2 thorpej if (sigismember(&oset, sig)) { 67 1.1.2.2 thorpej /* Had been masked before, return SIG_HOLD. */ 68 1.1.2.2 thorpej osa.sa_handler = SIG_HOLD; 69 1.1.2.2 thorpej } else { 70 1.1.2.2 thorpej /* Return previous disposition. */ 71 1.1.2.2 thorpej (void)sigaction(sig, NULL, &osa); 72 1.1.2.2 thorpej } 73 1.1.2.2 thorpej } else if (disp == SIG_ERR) { 74 1.1.2.2 thorpej errno = EINVAL; 75 1.1.2.2 thorpej } else { 76 1.1.2.2 thorpej /* Set up and install new disposition. */ 77 1.1.2.2 thorpej sa.sa_handler = disp; 78 1.1.2.2 thorpej if (sigemptyset(&sa.sa_mask) != 0) 79 1.1.2.2 thorpej goto out; 80 1.1.2.2 thorpej sa.sa_flags = 0; 81 1.1.2.2 thorpej 82 1.1.2.2 thorpej if (sigaction(sig, &sa, &osa) != 0) { 83 1.1.2.2 thorpej osa.sa_handler = SIG_ERR; 84 1.1.2.2 thorpej goto out; 85 1.1.2.2 thorpej } 86 1.1.2.2 thorpej 87 1.1.2.2 thorpej /* Delete sig from current signal mask. */ 88 1.1.2.2 thorpej if (sigemptyset(&set) != 0) 89 1.1.2.2 thorpej return (SIG_ERR); 90 1.1.2.2 thorpej if (sigaddset(&set, sig) != 0) 91 1.1.2.2 thorpej return (SIG_ERR); 92 1.1.2.2 thorpej if (sigprocmask(SIG_UNBLOCK, &set, &oset) != 0) 93 1.1.2.2 thorpej return (SIG_ERR); 94 1.1.2.2 thorpej 95 1.1.2.2 thorpej /* If had been masked before, return SIG_HOLD. */ 96 1.1.2.2 thorpej if (sigismember(&oset, sig)) 97 1.1.2.2 thorpej osa.sa_handler = SIG_HOLD; 98 1.1.2.2 thorpej } 99 1.1.2.2 thorpej 100 1.1.2.2 thorpej out: 101 1.1.2.2 thorpej return (osa.sa_handler); 102 1.1.2.2 thorpej } 103
Indexes created Sun Sep 28 16:09:52 GMT 2025