1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)sigcompat.c 8.1 (Berkeley) 6/2/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include "namespace.h" 36 #include <sys/param.h> 37 #include <errno.h> 38 #include <signal.h> 39 #include <string.h> 40 #include "un-namespace.h" 41 #include "libc_private.h" 42 43 int 44 sigvec(int signo, struct sigvec *sv, struct sigvec *osv) 45 { 46 struct sigaction sa, osa; 47 struct sigaction *sap, *osap; 48 int ret; 49 50 if (sv != NULL) { 51 sa.sa_handler = sv->sv_handler; 52 sa.sa_flags = sv->sv_flags ^ SV_INTERRUPT; 53 sigemptyset(&sa.sa_mask); 54 sa.sa_mask.__bits[0] = sv->sv_mask; 55 sap = &sa; 56 } else 57 sap = NULL; 58 osap = osv != NULL ? &osa : NULL; 59 ret = __libc_sigaction(signo, sap, osap); 60 if (ret == 0 && osv != NULL) { 61 osv->sv_handler = osa.sa_handler; 62 osv->sv_flags = osa.sa_flags ^ SV_INTERRUPT; 63 osv->sv_mask = osa.sa_mask.__bits[0]; 64 } 65 return (ret); 66 } 67 68 int 69 sigsetmask(int mask) 70 { 71 sigset_t set, oset; 72 int n; 73 74 sigemptyset(&set); 75 set.__bits[0] = mask; 76 n = __libc_sigprocmask(SIG_SETMASK, &set, &oset); 77 if (n) 78 return (n); 79 return (oset.__bits[0]); 80 } 81 82 int 83 sigblock(int mask) 84 { 85 sigset_t set, oset; 86 int n; 87 88 sigemptyset(&set); 89 set.__bits[0] = mask; 90 n = __libc_sigprocmask(SIG_BLOCK, &set, &oset); 91 if (n) 92 return (n); 93 return (oset.__bits[0]); 94 } 95 96 int 97 sigpause(int mask) 98 { 99 sigset_t set; 100 101 sigemptyset(&set); 102 set.__bits[0] = mask; 103 return (__libc_sigsuspend(&set)); 104 } 105 106 int 107 xsi_sigpause(int sig) 108 { 109 sigset_t set; 110 111 if (__libc_sigprocmask(SIG_BLOCK, NULL, &set) == -1) 112 return (-1); 113 if (sigdelset(&set, sig) == -1) 114 return (-1); 115 return (__libc_sigsuspend(&set)); 116 } 117 118 int 119 sighold(int sig) 120 { 121 sigset_t set; 122 123 sigemptyset(&set); 124 if (sigaddset(&set, sig) == -1) 125 return (-1); 126 return (__libc_sigprocmask(SIG_BLOCK, &set, NULL)); 127 } 128 129 int 130 sigignore(int sig) 131 { 132 struct sigaction sa; 133 134 bzero(&sa, sizeof(sa)); 135 sa.sa_handler = SIG_IGN; 136 return (__libc_sigaction(sig, &sa, NULL)); 137 } 138 139 int 140 sigrelse(int sig) 141 { 142 sigset_t set; 143 144 sigemptyset(&set); 145 if (sigaddset(&set, sig) == -1) 146 return (-1); 147 return (__libc_sigprocmask(SIG_UNBLOCK, &set, NULL)); 148 } 149 150 void 151 (*sigset(int sig, void (*disp)(int)))(int) 152 { 153 sigset_t set, pset; 154 struct sigaction sa, psa; 155 156 sigemptyset(&set); 157 if (sigaddset(&set, sig) == -1) 158 return (SIG_ERR); 159 if (__libc_sigprocmask(SIG_BLOCK, NULL, &pset) == -1) 160 return (SIG_ERR); 161 if ((__sighandler_t *)disp == SIG_HOLD) { 162 if (__libc_sigprocmask(SIG_BLOCK, &set, &pset) == -1) 163 return (SIG_ERR); 164 if (sigismember(&pset, sig)) 165 return (SIG_HOLD); 166 else { 167 if (__libc_sigaction(sig, NULL, &psa) == -1) 168 return (SIG_ERR); 169 return (psa.sa_handler); 170 } 171 } else { 172 if (__libc_sigprocmask(SIG_UNBLOCK, &set, &pset) == -1) 173 return (SIG_ERR); 174 } 175 176 bzero(&sa, sizeof(sa)); 177 sa.sa_handler = disp; 178 if (__libc_sigaction(sig, &sa, &psa) == -1) 179 return (SIG_ERR); 180 if (sigismember(&pset, sig)) 181 return (SIG_HOLD); 182 else 183 return (psa.sa_handler); 184 } 185