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 #include "namespace.h" 33 #include <sys/param.h> 34 #include <errno.h> 35 #include <signal.h> 36 #include <string.h> 37 #include "un-namespace.h" 38 #include "libc_private.h" 39 40 int 41 sigvec(int signo, struct sigvec *sv, struct sigvec *osv) 42 { 43 struct sigaction sa, osa; 44 struct sigaction *sap, *osap; 45 int ret; 46 47 if (sv != NULL) { 48 sa.sa_handler = sv->sv_handler; 49 sa.sa_flags = sv->sv_flags ^ SV_INTERRUPT; 50 sigemptyset(&sa.sa_mask); 51 sa.sa_mask.__bits[0] = sv->sv_mask; 52 sap = &sa; 53 } else 54 sap = NULL; 55 osap = osv != NULL ? &osa : NULL; 56 ret = __libc_sigaction(signo, sap, osap); 57 if (ret == 0 && osv != NULL) { 58 osv->sv_handler = osa.sa_handler; 59 osv->sv_flags = osa.sa_flags ^ SV_INTERRUPT; 60 osv->sv_mask = osa.sa_mask.__bits[0]; 61 } 62 return (ret); 63 } 64 65 int 66 sigsetmask(int mask) 67 { 68 sigset_t set, oset; 69 int n; 70 71 sigemptyset(&set); 72 set.__bits[0] = mask; 73 n = __libc_sigprocmask(SIG_SETMASK, &set, &oset); 74 if (n) 75 return (n); 76 return (oset.__bits[0]); 77 } 78 79 int 80 sigblock(int mask) 81 { 82 sigset_t set, oset; 83 int n; 84 85 sigemptyset(&set); 86 set.__bits[0] = mask; 87 n = __libc_sigprocmask(SIG_BLOCK, &set, &oset); 88 if (n) 89 return (n); 90 return (oset.__bits[0]); 91 } 92 93 int 94 sigpause(int mask) 95 { 96 sigset_t set; 97 98 sigemptyset(&set); 99 set.__bits[0] = mask; 100 return (__libc_sigsuspend(&set)); 101 } 102 103 int 104 xsi_sigpause(int sig) 105 { 106 sigset_t set; 107 108 if (__libc_sigprocmask(SIG_BLOCK, NULL, &set) == -1) 109 return (-1); 110 if (sigdelset(&set, sig) == -1) 111 return (-1); 112 return (__libc_sigsuspend(&set)); 113 } 114 115 int 116 sighold(int sig) 117 { 118 sigset_t set; 119 120 sigemptyset(&set); 121 if (sigaddset(&set, sig) == -1) 122 return (-1); 123 return (__libc_sigprocmask(SIG_BLOCK, &set, NULL)); 124 } 125 126 int 127 sigignore(int sig) 128 { 129 struct sigaction sa; 130 131 bzero(&sa, sizeof(sa)); 132 sa.sa_handler = SIG_IGN; 133 return (__libc_sigaction(sig, &sa, NULL)); 134 } 135 136 int 137 sigrelse(int sig) 138 { 139 sigset_t set; 140 141 sigemptyset(&set); 142 if (sigaddset(&set, sig) == -1) 143 return (-1); 144 return (__libc_sigprocmask(SIG_UNBLOCK, &set, NULL)); 145 } 146 147 void 148 (*sigset(int sig, void (*disp)(int)))(int) 149 { 150 sigset_t set, pset; 151 struct sigaction sa, psa; 152 153 sigemptyset(&set); 154 if (sigaddset(&set, sig) == -1) 155 return (SIG_ERR); 156 if (__libc_sigprocmask(SIG_BLOCK, NULL, &pset) == -1) 157 return (SIG_ERR); 158 if ((__sighandler_t *)disp == SIG_HOLD) { 159 if (__libc_sigprocmask(SIG_BLOCK, &set, &pset) == -1) 160 return (SIG_ERR); 161 if (sigismember(&pset, sig)) 162 return (SIG_HOLD); 163 else { 164 if (__libc_sigaction(sig, NULL, &psa) == -1) 165 return (SIG_ERR); 166 return (psa.sa_handler); 167 } 168 } else { 169 if (__libc_sigprocmask(SIG_UNBLOCK, &set, &pset) == -1) 170 return (SIG_ERR); 171 } 172 173 bzero(&sa, sizeof(sa)); 174 sa.sa_handler = disp; 175 if (__libc_sigaction(sig, &sa, &psa) == -1) 176 return (SIG_ERR); 177 if (sigismember(&pset, sig)) 178 return (SIG_HOLD); 179 else 180 return (psa.sa_handler); 181 } 182