1 /* $OpenBSD: sig.c,v 1.19 2016/04/11 21:17:29 schwarze Exp $ */ 2 /* $NetBSD: sig.c,v 1.25 2016/04/11 18:56:31 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Christos Zoulas of Cornell University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "config.h" 37 38 /* 39 * sig.c: Signal handling stuff. 40 * our policy is to trap all signals, set a good state 41 * and pass the ball to our caller. 42 */ 43 #include <errno.h> 44 #include <stdlib.h> 45 46 #include "el.h" 47 #include "common.h" 48 49 static EditLine *sel = NULL; 50 51 static const int sighdl[] = { 52 #define _DO(a) (a), 53 ALLSIGS 54 #undef _DO 55 - 1 56 }; 57 58 static void sig_handler(int); 59 60 /* sig_handler(): 61 * This is the handler called for all signals 62 * XXX: we cannot pass any data so we just store the old editline 63 * state in a private variable 64 */ 65 static void 66 sig_handler(int signo) 67 { 68 int i, save_errno; 69 sigset_t nset, oset; 70 71 save_errno = errno; 72 (void) sigemptyset(&nset); 73 (void) sigaddset(&nset, signo); 74 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 75 76 sel->el_signal->sig_no = signo; 77 78 switch (signo) { 79 case SIGCONT: 80 tty_rawmode(sel); 81 if (ed_redisplay(sel, 0) == CC_REFRESH) 82 re_refresh(sel); 83 terminal__flush(sel); 84 break; 85 86 case SIGWINCH: 87 el_resize(sel); 88 break; 89 90 default: 91 tty_cookedmode(sel); 92 break; 93 } 94 95 for (i = 0; sighdl[i] != -1; i++) 96 if (signo == sighdl[i]) 97 break; 98 99 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 100 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 101 sel->el_signal->sig_action[i].sa_flags = 0; 102 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 103 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 104 (void) kill(0, signo); 105 errno = save_errno; 106 } 107 108 109 /* sig_init(): 110 * Initialize all signal stuff 111 */ 112 protected int 113 sig_init(EditLine *el) 114 { 115 size_t i; 116 sigset_t *nset, oset; 117 118 el->el_signal = malloc(sizeof(*el->el_signal)); 119 if (el->el_signal == NULL) 120 return -1; 121 122 nset = &el->el_signal->sig_set; 123 (void) sigemptyset(nset); 124 #define _DO(a) (void) sigaddset(nset, a); 125 ALLSIGS 126 #undef _DO 127 (void) sigprocmask(SIG_BLOCK, nset, &oset); 128 129 for (i = 0; sighdl[i] != -1; i++) { 130 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 131 el->el_signal->sig_action[i].sa_flags = 0; 132 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 133 } 134 135 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 136 137 return 0; 138 } 139 140 141 /* sig_end(): 142 * Clear all signal stuff 143 */ 144 protected void 145 sig_end(EditLine *el) 146 { 147 148 free(el->el_signal); 149 el->el_signal = NULL; 150 } 151 152 153 /* sig_set(): 154 * set all the signal handlers 155 */ 156 protected void 157 sig_set(EditLine *el) 158 { 159 size_t i; 160 sigset_t oset; 161 struct sigaction osa, nsa; 162 163 nsa.sa_handler = sig_handler; 164 nsa.sa_flags = 0; 165 sigemptyset(&nsa.sa_mask); 166 167 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 168 169 for (i = 0; sighdl[i] != -1; i++) { 170 /* This could happen if we get interrupted */ 171 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 172 osa.sa_handler != sig_handler) 173 el->el_signal->sig_action[i] = osa; 174 } 175 sel = el; 176 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 177 } 178 179 180 /* sig_clr(): 181 * clear all the signal handlers 182 */ 183 protected void 184 sig_clr(EditLine *el) 185 { 186 size_t i; 187 sigset_t oset; 188 189 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 190 191 for (i = 0; sighdl[i] != -1; i++) 192 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 193 (void)sigaction(sighdl[i], 194 &el->el_signal->sig_action[i], NULL); 195 196 sel = NULL; /* we are going to die if the handler is 197 * called */ 198 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 199 } 200