1 /* $NetBSD: sig.c,v 1.17 2011/07/28 20:50:55 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Christos Zoulas of Cornell University. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include "config.h" 36 #if !defined(lint) && !defined(SCCSID) 37 #if 0 38 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: sig.c,v 1.17 2011/07/28 20:50:55 christos Exp $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 44 /* 45 * sig.c: Signal handling stuff. 46 * our policy is to trap all signals, set a good state 47 * and pass the ball to our caller. 48 */ 49 #include "el.h" 50 #include <stdlib.h> 51 52 private EditLine *sel = NULL; 53 54 private const int sighdl[] = { 55 #define _DO(a) (a), 56 ALLSIGS 57 #undef _DO 58 - 1 59 }; 60 61 private void sig_handler(int); 62 63 /* sig_handler(): 64 * This is the handler called for all signals 65 * XXX: we cannot pass any data so we just store the old editline 66 * state in a private variable 67 */ 68 private void 69 sig_handler(int signo) 70 { 71 int i; 72 sigset_t nset, oset; 73 74 (void) sigemptyset(&nset); 75 (void) sigaddset(&nset, signo); 76 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 77 78 sel->el_signal->sig_no = signo; 79 80 switch (signo) { 81 case SIGCONT: 82 tty_rawmode(sel); 83 if (ed_redisplay(sel, 0) == CC_REFRESH) 84 re_refresh(sel); 85 terminal__flush(sel); 86 break; 87 88 case SIGWINCH: 89 el_resize(sel); 90 break; 91 92 default: 93 tty_cookedmode(sel); 94 break; 95 } 96 97 for (i = 0; sighdl[i] != -1; i++) 98 if (signo == sighdl[i]) 99 break; 100 101 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 102 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 103 sel->el_signal->sig_action[i].sa_flags = 0; 104 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 105 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 106 (void) kill(0, signo); 107 } 108 109 110 /* sig_init(): 111 * Initialize all signal stuff 112 */ 113 protected int 114 sig_init(EditLine *el) 115 { 116 size_t i; 117 sigset_t *nset, oset; 118 119 el->el_signal = el_malloc(sizeof(*el->el_signal)); 120 if (el->el_signal == NULL) 121 return -1; 122 123 nset = &el->el_signal->sig_set; 124 (void) sigemptyset(nset); 125 #define _DO(a) (void) sigaddset(nset, a); 126 ALLSIGS 127 #undef _DO 128 (void) sigprocmask(SIG_BLOCK, nset, &oset); 129 130 for (i = 0; sighdl[i] != -1; i++) { 131 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 132 el->el_signal->sig_action[i].sa_flags = 0; 133 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 134 } 135 136 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 137 138 return 0; 139 } 140 141 142 /* sig_end(): 143 * Clear all signal stuff 144 */ 145 protected void 146 sig_end(EditLine *el) 147 { 148 149 el_free(el->el_signal); 150 el->el_signal = NULL; 151 } 152 153 154 /* sig_set(): 155 * set all the signal handlers 156 */ 157 protected void 158 sig_set(EditLine *el) 159 { 160 size_t i; 161 sigset_t oset; 162 struct sigaction osa, nsa; 163 164 nsa.sa_handler = sig_handler; 165 nsa.sa_flags = 0; 166 sigemptyset(&nsa.sa_mask); 167 168 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 169 170 for (i = 0; sighdl[i] != -1; i++) { 171 /* This could happen if we get interrupted */ 172 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 173 osa.sa_handler != sig_handler) 174 el->el_signal->sig_action[i] = osa; 175 } 176 sel = el; 177 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 178 } 179 180 181 /* sig_clr(): 182 * clear all the signal handlers 183 */ 184 protected void 185 sig_clr(EditLine *el) 186 { 187 size_t i; 188 sigset_t oset; 189 190 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 191 192 for (i = 0; sighdl[i] != -1; i++) 193 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 194 (void)sigaction(sighdl[i], 195 &el->el_signal->sig_action[i], NULL); 196 197 sel = NULL; /* we are going to die if the handler is 198 * called */ 199 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 200 } 201