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 $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 /* 47 * sig.c: Signal handling stuff. 48 * our policy is to trap all signals, set a good state 49 * and pass the ball to our caller. 50 */ 51 #include "el.h" 52 #include <stdlib.h> 53 54 private EditLine *sel = NULL; 55 56 private const int sighdl[] = { 57 #define _DO(a) (a), 58 ALLSIGS 59 #undef _DO 60 - 1 61 }; 62 63 private void sig_handler(int); 64 65 /* sig_handler(): 66 * This is the handler called for all signals 67 * XXX: we cannot pass any data so we just store the old editline 68 * state in a private variable 69 */ 70 private void 71 sig_handler(int signo) 72 { 73 int i; 74 sigset_t nset, oset; 75 76 (void) sigemptyset(&nset); 77 (void) sigaddset(&nset, signo); 78 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 79 80 sel->el_signal->sig_no = signo; 81 82 switch (signo) { 83 case SIGCONT: 84 tty_rawmode(sel); 85 if (ed_redisplay(sel, 0) == CC_REFRESH) 86 re_refresh(sel); 87 terminal__flush(sel); 88 break; 89 90 case SIGWINCH: 91 el_resize(sel); 92 break; 93 94 default: 95 tty_cookedmode(sel); 96 break; 97 } 98 99 for (i = 0; sighdl[i] != -1; i++) 100 if (signo == sighdl[i]) 101 break; 102 103 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 104 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 105 sel->el_signal->sig_action[i].sa_flags = 0; 106 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 107 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 108 (void) kill(0, signo); 109 } 110 111 112 /* sig_init(): 113 * Initialize all signal stuff 114 */ 115 protected int 116 sig_init(EditLine *el) 117 { 118 size_t i; 119 sigset_t *nset, oset; 120 121 el->el_signal = el_malloc(sizeof(*el->el_signal)); 122 if (el->el_signal == NULL) 123 return -1; 124 125 nset = &el->el_signal->sig_set; 126 (void) sigemptyset(nset); 127 #define _DO(a) (void) sigaddset(nset, a); 128 ALLSIGS 129 #undef _DO 130 (void) sigprocmask(SIG_BLOCK, nset, &oset); 131 132 for (i = 0; sighdl[i] != -1; i++) { 133 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 134 el->el_signal->sig_action[i].sa_flags = 0; 135 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 136 } 137 138 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 139 140 return 0; 141 } 142 143 144 /* sig_end(): 145 * Clear all signal stuff 146 */ 147 protected void 148 sig_end(EditLine *el) 149 { 150 151 el_free(el->el_signal); 152 el->el_signal = NULL; 153 } 154 155 156 /* sig_set(): 157 * set all the signal handlers 158 */ 159 protected void 160 sig_set(EditLine *el) 161 { 162 size_t i; 163 sigset_t oset; 164 struct sigaction osa, nsa; 165 166 nsa.sa_handler = sig_handler; 167 nsa.sa_flags = 0; 168 sigemptyset(&nsa.sa_mask); 169 170 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 171 172 for (i = 0; sighdl[i] != -1; i++) { 173 /* This could happen if we get interrupted */ 174 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 175 osa.sa_handler != sig_handler) 176 el->el_signal->sig_action[i] = osa; 177 } 178 sel = el; 179 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 180 } 181 182 183 /* sig_clr(): 184 * clear all the signal handlers 185 */ 186 protected void 187 sig_clr(EditLine *el) 188 { 189 size_t i; 190 sigset_t oset; 191 192 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 193 194 for (i = 0; sighdl[i] != -1; i++) 195 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 196 (void)sigaction(sighdl[i], 197 &el->el_signal->sig_action[i], NULL); 198 199 sel = NULL; /* we are going to die if the handler is 200 * called */ 201 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 202 } 203