1 /* $OpenBSD: sig.c,v 1.11 2009/10/27 23:59:28 deraadt Exp $ */ 2 /* $NetBSD: sig.c,v 1.11 2003/08/07 16:44:33 agc 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 "el.h" 44 #include <stdlib.h> 45 46 private EditLine *sel = NULL; 47 48 private const int sighdl[] = { 49 #define _DO(a) (a), 50 ALLSIGS 51 #undef _DO 52 - 1 53 }; 54 55 private void sig_handler(int); 56 57 /* sig_handler(): 58 * This is the handler called for all signals 59 * XXX: we cannot pass any data so we just store the old editline 60 * state in a private variable 61 */ 62 private void 63 sig_handler(int signo) 64 { 65 int i; 66 sigset_t nset, oset; 67 68 (void) sigemptyset(&nset); 69 (void) sigaddset(&nset, signo); 70 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 71 72 switch (signo) { 73 case SIGCONT: 74 tty_rawmode(sel); 75 if (ed_redisplay(sel, 0) == CC_REFRESH) 76 re_refresh(sel); 77 term__flush(); 78 break; 79 80 case SIGWINCH: 81 el_resize(sel); 82 break; 83 84 default: 85 tty_cookedmode(sel); 86 break; 87 } 88 89 for (i = 0; sighdl[i] != -1; i++) 90 if (signo == sighdl[i]) 91 break; 92 93 (void) signal(signo, sel->el_signal[i]); 94 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 95 (void) kill(0, signo); 96 } 97 98 99 /* sig_init(): 100 * Initialize all signal stuff 101 */ 102 protected int 103 sig_init(EditLine *el) 104 { 105 int i; 106 sigset_t nset, oset; 107 108 (void) sigemptyset(&nset); 109 #define _DO(a) (void) sigaddset(&nset, a); 110 ALLSIGS 111 #undef _DO 112 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 113 114 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(el_signalhandler_t)) 115 116 el->el_signal = (el_signalhandler_t *) el_malloc(SIGSIZE); 117 if (el->el_signal == NULL) 118 return (-1); 119 for (i = 0; sighdl[i] != -1; i++) 120 el->el_signal[i] = SIG_ERR; 121 122 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 123 124 return (0); 125 } 126 127 128 /* sig_end(): 129 * Clear all signal stuff 130 */ 131 protected void 132 sig_end(EditLine *el) 133 { 134 135 el_free((ptr_t) el->el_signal); 136 el->el_signal = NULL; 137 } 138 139 140 /* sig_set(): 141 * set all the signal handlers 142 */ 143 protected void 144 sig_set(EditLine *el) 145 { 146 int i; 147 sigset_t nset, oset; 148 149 (void) sigemptyset(&nset); 150 #define _DO(a) (void) sigaddset(&nset, a); 151 ALLSIGS 152 #undef _DO 153 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 154 155 for (i = 0; sighdl[i] != -1; i++) { 156 el_signalhandler_t s; 157 /* This could happen if we get interrupted */ 158 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 159 el->el_signal[i] = s; 160 } 161 sel = el; 162 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 163 } 164 165 166 /* sig_clr(): 167 * clear all the signal handlers 168 */ 169 protected void 170 sig_clr(EditLine *el) 171 { 172 int i; 173 sigset_t nset, oset; 174 175 (void) sigemptyset(&nset); 176 #define _DO(a) (void) sigaddset(&nset, a); 177 ALLSIGS 178 #undef _DO 179 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 180 181 for (i = 0; sighdl[i] != -1; i++) 182 if (el->el_signal[i] != SIG_ERR) 183 (void) signal(sighdl[i], el->el_signal[i]); 184 185 sel = NULL; /* we are going to die if the handler is 186 * called */ 187 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 188 } 189