sig.c revision 1.13
1 /* $NetBSD: sig.c,v 1.13 2009/02/15 21:25:01 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 1.13 2009/02/15 21:25:01 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 switch (signo) { 79 case SIGCONT: 80 tty_rawmode(sel); 81 if (ed_redisplay(sel, 0) == CC_REFRESH) 82 re_refresh(sel); 83 term__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 } 106 107 108 /* sig_init(): 109 * Initialize all signal stuff 110 */ 111 protected int 112 sig_init(EditLine *el) 113 { 114 size_t i; 115 sigset_t *nset, oset; 116 117 el->el_signal = el_malloc(sizeof(*el->el_signal)); 118 if (el->el_signal == NULL) 119 return -1; 120 121 nset = &el->el_signal->sig_set; 122 (void) sigemptyset(nset); 123 #define _DO(a) (void) sigaddset(nset, a); 124 ALLSIGS 125 #undef _DO 126 (void) sigprocmask(SIG_BLOCK, nset, &oset); 127 128 for (i = 0; sighdl[i] != -1; i++) { 129 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 130 el->el_signal->sig_action[i].sa_flags = 0; 131 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 132 } 133 134 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 135 136 return 0; 137 } 138 139 140 /* sig_end(): 141 * Clear all signal stuff 142 */ 143 protected void 144 sig_end(EditLine *el) 145 { 146 147 el_free((ptr_t) el->el_signal); 148 el->el_signal = NULL; 149 } 150 151 152 /* sig_set(): 153 * set all the signal handlers 154 */ 155 protected void 156 sig_set(EditLine *el) 157 { 158 size_t i; 159 sigset_t oset; 160 struct sigaction osa, nsa; 161 162 nsa.sa_handler = sig_handler; 163 nsa.sa_flags = 0; 164 sigemptyset(&nsa.sa_mask); 165 166 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 167 168 for (i = 0; sighdl[i] != -1; i++) { 169 /* This could happen if we get interrupted */ 170 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 171 osa.sa_handler != sig_handler) 172 el->el_signal->sig_action[i] = osa; 173 } 174 sel = el; 175 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 176 } 177 178 179 /* sig_clr(): 180 * clear all the signal handlers 181 */ 182 protected void 183 sig_clr(EditLine *el) 184 { 185 size_t i; 186 sigset_t oset; 187 188 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 189 190 for (i = 0; sighdl[i] != -1; i++) 191 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 192 (void)sigaction(sighdl[i], 193 &el->el_signal->sig_action[i], NULL); 194 195 sel = NULL; /* we are going to die if the handler is 196 * called */ 197 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 198 } 199
Indexes created Thu Sep 25 16:09:42 GMT 2025