sig.c revision 1.12
1 /* $NetBSD: sig.c,v 1.12 2008/09/10 15:45:37 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 1.12 2008/09/10 15:45:37 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) signal(signo, sel->el_signal[i]); 100 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 101 (void) kill(0, signo); 102 } 103 104 105 /* sig_init(): 106 * Initialize all signal stuff 107 */ 108 protected int 109 sig_init(EditLine *el) 110 { 111 int i; 112 sigset_t nset, oset; 113 114 (void) sigemptyset(&nset); 115 #define _DO(a) (void) sigaddset(&nset, a); 116 ALLSIGS 117 #undef _DO 118 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 119 120 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(el_signalhandler_t)) 121 122 el->el_signal = (el_signalhandler_t *) el_malloc(SIGSIZE); 123 if (el->el_signal == NULL) 124 return (-1); 125 for (i = 0; sighdl[i] != -1; i++) 126 el->el_signal[i] = SIG_ERR; 127 128 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 129 130 return (0); 131 } 132 133 134 /* sig_end(): 135 * Clear all signal stuff 136 */ 137 protected void 138 sig_end(EditLine *el) 139 { 140 141 el_free((ptr_t) el->el_signal); 142 el->el_signal = NULL; 143 } 144 145 146 /* sig_set(): 147 * set all the signal handlers 148 */ 149 protected void 150 sig_set(EditLine *el) 151 { 152 int i; 153 sigset_t nset, oset; 154 155 (void) sigemptyset(&nset); 156 #define _DO(a) (void) sigaddset(&nset, a); 157 ALLSIGS 158 #undef _DO 159 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 160 161 for (i = 0; sighdl[i] != -1; i++) { 162 el_signalhandler_t s; 163 /* This could happen if we get interrupted */ 164 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 165 el->el_signal[i] = s; 166 } 167 sel = el; 168 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 169 } 170 171 172 /* sig_clr(): 173 * clear all the signal handlers 174 */ 175 protected void 176 sig_clr(EditLine *el) 177 { 178 int i; 179 sigset_t nset, oset; 180 181 (void) sigemptyset(&nset); 182 #define _DO(a) (void) sigaddset(&nset, a); 183 ALLSIGS 184 #undef _DO 185 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 186 187 for (i = 0; sighdl[i] != -1; i++) 188 if (el->el_signal[i] != SIG_ERR) 189 (void) signal(sighdl[i], el->el_signal[i]); 190 191 sel = NULL; /* we are going to die if the handler is 192 * called */ 193 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 194 } 195
Indexes created Thu Sep 25 16:09:42 GMT 2025