sig.c revision 1.7
1 /* $NetBSD: sig.c,v 1.7 2001/01/04 15:55:03 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if !defined(lint) && !defined(SCCSID) 41 #if 0 42 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: sig.c,v 1.7 2001/01/04 15:55:03 christos Exp $"); 45 #endif 46 #endif /* not lint && not SCCSID */ 47 48 /* 49 * sig.c: Signal handling stuff. 50 * our policy is to trap all signals, set a good state 51 * and pass the ball to our caller. 52 */ 53 #include "sys.h" 54 #include "el.h" 55 #include <stdlib.h> 56 57 private EditLine *sel = NULL; 58 59 private int sighdl[] = { 60 #define _DO(a) (a), 61 ALLSIGS 62 #undef _DO 63 - 1 64 }; 65 66 private void sig_handler(int); 67 68 /* sig_handler(): 69 * This is the handler called for all signals 70 * XXX: we cannot pass any data so we just store the old editline 71 * state in a private variable 72 */ 73 private void 74 sig_handler(int signo) 75 { 76 int i; 77 sigset_t nset, oset; 78 79 (void) sigemptyset(&nset); 80 (void) sigaddset(&nset, signo); 81 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 82 83 switch (signo) { 84 case SIGCONT: 85 tty_rawmode(sel); 86 if (ed_redisplay(sel, 0) == CC_REFRESH) 87 re_refresh(sel); 88 term__flush(); 89 break; 90 91 case SIGWINCH: 92 el_resize(sel); 93 break; 94 95 default: 96 tty_cookedmode(sel); 97 break; 98 } 99 100 for (i = 0; sighdl[i] != -1; i++) 101 if (signo == sighdl[i]) 102 break; 103 104 (void) signal(signo, sel->el_signal[i]); 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 int i; 117 sigset_t nset, oset; 118 119 (void) sigemptyset(&nset); 120 #define _DO(a) (void) sigaddset(&nset, a); 121 ALLSIGS 122 #undef _DO 123 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 124 125 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t)) 126 127 el->el_signal = (sig_t *) el_malloc(SIGSIZE); 128 if (el->el_signal == NULL) 129 return (-1); 130 for (i = 0; sighdl[i] != -1; i++) 131 el->el_signal[i] = SIG_ERR; 132 133 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 134 135 return (0); 136 } 137 138 139 /* sig_end(): 140 * Clear all signal stuff 141 */ 142 protected void 143 sig_end(EditLine *el) 144 { 145 146 el_free((ptr_t) el->el_signal); 147 el->el_signal = NULL; 148 } 149 150 151 /* sig_set(): 152 * set all the signal handlers 153 */ 154 protected void 155 sig_set(EditLine *el) 156 { 157 int i; 158 sigset_t nset, oset; 159 160 (void) sigemptyset(&nset); 161 #define _DO(a) (void) sigaddset(&nset, a); 162 ALLSIGS 163 #undef _DO 164 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 165 166 for (i = 0; sighdl[i] != -1; i++) { 167 sig_t s; 168 /* This could happen if we get interrupted */ 169 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 170 el->el_signal[i] = s; 171 } 172 sel = el; 173 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 174 } 175 176 177 /* sig_clr(): 178 * clear all the signal handlers 179 */ 180 protected void 181 sig_clr(EditLine *el) 182 { 183 int i; 184 sigset_t nset, oset; 185 186 (void) sigemptyset(&nset); 187 #define _DO(a) (void) sigaddset(&nset, a); 188 ALLSIGS 189 #undef _DO 190 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 191 192 for (i = 0; sighdl[i] != -1; i++) 193 if (el->el_signal[i] != SIG_ERR) 194 (void) signal(sighdl[i], el->el_signal[i]); 195 196 sel = NULL; /* we are going to die if the handler is 197 * called */ 198 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 199 } 200
Indexes created Mon Sep 29 03:10:08 GMT 2025