sig.c revision 1.9
1 /* $NetBSD: sig.c,v 1.9 2002/03/18 16:00:58 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 "config.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 1.9 2002/03/18 16:00:58 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 "el.h" 54 #include <stdlib.h> 55 56 private EditLine *sel = NULL; 57 58 private const int sighdl[] = { 59 #define _DO(a) (a), 60 ALLSIGS 61 #undef _DO 62 - 1 63 }; 64 65 private void sig_handler(int); 66 67 /* sig_handler(): 68 * This is the handler called for all signals 69 * XXX: we cannot pass any data so we just store the old editline 70 * state in a private variable 71 */ 72 private void 73 sig_handler(int signo) 74 { 75 int i; 76 sigset_t nset, oset; 77 78 (void) sigemptyset(&nset); 79 (void) sigaddset(&nset, signo); 80 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 81 82 switch (signo) { 83 case SIGCONT: 84 tty_rawmode(sel); 85 if (ed_redisplay(sel, 0) == CC_REFRESH) 86 re_refresh(sel); 87 term__flush(); 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) signal(signo, sel->el_signal[i]); 104 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 105 (void) kill(0, signo); 106 } 107 108 109 /* sig_init(): 110 * Initialize all signal stuff 111 */ 112 protected int 113 sig_init(EditLine *el) 114 { 115 int i; 116 sigset_t nset, oset; 117 118 (void) sigemptyset(&nset); 119 #define _DO(a) (void) sigaddset(&nset, a); 120 ALLSIGS 121 #undef _DO 122 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 123 124 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t)) 125 126 el->el_signal = (sig_t *) el_malloc(SIGSIZE); 127 if (el->el_signal == NULL) 128 return (-1); 129 for (i = 0; sighdl[i] != -1; i++) 130 el->el_signal[i] = SIG_ERR; 131 132 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 133 134 return (0); 135 } 136 137 138 /* sig_end(): 139 * Clear all signal stuff 140 */ 141 protected void 142 sig_end(EditLine *el) 143 { 144 145 el_free((ptr_t) el->el_signal); 146 el->el_signal = NULL; 147 } 148 149 150 /* sig_set(): 151 * set all the signal handlers 152 */ 153 protected void 154 sig_set(EditLine *el) 155 { 156 int i; 157 sigset_t nset, oset; 158 159 (void) sigemptyset(&nset); 160 #define _DO(a) (void) sigaddset(&nset, a); 161 ALLSIGS 162 #undef _DO 163 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 164 165 for (i = 0; sighdl[i] != -1; i++) { 166 sig_t s; 167 /* This could happen if we get interrupted */ 168 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 169 el->el_signal[i] = s; 170 } 171 sel = el; 172 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 173 } 174 175 176 /* sig_clr(): 177 * clear all the signal handlers 178 */ 179 protected void 180 sig_clr(EditLine *el) 181 { 182 int i; 183 sigset_t nset, oset; 184 185 (void) sigemptyset(&nset); 186 #define _DO(a) (void) sigaddset(&nset, a); 187 ALLSIGS 188 #undef _DO 189 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 190 191 for (i = 0; sighdl[i] != -1; i++) 192 if (el->el_signal[i] != SIG_ERR) 193 (void) signal(sighdl[i], el->el_signal[i]); 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 Fri Sep 26 20:09:58 GMT 2025