1 /* $NetBSD: sig.c,v 1.4 1997/07/06 18:25:35 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 1.4 1997/07/06 18:25:35 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 __P((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(signo) 75 int signo; 76 { 77 int i; 78 sigset_t nset, oset; 79 80 (void) sigemptyset(&nset); 81 (void) sigaddset(&nset, signo); 82 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 83 84 switch (signo) { 85 case SIGCONT: 86 tty_rawmode(sel); 87 if (ed_redisplay(sel, 0) == CC_REFRESH) 88 re_refresh(sel); 89 term__flush(); 90 break; 91 92 case SIGWINCH: 93 el_resize(sel); 94 break; 95 96 default: 97 tty_cookedmode(sel); 98 break; 99 } 100 101 for (i = 0; sighdl[i] != -1; i++) 102 if (signo == sighdl[i]) 103 break; 104 105 (void) signal(signo, sel->el_signal[i]); 106 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 107 (void) kill(0, signo); 108 } 109 110 111 /* sig_init(): 112 * Initialize all signal stuff 113 */ 114 protected int 115 sig_init(el) 116 EditLine *el; 117 { 118 int i; 119 sigset_t nset, oset; 120 121 (void) sigemptyset(&nset); 122 #define _DO(a) (void) sigaddset(&nset, SIGWINCH); 123 ALLSIGS 124 #undef _DO 125 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 126 127 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t)) 128 129 el->el_signal = (sig_t *) el_malloc(SIGSIZE); 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(el) 144 EditLine *el; 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(el) 156 EditLine *el; 157 { 158 int i; 159 sigset_t nset, oset; 160 161 (void) sigemptyset(&nset); 162 #define _DO(a) (void) sigaddset(&nset, SIGWINCH); 163 ALLSIGS 164 #undef _DO 165 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 166 167 for (i = 0; sighdl[i] != -1; i++) { 168 sig_t s; 169 /* This could happen if we get interrupted */ 170 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 171 el->el_signal[i] = s; 172 } 173 sel = el; 174 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 175 } 176 177 178 /* sig_clr(): 179 * clear all the signal handlers 180 */ 181 protected void 182 sig_clr(el) 183 EditLine *el; 184 { 185 int i; 186 sigset_t nset, oset; 187 188 (void) sigemptyset(&nset); 189 #define _DO(a) (void) sigaddset(&nset, SIGWINCH); 190 ALLSIGS 191 #undef _DO 192 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 193 194 for (i = 0; sighdl[i] != -1; i++) 195 if (el->el_signal[i] != SIG_ERR) 196 (void) signal(sighdl[i], el->el_signal[i]); 197 198 sel = NULL; /* we are going to die if the handler is called */ 199 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 200 } 201