1 /* $NetBSD: sig.c,v 1.6 2000/09/04 22:06:32 lukem 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 1.6 2000/09/04 22:06:32 lukem 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, SIGWINCH); 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 for (i = 0; sighdl[i] != -1; i++) 129 el->el_signal[i] = SIG_ERR; 130 131 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 132 133 return (0); 134 } 135 136 137 /* sig_end(): 138 * Clear all signal stuff 139 */ 140 protected void 141 sig_end(EditLine *el) 142 { 143 144 el_free((ptr_t) el->el_signal); 145 el->el_signal = NULL; 146 } 147 148 149 /* sig_set(): 150 * set all the signal handlers 151 */ 152 protected void 153 sig_set(EditLine *el) 154 { 155 int i; 156 sigset_t nset, oset; 157 158 (void) sigemptyset(&nset); 159 #define _DO(a) (void) sigaddset(&nset, SIGWINCH); 160 ALLSIGS 161 #undef _DO 162 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 163 164 for (i = 0; sighdl[i] != -1; i++) { 165 sig_t s; 166 /* This could happen if we get interrupted */ 167 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 168 el->el_signal[i] = s; 169 } 170 sel = el; 171 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 172 } 173 174 175 /* sig_clr(): 176 * clear all the signal handlers 177 */ 178 protected void 179 sig_clr(EditLine *el) 180 { 181 int i; 182 sigset_t nset, oset; 183 184 (void) sigemptyset(&nset); 185 #define _DO(a) (void) sigaddset(&nset, SIGWINCH); 186 ALLSIGS 187 #undef _DO 188 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 189 190 for (i = 0; sighdl[i] != -1; i++) 191 if (el->el_signal[i] != SIG_ERR) 192 (void) signal(sighdl[i], el->el_signal[i]); 193 194 sel = NULL; /* we are going to die if the handler is 195 * called */ 196 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 197 } 198