1 /* $OpenBSD: sig.c,v 1.9 2003/06/02 20:18:40 millert Exp $ */ 2 /* $NetBSD: sig.c,v 1.3 1997/04/11 17:52:48 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Christos Zoulas of Cornell University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if !defined(lint) && !defined(SCCSID) 37 #if 0 38 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static const char rcsid[] = "$OpenBSD: sig.c,v 1.9 2003/06/02 20:18:40 millert 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 "sys.h" 50 #include "el.h" 51 #include <stdlib.h> 52 53 private EditLine *sel = NULL; 54 55 private int sighdl[] = { 56 #define _DO(a) (a), 57 ALLSIGS 58 #undef _DO 59 -1 60 }; 61 62 private void sig_handler(int); 63 64 /* sig_handler(): 65 * This is the handler called for all signals 66 * XXX: we cannot pass any data so we just store the old editline 67 * state in a private variable 68 */ 69 private void 70 sig_handler(signo) 71 int signo; 72 { 73 int save_errno = errno; 74 int i; 75 sigset_t nset, oset; 76 77 (void)sigemptyset(&nset); 78 (void)sigaddset(&nset, signo); 79 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 80 81 switch (signo) { 82 case SIGCONT: 83 tty_rawmode(sel); /* XXX signal race */ 84 if (ed_redisplay(sel, 0) == CC_REFRESH) /* XXX signal race */ 85 re_refresh(sel); /* XXX signal race */ 86 term__flush(); /* XXX signal race */ 87 break; 88 89 case SIGWINCH: 90 el_resize(sel); /* XXX signal race */ 91 break; 92 93 default: 94 tty_cookedmode(sel); /* XXX signal race */ 95 break; 96 } 97 98 for (i = 0; sighdl[i] != -1; i++) 99 if (signo == sighdl[i]) 100 break; 101 102 (void)signal(signo, sel->el_signal[i]); 103 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 104 (void)kill(0, signo); 105 errno = save_errno; 106 } 107 108 109 /* sig_init(): 110 * Initialize all signal stuff 111 */ 112 protected int 113 sig_init(el) 114 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 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(el) 142 EditLine *el; 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(el) 154 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(el) 181 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 called */ 197 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 198 } 199