1 /* $OpenBSD: sig.c,v 1.6 2001/12/06 04:26:00 deraadt 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #if !defined(lint) && !defined(SCCSID) 41 #if 0 42 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 static char rcsid[] = "$OpenBSD: sig.c,v 1.6 2001/12/06 04:26:00 deraadt 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 save_errno = errno; 78 int i; 79 sigset_t nset, oset; 80 81 (void)sigemptyset(&nset); 82 (void)sigaddset(&nset, signo); 83 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 84 85 switch (signo) { 86 case SIGCONT: 87 tty_rawmode(sel); /* XXX signal race */ 88 if (ed_redisplay(sel, 0) == CC_REFRESH) /* XXX signal race */ 89 re_refresh(sel); /* XXX signal race */ 90 term__flush(); /* XXX signal race */ 91 break; 92 93 case SIGWINCH: 94 el_resize(sel); /* XXX signal race */ 95 break; 96 97 default: 98 tty_cookedmode(sel); /* XXX signal race */ 99 break; 100 } 101 102 for (i = 0; sighdl[i] != -1; i++) 103 if (signo == sighdl[i]) 104 break; 105 106 (void)signal(signo, sel->el_signal[i]); 107 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 108 (void)kill(0, signo); 109 errno = save_errno; 110 } 111 112 113 /* sig_init(): 114 * Initialize all signal stuff 115 */ 116 protected int 117 sig_init(el) 118 EditLine *el; 119 { 120 int i; 121 sigset_t nset, oset; 122 123 (void)sigemptyset(&nset); 124 #define _DO(a) (void)sigaddset(&nset, a); 125 ALLSIGS 126 #undef _DO 127 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 128 129 #define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t)) 130 131 el->el_signal = (sig_t *) el_malloc(SIGSIZE); 132 for (i = 0; sighdl[i] != -1; i++) 133 el->el_signal[i] = SIG_ERR; 134 135 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 136 137 return 0; 138 } 139 140 141 /* sig_end(): 142 * Clear all signal stuff 143 */ 144 protected void 145 sig_end(el) 146 EditLine *el; 147 { 148 el_free((ptr_t) el->el_signal); 149 el->el_signal = NULL; 150 } 151 152 153 /* sig_set(): 154 * set all the signal handlers 155 */ 156 protected void 157 sig_set(el) 158 EditLine *el; 159 { 160 int i; 161 sigset_t nset, oset; 162 163 (void)sigemptyset(&nset); 164 #define _DO(a) (void)sigaddset(&nset, a); 165 ALLSIGS 166 #undef _DO 167 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 168 169 for (i = 0; sighdl[i] != -1; i++) { 170 sig_t s; 171 /* This could happen if we get interrupted */ 172 if ((s = signal(sighdl[i], sig_handler)) != sig_handler) 173 el->el_signal[i] = s; 174 } 175 sel = el; 176 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 177 } 178 179 180 /* sig_clr(): 181 * clear all the signal handlers 182 */ 183 protected void 184 sig_clr(el) 185 EditLine *el; 186 { 187 int i; 188 sigset_t nset, oset; 189 190 (void)sigemptyset(&nset); 191 #define _DO(a) (void)sigaddset(&nset, a); 192 ALLSIGS 193 #undef _DO 194 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 195 196 for (i = 0; sighdl[i] != -1; i++) 197 if (el->el_signal[i] != SIG_ERR) 198 (void)signal(sighdl[i], el->el_signal[i]); 199 200 sel = NULL; /* we are going to die if the handler is called */ 201 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 202 } 203