sig.c revision 1.21
1 /* $NetBSD: sig.c,v 1.21 2016/02/16 14:08:25 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include "config.h" 36 #if !defined(lint) && !defined(SCCSID) 37 #if 0 38 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: sig.c,v 1.21 2016/02/16 14:08:25 christos 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 <errno.h> 50 #include <stdlib.h> 51 52 #include "histedit.h" 53 #include "chartype.h" 54 #include "el.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, save_errno; 76 sigset_t nset, oset; 77 78 save_errno = errno; 79 (void) sigemptyset(&nset); 80 (void) sigaddset(&nset, signo); 81 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 82 83 sel->el_signal->sig_no = signo; 84 85 switch (signo) { 86 case SIGCONT: 87 tty_rawmode(sel); 88 if (ed_redisplay(sel, 0) == CC_REFRESH) 89 re_refresh(sel); 90 terminal__flush(sel); 91 break; 92 93 case SIGWINCH: 94 el_resize(sel); 95 break; 96 97 default: 98 tty_cookedmode(sel); 99 break; 100 } 101 102 for (i = 0; sighdl[i] != -1; i++) 103 if (signo == sighdl[i]) 104 break; 105 106 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 107 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 108 sel->el_signal->sig_action[i].sa_flags = 0; 109 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 110 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 111 (void) kill(0, signo); 112 errno = save_errno; 113 } 114 115 116 /* sig_init(): 117 * Initialize all signal stuff 118 */ 119 protected int 120 sig_init(EditLine *el) 121 { 122 size_t i; 123 sigset_t *nset, oset; 124 125 el->el_signal = el_malloc(sizeof(*el->el_signal)); 126 if (el->el_signal == NULL) 127 return -1; 128 129 nset = &el->el_signal->sig_set; 130 (void) sigemptyset(nset); 131 #define _DO(a) (void) sigaddset(nset, a); 132 ALLSIGS 133 #undef _DO 134 (void) sigprocmask(SIG_BLOCK, nset, &oset); 135 136 for (i = 0; sighdl[i] != -1; i++) { 137 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 138 el->el_signal->sig_action[i].sa_flags = 0; 139 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 140 } 141 142 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 143 144 return 0; 145 } 146 147 148 /* sig_end(): 149 * Clear all signal stuff 150 */ 151 protected void 152 sig_end(EditLine *el) 153 { 154 155 el_free(el->el_signal); 156 el->el_signal = NULL; 157 } 158 159 160 /* sig_set(): 161 * set all the signal handlers 162 */ 163 protected void 164 sig_set(EditLine *el) 165 { 166 size_t i; 167 sigset_t oset; 168 struct sigaction osa, nsa; 169 170 nsa.sa_handler = sig_handler; 171 nsa.sa_flags = 0; 172 sigemptyset(&nsa.sa_mask); 173 174 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 175 176 for (i = 0; sighdl[i] != -1; i++) { 177 /* This could happen if we get interrupted */ 178 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 179 osa.sa_handler != sig_handler) 180 el->el_signal->sig_action[i] = osa; 181 } 182 sel = el; 183 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 184 } 185 186 187 /* sig_clr(): 188 * clear all the signal handlers 189 */ 190 protected void 191 sig_clr(EditLine *el) 192 { 193 size_t i; 194 sigset_t oset; 195 196 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 197 198 for (i = 0; sighdl[i] != -1; i++) 199 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 200 (void)sigaction(sighdl[i], 201 &el->el_signal->sig_action[i], NULL); 202 203 sel = NULL; /* we are going to die if the handler is 204 * called */ 205 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 206 } 207
Indexes created Tue Sep 30 20:09:53 GMT 2025