sig.c revision 1.23
1 /* $NetBSD: sig.c,v 1.23 2016/02/16 15:54:15 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 1.23 2016/02/16 15:54:15 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 "el.h" 50 #include <stdlib.h> 51 #include <errno.h> 52 53 private EditLine *sel = NULL; 54 55 private const 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(int signo) 71 { 72 int i, save_errno; 73 sigset_t nset, oset; 74 75 save_errno = errno; 76 (void) sigemptyset(&nset); 77 (void) sigaddset(&nset, signo); 78 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 79 80 sel->el_signal->sig_no = signo; 81 82 switch (signo) { 83 case SIGCONT: 84 tty_rawmode(sel); 85 if (ed_redisplay(sel, 0) == CC_REFRESH) 86 re_refresh(sel); 87 terminal__flush(sel); 88 break; 89 90 case SIGWINCH: 91 el_resize(sel); 92 break; 93 94 default: 95 tty_cookedmode(sel); 96 break; 97 } 98 99 for (i = 0; sighdl[i] != -1; i++) 100 if (signo == sighdl[i]) 101 break; 102 103 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 104 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 105 sel->el_signal->sig_action[i].sa_flags = 0; 106 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 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(EditLine *el) 118 { 119 size_t i; 120 sigset_t *nset, oset; 121 122 el->el_signal = el_malloc(sizeof(*el->el_signal)); 123 if (el->el_signal == NULL) 124 return -1; 125 126 nset = &el->el_signal->sig_set; 127 (void) sigemptyset(nset); 128 #define _DO(a) (void) sigaddset(nset, a); 129 ALLSIGS 130 #undef _DO 131 (void) sigprocmask(SIG_BLOCK, nset, &oset); 132 133 for (i = 0; sighdl[i] != -1; i++) { 134 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 135 el->el_signal->sig_action[i].sa_flags = 0; 136 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 137 } 138 139 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 140 141 return 0; 142 } 143 144 145 /* sig_end(): 146 * Clear all signal stuff 147 */ 148 protected void 149 sig_end(EditLine *el) 150 { 151 152 el_free(el->el_signal); 153 el->el_signal = NULL; 154 } 155 156 157 /* sig_set(): 158 * set all the signal handlers 159 */ 160 protected void 161 sig_set(EditLine *el) 162 { 163 size_t i; 164 sigset_t oset; 165 struct sigaction osa, nsa; 166 167 nsa.sa_handler = sig_handler; 168 nsa.sa_flags = 0; 169 sigemptyset(&nsa.sa_mask); 170 171 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 172 173 for (i = 0; sighdl[i] != -1; i++) { 174 /* This could happen if we get interrupted */ 175 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 176 osa.sa_handler != sig_handler) 177 el->el_signal->sig_action[i] = osa; 178 } 179 sel = el; 180 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 181 } 182 183 184 /* sig_clr(): 185 * clear all the signal handlers 186 */ 187 protected void 188 sig_clr(EditLine *el) 189 { 190 size_t i; 191 sigset_t oset; 192 193 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 194 195 for (i = 0; sighdl[i] != -1; i++) 196 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 197 (void)sigaction(sighdl[i], 198 &el->el_signal->sig_action[i], NULL); 199 200 sel = NULL; /* we are going to die if the handler is 201 * called */ 202 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 203 } 204
Indexes created Tue Sep 30 20:09:53 GMT 2025