1 /* $NetBSD: sig.c,v 1.26 2016/05/09 21:46:56 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 1.26 2016/05/09 21:46:56 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 "el.h" 53 #include "common.h" 54 55 static EditLine *sel = NULL; 56 57 static const int sighdl[] = { 58 #define _DO(a) (a), 59 ALLSIGS 60 #undef _DO 61 - 1 62 }; 63 64 static void sig_handler(int); 65 66 /* sig_handler(): 67 * This is the handler called for all signals 68 * XXX: we cannot pass any data so we just store the old editline 69 * state in a private variable 70 */ 71 static void 72 sig_handler(int signo) 73 { 74 int i, save_errno; 75 sigset_t nset, oset; 76 77 save_errno = errno; 78 (void) sigemptyset(&nset); 79 (void) sigaddset(&nset, signo); 80 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 81 82 sel->el_signal->sig_no = signo; 83 84 switch (signo) { 85 case SIGCONT: 86 tty_rawmode(sel); 87 if (ed_redisplay(sel, 0) == CC_REFRESH) 88 re_refresh(sel); 89 terminal__flush(sel); 90 break; 91 92 case SIGWINCH: 93 el_resize(sel); 94 break; 95 96 default: 97 tty_cookedmode(sel); 98 break; 99 } 100 101 for (i = 0; sighdl[i] != -1; i++) 102 if (signo == sighdl[i]) 103 break; 104 105 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 106 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 107 sel->el_signal->sig_action[i].sa_flags = 0; 108 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 109 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 110 (void) kill(0, signo); 111 errno = save_errno; 112 } 113 114 115 /* sig_init(): 116 * Initialize all signal stuff 117 */ 118 libedit_private int 119 sig_init(EditLine *el) 120 { 121 size_t i; 122 sigset_t *nset, oset; 123 124 el->el_signal = el_malloc(sizeof(*el->el_signal)); 125 if (el->el_signal == NULL) 126 return -1; 127 128 nset = &el->el_signal->sig_set; 129 (void) sigemptyset(nset); 130 #define _DO(a) (void) sigaddset(nset, a); 131 ALLSIGS 132 #undef _DO 133 (void) sigprocmask(SIG_BLOCK, nset, &oset); 134 135 for (i = 0; sighdl[i] != -1; i++) { 136 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 137 el->el_signal->sig_action[i].sa_flags = 0; 138 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 139 } 140 141 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 142 143 return 0; 144 } 145 146 147 /* sig_end(): 148 * Clear all signal stuff 149 */ 150 libedit_private void 151 sig_end(EditLine *el) 152 { 153 154 el_free(el->el_signal); 155 el->el_signal = NULL; 156 } 157 158 159 /* sig_set(): 160 * set all the signal handlers 161 */ 162 libedit_private void 163 sig_set(EditLine *el) 164 { 165 size_t i; 166 sigset_t oset; 167 struct sigaction osa, nsa; 168 169 nsa.sa_handler = sig_handler; 170 nsa.sa_flags = 0; 171 sigemptyset(&nsa.sa_mask); 172 173 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 174 175 for (i = 0; sighdl[i] != -1; i++) { 176 /* This could happen if we get interrupted */ 177 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 178 osa.sa_handler != sig_handler) 179 el->el_signal->sig_action[i] = osa; 180 } 181 sel = el; 182 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 183 } 184 185 186 /* sig_clr(): 187 * clear all the signal handlers 188 */ 189 libedit_private void 190 sig_clr(EditLine *el) 191 { 192 size_t i; 193 sigset_t oset; 194 195 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 196 197 for (i = 0; sighdl[i] != -1; i++) 198 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 199 (void)sigaction(sighdl[i], 200 &el->el_signal->sig_action[i], NULL); 201 202 sel = NULL; /* we are going to die if the handler is 203 * called */ 204 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 205 } 206