1/* $NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 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 38static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 39#else 40__RCSID("$NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 christos Exp $"); 41#endif 42#endif /* not lint && not SCCSID */ 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: stable/11/lib/libedit/sig.c 313981 2017-02-20 03:33:59Z pfg $"); 45 46/* 47 * sig.c: Signal handling stuff. 48 * our policy is to trap all signals, set a good state 49 * and pass the ball to our caller. 50 */ 51#include <errno.h> 52#include <stdlib.h> 53 54#include "el.h" 55#include "common.h" 56 57private EditLine *sel = NULL; 58 59private const int sighdl[] = { 60#define _DO(a) (a), 61 ALLSIGS 62#undef _DO 63 - 1 64}; 65 66private void sig_handler(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 */ 73private void 74sig_handler(int signo) 75{ 76 int i, save_errno; 77 sigset_t nset, oset; 78 79 save_errno = errno; 80 (void) sigemptyset(&nset); 81 (void) sigaddset(&nset, signo); 82 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 83 84 sel->el_signal->sig_no = signo; 85 86 switch (signo) { 87 case SIGCONT: 88 tty_rawmode(sel); 89 if (ed_redisplay(sel, 0) == CC_REFRESH) 90 re_refresh(sel); 91 terminal__flush(sel); 92 break; 93 94 case SIGWINCH: 95 el_resize(sel); 96 break; 97 98 default: 99 tty_cookedmode(sel); 100 break; 101 } 102 103 for (i = 0; sighdl[i] != -1; i++) 104 if (signo == sighdl[i]) 105 break; 106 107 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 108 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 109 sel->el_signal->sig_action[i].sa_flags = 0; 110 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 111 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 112 (void) kill(0, signo); 113 errno = save_errno; 114} 115 116 117/* sig_init(): 118 * Initialize all signal stuff 119 */ 120protected int 121sig_init(EditLine *el) 122{ 123 size_t i; 124 sigset_t *nset, oset; 125 126 el->el_signal = el_malloc(sizeof(*el->el_signal)); 127 if (el->el_signal == NULL) 128 return -1; 129 130 nset = &el->el_signal->sig_set; 131 (void) sigemptyset(nset); 132#define _DO(a) (void) sigaddset(nset, a); 133 ALLSIGS 134#undef _DO 135 (void) sigprocmask(SIG_BLOCK, nset, &oset); 136 137 for (i = 0; sighdl[i] != -1; i++) { 138 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 139 el->el_signal->sig_action[i].sa_flags = 0; 140 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 141 } 142 143 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 144 145 return 0; 146} 147 148 149/* sig_end(): 150 * Clear all signal stuff 151 */ 152protected void 153sig_end(EditLine *el) 154{ 155 156 el_free(el->el_signal); 157 el->el_signal = NULL; 158} 159 160 161/* sig_set(): 162 * set all the signal handlers 163 */ 164protected void 165sig_set(EditLine *el) 166{ 167 size_t i; 168 sigset_t oset; 169 struct sigaction osa, nsa; 170 171 nsa.sa_handler = sig_handler; 172 nsa.sa_flags = 0; 173 sigemptyset(&nsa.sa_mask); 174 175 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 176 177 for (i = 0; sighdl[i] != -1; i++) { 178 /* This could happen if we get interrupted */ 179 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 180 osa.sa_handler != sig_handler) 181 el->el_signal->sig_action[i] = osa; 182 } 183 sel = el; 184 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 185} 186 187 188/* sig_clr(): 189 * clear all the signal handlers 190 */ 191protected void 192sig_clr(EditLine *el) 193{ 194 size_t i; 195 sigset_t oset; 196 197 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 198 199 for (i = 0; sighdl[i] != -1; i++) 200 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 201 (void)sigaction(sighdl[i], 202 &el->el_signal->sig_action[i], NULL); 203 204 sel = NULL; /* we are going to die if the handler is 205 * called */ 206 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 207} 208