1 /* $NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
36 #if !defined(lint) && !defined(SCCSID)
38 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93";
40 __RCSID("$NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 christos Exp $");
42 #endif /* not lint && not SCCSID */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
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.
57 private EditLine *sel = NULL;
59 private const int sighdl[] = {
66 private void sig_handler(int);
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
74 sig_handler(int signo)
80 (void) sigemptyset(&nset);
81 (void) sigaddset(&nset, signo);
82 (void) sigprocmask(SIG_BLOCK, &nset, &oset);
84 sel->el_signal->sig_no = signo;
89 if (ed_redisplay(sel, 0) == CC_REFRESH)
103 for (i = 0; sighdl[i] != -1; i++)
104 if (signo == sighdl[i])
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);
118 * Initialize all signal stuff
121 sig_init(EditLine *el)
124 sigset_t *nset, oset;
126 el->el_signal = el_malloc(sizeof(*el->el_signal));
127 if (el->el_signal == NULL)
130 nset = &el->el_signal->sig_set;
131 (void) sigemptyset(nset);
132 #define _DO(a) (void) sigaddset(nset, a);
135 (void) sigprocmask(SIG_BLOCK, nset, &oset);
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);
143 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
150 * Clear all signal stuff
153 sig_end(EditLine *el)
156 el_free(el->el_signal);
157 el->el_signal = NULL;
162 * set all the signal handlers
165 sig_set(EditLine *el)
169 struct sigaction osa, nsa;
171 nsa.sa_handler = sig_handler;
173 sigemptyset(&nsa.sa_mask);
175 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
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;
184 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
189 * clear all the signal handlers
192 sig_clr(EditLine *el)
197 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
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);
204 sel = NULL; /* we are going to die if the handler is
206 (void)sigprocmask(SIG_SETMASK, &oset, NULL);