sig.c revision 148834 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas of Cornell University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	$NetBSD: sig.c,v 1.11 2003/08/07 16:44:33 agc Exp $
33 */
34
35#if !defined(lint) && !defined(SCCSID)
36static char sccsid[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
37#endif /* not lint && not SCCSID */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/lib/libedit/sig.c 148834 2005-08-07 20:55:59Z stefanf $");
40
41/*
42 * sig.c: Signal handling stuff.
43 *	  our policy is to trap all signals, set a good state
44 *	  and pass the ball to our caller.
45 */
46#include "sys.h"
47#include "el.h"
48#include <stdlib.h>
49
50private EditLine *sel = NULL;
51
52private const int sighdl[] = {
53#define	_DO(a)	(a),
54	ALLSIGS
55#undef	_DO
56	- 1
57};
58
59private void sig_handler(int);
60
61/* sig_handler():
62 *	This is the handler called for all signals
63 *	XXX: we cannot pass any data so we just store the old editline
64 *	state in a private variable
65 */
66private void
67sig_handler(int signo)
68{
69	int i;
70	sigset_t nset, oset;
71
72	(void) sigemptyset(&nset);
73	(void) sigaddset(&nset, signo);
74	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
75
76	switch (signo) {
77	case SIGCONT:
78		tty_rawmode(sel);
79		if (ed_redisplay(sel, 0) == CC_REFRESH)
80			re_refresh(sel);
81		term__flush();
82		break;
83
84	case SIGWINCH:
85		el_resize(sel);
86		break;
87
88	default:
89		tty_cookedmode(sel);
90		break;
91	}
92
93	for (i = 0; sighdl[i] != -1; i++)
94		if (signo == sighdl[i])
95			break;
96
97	(void) signal(signo, sel->el_signal[i]);
98	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
99	(void) kill(0, signo);
100}
101
102
103/* sig_init():
104 *	Initialize all signal stuff
105 */
106protected int
107sig_init(EditLine *el)
108{
109	int i;
110	sigset_t nset, oset;
111
112	(void) sigemptyset(&nset);
113#define	_DO(a) (void) sigaddset(&nset, a);
114	ALLSIGS
115#undef	_DO
116	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
117
118#define	SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(el_signalhandler_t))
119
120	el->el_signal = (el_signalhandler_t *) el_malloc(SIGSIZE);
121	if (el->el_signal == NULL)
122		return (-1);
123	for (i = 0; sighdl[i] != -1; i++)
124		el->el_signal[i] = SIG_ERR;
125
126	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
127
128	return (0);
129}
130
131
132/* sig_end():
133 *	Clear all signal stuff
134 */
135protected void
136sig_end(EditLine *el)
137{
138
139	el_free((ptr_t) el->el_signal);
140	el->el_signal = NULL;
141}
142
143
144/* sig_set():
145 *	set all the signal handlers
146 */
147protected void
148sig_set(EditLine *el)
149{
150	int i;
151	sigset_t nset, oset;
152
153	(void) sigemptyset(&nset);
154#define	_DO(a) (void) sigaddset(&nset, a);
155	ALLSIGS
156#undef	_DO
157	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
158
159	for (i = 0; sighdl[i] != -1; i++) {
160		el_signalhandler_t s;
161		/* This could happen if we get interrupted */
162		if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
163			el->el_signal[i] = s;
164	}
165	sel = el;
166	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
167}
168
169
170/* sig_clr():
171 *	clear all the signal handlers
172 */
173protected void
174sig_clr(EditLine *el)
175{
176	int i;
177	sigset_t nset, oset;
178
179	(void) sigemptyset(&nset);
180#define	_DO(a) (void) sigaddset(&nset, a);
181	ALLSIGS
182#undef	_DO
183	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
184
185	for (i = 0; sighdl[i] != -1; i++)
186		if (el->el_signal[i] != SIG_ERR)
187			(void) signal(sighdl[i], el->el_signal[i]);
188
189	sel = NULL;		/* we are going to die if the handler is
190				 * called */
191	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
192}
193