sig.c revision 84260 
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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	$NetBSD: sig.c,v 1.7 2001/01/04 15:55:03 christos Exp $
37 */
38
39#if !defined(lint) && !defined(SCCSID)
40static char sccsid[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
41#endif /* not lint && not SCCSID */
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/lib/libedit/sig.c 84260 2001-10-01 08:41:27Z obrien $");
44
45/*
46 * sig.c: Signal handling stuff.
47 *	  our policy is to trap all signals, set a good state
48 *	  and pass the ball to our caller.
49 */
50#include "sys.h"
51#include "el.h"
52#include <stdlib.h>
53
54private EditLine *sel = NULL;
55
56private const int sighdl[] = {
57#define	_DO(a)	(a),
58	ALLSIGS
59#undef	_DO
60	- 1
61};
62
63private void sig_handler(int);
64
65/* sig_handler():
66 *	This is the handler called for all signals
67 *	XXX: we cannot pass any data so we just store the old editline
68 *	state in a private variable
69 */
70private void
71sig_handler(int signo)
72{
73	int i;
74	sigset_t nset, oset;
75
76	(void) sigemptyset(&nset);
77	(void) sigaddset(&nset, signo);
78	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
79
80	switch (signo) {
81	case SIGCONT:
82		tty_rawmode(sel);
83		if (ed_redisplay(sel, 0) == CC_REFRESH)
84			re_refresh(sel);
85		term__flush();
86		break;
87
88	case SIGWINCH:
89		el_resize(sel);
90		break;
91
92	default:
93		tty_cookedmode(sel);
94		break;
95	}
96
97	for (i = 0; sighdl[i] != -1; i++)
98		if (signo == sighdl[i])
99			break;
100
101	(void) signal(signo, sel->el_signal[i]);
102	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
103	(void) kill(0, signo);
104}
105
106
107/* sig_init():
108 *	Initialize all signal stuff
109 */
110protected int
111sig_init(EditLine *el)
112{
113	int i;
114	sigset_t nset, oset;
115
116	(void) sigemptyset(&nset);
117#define	_DO(a) (void) sigaddset(&nset, a);
118	ALLSIGS
119#undef	_DO
120	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
121
122#define	SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t))
123
124	el->el_signal = (sig_t *) el_malloc(SIGSIZE);
125	if (el->el_signal == NULL)
126		return (-1);
127	for (i = 0; sighdl[i] != -1; i++)
128		el->el_signal[i] = SIG_ERR;
129
130	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
131
132	return (0);
133}
134
135
136/* sig_end():
137 *	Clear all signal stuff
138 */
139protected void
140sig_end(EditLine *el)
141{
142
143	el_free((ptr_t) el->el_signal);
144	el->el_signal = NULL;
145}
146
147
148/* sig_set():
149 *	set all the signal handlers
150 */
151protected void
152sig_set(EditLine *el)
153{
154	int i;
155	sigset_t nset, oset;
156
157	(void) sigemptyset(&nset);
158#define	_DO(a) (void) sigaddset(&nset, a);
159	ALLSIGS
160#undef	_DO
161	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
162
163	for (i = 0; sighdl[i] != -1; i++) {
164		sig_t s;
165		/* This could happen if we get interrupted */
166		if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
167			el->el_signal[i] = s;
168	}
169	sel = el;
170	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
171}
172
173
174/* sig_clr():
175 *	clear all the signal handlers
176 */
177protected void
178sig_clr(EditLine *el)
179{
180	int i;
181	sigset_t nset, oset;
182
183	(void) sigemptyset(&nset);
184#define	_DO(a) (void) sigaddset(&nset, a);
185	ALLSIGS
186#undef	_DO
187	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
188
189	for (i = 0; sighdl[i] != -1; i++)
190		if (el->el_signal[i] != SIG_ERR)
191			(void) signal(sighdl[i], el->el_signal[i]);
192
193	sel = NULL;		/* we are going to die if the handler is
194				 * called */
195	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
196}
197