sig.c revision 63900 
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 * $FreeBSD: head/lib/libedit/sig.c 63900 2000-07-26 23:46:28Z ache $
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
43/*
44 * sig.c: Signal handling stuff.
45 *	  our policy is to trap all signals, set a good state
46 *	  and pass the ball to our caller.
47 */
48#include "sys.h"
49#include "el.h"
50#include <stdlib.h>
51
52private EditLine *sel = NULL;
53
54private int sighdl[] = {
55#define _DO(a)	(a),
56    ALLSIGS
57#undef _DO
58    -1
59};
60
61private void sig_handler	__P((int));
62
63/* sig_handler():
64 *	This is the handler called for all signals
65 *	XXX: we cannot pass any data so we just store the old editline
66 *	state in a private variable
67 */
68private void
69sig_handler(signo)
70    int signo;
71{
72    int i;
73    sigset_t nset, oset;
74
75    (void) sigemptyset(&nset);
76    (void) sigaddset(&nset, signo);
77    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
78
79    switch (signo) {
80    case SIGCONT:
81	tty_rawmode(sel);
82	if (ed_redisplay(sel, 0) == CC_REFRESH)
83	    re_refresh(sel);
84	term__flush();
85	break;
86
87    case SIGWINCH:
88	el_resize(sel);
89	break;
90
91    default:
92	tty_cookedmode(sel);
93	break;
94    }
95
96    for (i = 0; sighdl[i] != -1; i++)
97	if (signo == sighdl[i])
98	    break;
99
100    (void) signal(signo, sel->el_signal[i]);
101    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
102    (void) kill(0, signo);
103}
104
105
106/* sig_init():
107 *	Initialize all signal stuff
108 */
109protected int
110sig_init(el)
111    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    for (i = 0; sighdl[i] != -1; i++)
126	el->el_signal[i] = SIG_ERR;
127
128    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
129
130    return 0;
131}
132
133
134/* sig_end():
135 *	Clear all signal stuff
136 */
137protected void
138sig_end(el)
139    EditLine *el;
140{
141    el_free((ptr_t) el->el_signal);
142    el->el_signal = NULL;
143}
144
145
146/* sig_set():
147 *	set all the signal handlers
148 */
149protected void
150sig_set(el)
151    EditLine *el;
152{
153    int i;
154    sigset_t nset, oset;
155
156    (void) sigemptyset(&nset);
157#define _DO(a) (void) sigaddset(&nset, a);
158    ALLSIGS
159#undef _DO
160    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
161
162    for (i = 0; sighdl[i] != -1; i++) {
163	sig_t s;
164	/* This could happen if we get interrupted */
165	if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
166	    el->el_signal[i] = s;
167    }
168    sel = el;
169    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
170}
171
172
173/* sig_clr():
174 *	clear all the signal handlers
175 */
176protected void
177sig_clr(el)
178    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 called */
194    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
195}
196