sig.c revision 8870 
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
37#if !defined(lint) && !defined(SCCSID)
38static char sccsid[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
39#endif /* not lint && not SCCSID */
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 int sighdl[] = {
53#define _DO(a)	(a),
54    ALLSIGS
55#undef _DO
56    -1
57};
58
59private void sig_handler	__P((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(signo)
68    int signo;
69{
70    int i;
71    sigset_t nset, oset;
72
73    (void) sigemptyset(&nset);
74    (void) sigaddset(&nset, signo);
75    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
76
77    switch (signo) {
78    case SIGCONT:
79	tty_rawmode(sel);
80	if (ed_redisplay(sel, 0) == CC_REFRESH)
81	    re_refresh(sel);
82	term__flush();
83	break;
84
85    case SIGWINCH:
86	el_resize(sel);
87	break;
88
89    default:
90	tty_cookedmode(sel);
91	break;
92    }
93
94    for (i = 0; sighdl[i] != -1; i++)
95	if (signo == sighdl[i])
96	    break;
97
98    (void) signal(signo, sel->el_signal[i]);
99    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
100    (void) kill(0, signo);
101}
102
103
104/* sig_init():
105 *	Initialize all signal stuff
106 */
107protected int
108sig_init(el)
109    EditLine *el;
110{
111    int i;
112    sigset_t nset, oset;
113
114    (void) sigemptyset(&nset);
115#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
116    ALLSIGS
117#undef _DO
118    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
119
120#define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t))
121
122    el->el_signal = (sig_t *) el_malloc(SIGSIZE);
123    for (i = 0; sighdl[i] != -1; i++)
124	el->el_signal[i] = BADSIG;
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(el)
137    EditLine *el;
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(el)
149    EditLine *el;
150{
151    int i;
152    sigset_t nset, oset;
153
154    (void) sigemptyset(&nset);
155#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
156    ALLSIGS
157#undef _DO
158    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
159
160    for (i = 0; sighdl[i] != -1; i++) {
161	sig_t s;
162	/* This could happen if we get interrupted */
163	if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
164	    el->el_signal[i] = s;
165    }
166    sel = el;
167    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
168}
169
170
171/* sig_clr():
172 *	clear all the signal handlers
173 */
174protected void
175sig_clr(el)
176    EditLine *el;
177{
178    int i;
179    sigset_t nset, oset;
180
181    (void) sigemptyset(&nset);
182#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
183    ALLSIGS
184#undef _DO
185    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
186
187    for (i = 0; sighdl[i] != -1; i++)
188	if (el->el_signal[i] != BADSIG)
189	    (void) signal(sighdl[i], el->el_signal[i]);
190
191    sel = NULL;	/* we are going to die if the handler is called */
192    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
193}
194