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 1.15 2009/02/19 15:20:22 christos Exp $
33 */
34
35 #if !defined(lint) && !defined(SCCSID)
36 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93";
37 #endif /* not lint && not SCCSID */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/10/lib/libedit/sig.c 238378 2012-07-11 22:20:19Z pfg $");
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
50 private EditLine *sel = NULL;
51
52 private const int sighdl[] = {
53 #define _DO(a) (a),
54 ALLSIGS
55 #undef _DO
56 - 1
57 };
58
59 private 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 */
66 private void
sig_handler(int signo)67 sig_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 sel->el_signal->sig_no = signo;
77
78 switch (signo) {
79 case SIGCONT:
80 tty_rawmode(sel);
81 if (ed_redisplay(sel, 0) == CC_REFRESH)
82 re_refresh(sel);
83 term__flush(sel);
84 break;
85
86 case SIGWINCH:
87 el_resize(sel);
88 break;
89
90 default:
91 tty_cookedmode(sel);
92 break;
93 }
94
95 for (i = 0; sighdl[i] != -1; i++)
96 if (signo == sighdl[i])
97 break;
98
99 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL);
100 sel->el_signal->sig_action[i].sa_handler = SIG_ERR;
101 sel->el_signal->sig_action[i].sa_flags = 0;
102 sigemptyset(&sel->el_signal->sig_action[i].sa_mask);
103 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
104 (void) kill(0, signo);
105 }
106
107
108 /* sig_init():
109 * Initialize all signal stuff
110 */
111 protected int
sig_init(EditLine * el)112 sig_init(EditLine *el)
113 {
114 size_t i;
115 sigset_t *nset, oset;
116
117 el->el_signal = el_malloc(sizeof(*el->el_signal));
118 if (el->el_signal == NULL)
119 return -1;
120
121 nset = &el->el_signal->sig_set;
122 (void) sigemptyset(nset);
123 #define _DO(a) (void) sigaddset(nset, a);
124 ALLSIGS
125 #undef _DO
126 (void) sigprocmask(SIG_BLOCK, nset, &oset);
127
128 for (i = 0; sighdl[i] != -1; i++) {
129 el->el_signal->sig_action[i].sa_handler = SIG_ERR;
130 el->el_signal->sig_action[i].sa_flags = 0;
131 sigemptyset(&el->el_signal->sig_action[i].sa_mask);
132 }
133
134 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
135
136 return 0;
137 }
138
139
140 /* sig_end():
141 * Clear all signal stuff
142 */
143 protected void
sig_end(EditLine * el)144 sig_end(EditLine *el)
145 {
146
147 el_free((ptr_t) el->el_signal);
148 el->el_signal = NULL;
149 }
150
151
152 /* sig_set():
153 * set all the signal handlers
154 */
155 protected void
sig_set(EditLine * el)156 sig_set(EditLine *el)
157 {
158 size_t i;
159 sigset_t oset;
160 struct sigaction osa, nsa;
161
162 nsa.sa_handler = sig_handler;
163 nsa.sa_flags = 0;
164 sigemptyset(&nsa.sa_mask);
165
166 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
167
168 for (i = 0; sighdl[i] != -1; i++) {
169 /* This could happen if we get interrupted */
170 if (sigaction(sighdl[i], &nsa, &osa) != -1 &&
171 osa.sa_handler != sig_handler)
172 el->el_signal->sig_action[i] = osa;
173 }
174 sel = el;
175 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
176 }
177
178
179 /* sig_clr():
180 * clear all the signal handlers
181 */
182 protected void
sig_clr(EditLine * el)183 sig_clr(EditLine *el)
184 {
185 size_t i;
186 sigset_t oset;
187
188 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
189
190 for (i = 0; sighdl[i] != -1; i++)
191 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR)
192 (void)sigaction(sighdl[i],
193 &el->el_signal->sig_action[i], NULL);
194
195 sel = NULL; /* we are going to die if the handler is
196 * called */
197 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
198 }
199