1 /* $NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "config.h"
36 #if !defined(lint) && !defined(SCCSID)
37 #if 0
38 static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: sig.c,v 1.24 2016/02/16 19:08:41 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 /*
47 * sig.c: Signal handling stuff.
48 * our policy is to trap all signals, set a good state
49 * and pass the ball to our caller.
50 */
51 #include <errno.h>
52 #include <stdlib.h>
53
54 #include "el.h"
55 #include "common.h"
56
57 private EditLine *sel = NULL;
58
59 private const int sighdl[] = {
60 #define _DO(a) (a),
61 ALLSIGS
62 #undef _DO
63 - 1
64 };
65
66 private void sig_handler(int);
67
68 /* sig_handler():
69 * This is the handler called for all signals
70 * XXX: we cannot pass any data so we just store the old editline
71 * state in a private variable
72 */
73 private void
sig_handler(int signo)74 sig_handler(int signo)
75 {
76 int i, save_errno;
77 sigset_t nset, oset;
78
79 save_errno = errno;
80 (void) sigemptyset(&nset);
81 (void) sigaddset(&nset, signo);
82 (void) sigprocmask(SIG_BLOCK, &nset, &oset);
83
84 sel->el_signal->sig_no = signo;
85
86 switch (signo) {
87 case SIGCONT:
88 tty_rawmode(sel);
89 if (ed_redisplay(sel, 0) == CC_REFRESH)
90 re_refresh(sel);
91 terminal__flush(sel);
92 break;
93
94 case SIGWINCH:
95 el_resize(sel);
96 break;
97
98 default:
99 tty_cookedmode(sel);
100 break;
101 }
102
103 for (i = 0; sighdl[i] != -1; i++)
104 if (signo == sighdl[i])
105 break;
106
107 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL);
108 sel->el_signal->sig_action[i].sa_handler = SIG_ERR;
109 sel->el_signal->sig_action[i].sa_flags = 0;
110 sigemptyset(&sel->el_signal->sig_action[i].sa_mask);
111 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
112 (void) kill(0, signo);
113 errno = save_errno;
114 }
115
116
117 /* sig_init():
118 * Initialize all signal stuff
119 */
120 protected int
sig_init(EditLine * el)121 sig_init(EditLine *el)
122 {
123 size_t i;
124 sigset_t *nset, oset;
125
126 el->el_signal = el_malloc(sizeof(*el->el_signal));
127 if (el->el_signal == NULL)
128 return -1;
129
130 nset = &el->el_signal->sig_set;
131 (void) sigemptyset(nset);
132 #define _DO(a) (void) sigaddset(nset, a);
133 ALLSIGS
134 #undef _DO
135 (void) sigprocmask(SIG_BLOCK, nset, &oset);
136
137 for (i = 0; sighdl[i] != -1; i++) {
138 el->el_signal->sig_action[i].sa_handler = SIG_ERR;
139 el->el_signal->sig_action[i].sa_flags = 0;
140 sigemptyset(&el->el_signal->sig_action[i].sa_mask);
141 }
142
143 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
144
145 return 0;
146 }
147
148
149 /* sig_end():
150 * Clear all signal stuff
151 */
152 protected void
sig_end(EditLine * el)153 sig_end(EditLine *el)
154 {
155
156 el_free(el->el_signal);
157 el->el_signal = NULL;
158 }
159
160
161 /* sig_set():
162 * set all the signal handlers
163 */
164 protected void
sig_set(EditLine * el)165 sig_set(EditLine *el)
166 {
167 size_t i;
168 sigset_t oset;
169 struct sigaction osa, nsa;
170
171 nsa.sa_handler = sig_handler;
172 nsa.sa_flags = 0;
173 sigemptyset(&nsa.sa_mask);
174
175 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
176
177 for (i = 0; sighdl[i] != -1; i++) {
178 /* This could happen if we get interrupted */
179 if (sigaction(sighdl[i], &nsa, &osa) != -1 &&
180 osa.sa_handler != sig_handler)
181 el->el_signal->sig_action[i] = osa;
182 }
183 sel = el;
184 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
185 }
186
187
188 /* sig_clr():
189 * clear all the signal handlers
190 */
191 protected void
sig_clr(EditLine * el)192 sig_clr(EditLine *el)
193 {
194 size_t i;
195 sigset_t oset;
196
197 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
198
199 for (i = 0; sighdl[i] != -1; i++)
200 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR)
201 (void)sigaction(sighdl[i],
202 &el->el_signal->sig_action[i], NULL);
203
204 sel = NULL; /* we are going to die if the handler is
205 * called */
206 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
207 }
208