1 /* $NetBSD: sig.c,v 1.28 2024/12/18 15:38:52 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 1.28 2024/12/18 15:38:52 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43
44 /*
45 * sig.c: Signal handling stuff.
46 * our policy is to trap all signals, set a good state
47 * and pass the ball to our caller.
48 */
49 #include <errno.h>
50 #include <stdlib.h>
51
52 #include "el.h"
53 #include "common.h"
54
55 static EditLine *sel = NULL;
56
57 static const int sighdl[] = {
58 #define _DO(a) (a),
59 ALLSIGS
60 #undef _DO
61 - 1
62 };
63
64 static void sig_handler(int);
65
66 /* sig_handler():
67 * This is the handler called for all signals
68 * XXX: we cannot pass any data so we just store the old editline
69 * state in a private variable
70 */
71 static void
sig_handler(int signo)72 sig_handler(int signo)
73 {
74 int i, save_errno;
75 sigset_t nset, oset;
76
77 save_errno = errno;
78 (void) sigemptyset(&nset);
79 (void) sigaddset(&nset, signo);
80 (void) sigprocmask(SIG_BLOCK, &nset, &oset);
81
82 sel->el_signal->sig_no = signo;
83
84 switch (signo) {
85 case SIGCONT:
86 tty_rawmode(sel);
87 if (ed_redisplay(sel, 0) == CC_REFRESH)
88 re_refresh(sel);
89 terminal__flush(sel);
90 break;
91
92 case SIGWINCH:
93 el_resize(sel);
94 break;
95
96 default:
97 tty_cookedmode(sel);
98 break;
99 }
100
101 for (i = 0; sighdl[i] != -1; i++)
102 if (signo == sighdl[i])
103 break;
104
105 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL);
106 sel->el_signal->sig_action[i].sa_handler = SIG_ERR;
107 sel->el_signal->sig_action[i].sa_flags = 0;
108 sigemptyset(&sel->el_signal->sig_action[i].sa_mask);
109 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
110 (void) kill(0, signo);
111 errno = save_errno;
112 }
113
114
115 /* sig_init():
116 * Initialize all signal stuff
117 */
118 libedit_private int
sig_init(EditLine * el)119 sig_init(EditLine *el)
120 {
121 size_t i;
122 sigset_t *nset, oset;
123
124 el->el_signal = el_malloc(sizeof(*el->el_signal));
125 if (el->el_signal == NULL)
126 return -1;
127
128 nset = &el->el_signal->sig_set;
129 (void) sigemptyset(nset);
130 #define _DO(a) (void) sigaddset(nset, a);
131 ALLSIGS
132 #undef _DO
133 (void) sigprocmask(SIG_BLOCK, nset, &oset);
134
135 for (i = 0; sighdl[i] != -1; i++) {
136 el->el_signal->sig_action[i].sa_handler = SIG_ERR;
137 el->el_signal->sig_action[i].sa_flags = 0;
138 sigemptyset(&el->el_signal->sig_action[i].sa_mask);
139 }
140
141 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
142
143 return 0;
144 }
145
146
147 /* sig_end():
148 * Clear all signal stuff
149 */
150 libedit_private void
sig_end(EditLine * el)151 sig_end(EditLine *el)
152 {
153
154 el_free(el->el_signal);
155 el->el_signal = NULL;
156 }
157
158
159 /* sig_set():
160 * set all the signal handlers
161 */
162 libedit_private void
sig_set(EditLine * el)163 sig_set(EditLine *el)
164 {
165 size_t i;
166 sigset_t oset;
167 struct sigaction osa, nsa;
168
169 nsa.sa_handler = sig_handler;
170 nsa.sa_flags = SA_ONSTACK;
171 sigemptyset(&nsa.sa_mask);
172
173 sel = el;
174 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
175
176 for (i = 0; sighdl[i] != -1; i++) {
177 /* This could happen if we get interrupted */
178 if (sigaction(sighdl[i], &nsa, &osa) != -1 &&
179 osa.sa_handler != sig_handler)
180 el->el_signal->sig_action[i] = osa;
181 }
182 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
183 }
184
185
186 /* sig_clr():
187 * clear all the signal handlers
188 */
189 libedit_private void
sig_clr(EditLine * el)190 sig_clr(EditLine *el)
191 {
192 size_t i;
193 sigset_t oset;
194
195 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
196
197 for (i = 0; sighdl[i] != -1; i++)
198 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR)
199 (void)sigaction(sighdl[i],
200 &el->el_signal->sig_action[i], NULL);
201
202 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
203 }
204