1 /*
2 * tc.sig.c: Signal routine emulations
3 */
4 /*-
5 * Copyright (c) 1980, 1991 The Regents of the University of California.
6 * All rights reserved.
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 #include "sh.h"
33 #include "tc.wait.h"
34
35 void
sigset_interrupting(int sig,void (* fn)(int))36 sigset_interrupting(int sig, void (*fn) (int))
37 {
38 struct sigaction act;
39
40 act.sa_handler = fn;
41 sigemptyset(&act.sa_mask);
42 act.sa_flags = 0;
43 if (sigaction(sig, &act, NULL) == 0) {
44 sigset_t set;
45 sigemptyset(&set);
46 sigaddset(&set, sig);
47 sigprocmask(SIG_UNBLOCK, &set, NULL);
48 }
49 }
50
51 static volatile sig_atomic_t alrmcatch_pending; /* = 0; */
52 static volatile sig_atomic_t pchild_pending; /* = 0; */
53 static volatile sig_atomic_t phup_pending; /* = 0; */
54 static volatile sig_atomic_t pintr_pending; /* = 0; */
55 int alrmcatch_disabled; /* = 0; */
56 int phup_disabled; /* = 0; */
57 int pchild_disabled; /* = 0; */
58 int pintr_disabled; /* = 0; */
59
60 int
handle_pending_signals(void)61 handle_pending_signals(void)
62 {
63 int rv = 0;
64 if (!phup_disabled && phup_pending) {
65 phup_pending = 0;
66 handle_interrupt++;
67 phup();
68 handle_interrupt--;
69 }
70 if (!pintr_disabled && pintr_pending) {
71 pintr_pending = 0;
72 handle_interrupt++;
73 pintr();
74 handle_interrupt--;
75 rv = 1;
76 }
77 if (!pchild_disabled && pchild_pending) {
78 pchild_pending = 0;
79 handle_interrupt++;
80 pchild();
81 handle_interrupt--;
82 }
83 if (!alrmcatch_disabled && alrmcatch_pending) {
84 alrmcatch_pending = 0;
85 handle_interrupt++;
86 alrmcatch();
87 handle_interrupt--;
88 }
89 return rv;
90 }
91
92 void
queue_alrmcatch(int sig)93 queue_alrmcatch(int sig)
94 {
95 USE(sig);
96 alrmcatch_pending = 1;
97 }
98
99 void
queue_pchild(int sig)100 queue_pchild(int sig)
101 {
102 USE(sig);
103 pchild_pending = 1;
104 }
105
106 void
queue_phup(int sig)107 queue_phup(int sig)
108 {
109 USE(sig);
110 phup_pending = 1;
111 }
112
113 void
queue_pintr(int sig)114 queue_pintr(int sig)
115 {
116 USE(sig);
117 pintr_pending = 1;
118 }
119
120 void
disabled_cleanup(void * xdisabled)121 disabled_cleanup(void *xdisabled)
122 {
123 int *disabled;
124
125 disabled = xdisabled;
126 if (--*disabled == 0)
127 handle_pending_signals();
128 }
129
130 void
pintr_disabled_restore(void * xold)131 pintr_disabled_restore(void *xold)
132 {
133 int *old;
134
135 old = xold;
136 pintr_disabled = *old;
137 }
138
139 void
pintr_push_enable(int * saved)140 pintr_push_enable(int *saved)
141 {
142 *saved = pintr_disabled;
143 pintr_disabled = 0;
144 cleanup_push(saved, pintr_disabled_restore);
145 handle_pending_signals();
146 }
147