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
35void
36sigset_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
51static volatile sig_atomic_t alrmcatch_pending; /* = 0; */
52static volatile sig_atomic_t pchild_pending; /* = 0; */
53static volatile sig_atomic_t phup_pending; /* = 0; */
54static volatile sig_atomic_t pintr_pending; /* = 0; */
55int alrmcatch_disabled; /* = 0; */
56int phup_disabled; /* = 0; */
57int pchild_disabled; /* = 0; */
58int pintr_disabled; /* = 0; */
59
60int
61handle_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
92void
93queue_alrmcatch(int sig)
94{
95    USE(sig);
96    alrmcatch_pending = 1;
97}
98
99void
100queue_pchild(int sig)
101{
102    USE(sig);
103    pchild_pending = 1;
104}
105
106void
107queue_phup(int sig)
108{
109    USE(sig);
110    phup_pending = 1;
111}
112
113void
114queue_pintr(int sig)
115{
116    USE(sig);
117    pintr_pending = 1;
118}
119
120void
121disabled_cleanup(void *xdisabled)
122{
123    int *disabled;
124
125    disabled = xdisabled;
126    if (--*disabled == 0)
127	handle_pending_signals();
128}
129
130void
131pintr_disabled_restore(void *xold)
132{
133    int *old;
134
135    old = xold;
136    pintr_disabled = *old;
137}
138
139void
140pintr_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