1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* signals.c -- Signal processing source
This file is part of Redshift.
Redshift is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Redshift is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Redshift. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2009-2015 Jon Lund Steffensen <jonlst@gmail.com>
Copyright (c) 2015 Mattias Andrée <m@maandree.se>
*/
#include "common.h"
#if !defined(__WIN32__)
volatile sig_atomic_t exiting = 0;
volatile sig_atomic_t disable = 0;
/* Signal handler for exit signals */
static void
sigexit(int signo)
{
exiting = 1;
}
/* Signal handler for disable signal */
static void
sigdisable(int signo)
{
disable = 1;
}
#else
int disable = 0;
int exiting = 0;
#endif
int
signals_install_handlers(void)
{
#ifndef WINDOWS
struct sigaction sigact;
sigset_t sigset;
/* Install signal handler for INT and TERM signals */
memset(&sigact, 0, sizeof(sigact));
sigemptyset(&sigset);
sigact.sa_handler = sigexit;
sigact.sa_mask = sigset;
sigact.sa_flags = 0;
if (sigaction(SIGINT, &sigact, NULL)) {
perror("sigaction");
return -1;
}
if (sigaction(SIGTERM, &sigact, NULL)) {
perror("sigaction");
return -1;
}
if (sigaction(SIGQUIT, &sigact, NULL)) {
perror("sigaction");
return -1;
}
/* Install signal handler for USR1 signal */
sigact.sa_handler = sigdisable;
sigact.sa_mask = sigset;
sigact.sa_flags = 0;
if (sigaction(SIGUSR1, &sigact, NULL)) {
perror("sigaction");
return -1;
}
/* Ignore CHLD signal. This causes child processes
(hooks) to be reaped automatically. */
sigact.sa_handler = SIG_IGN;
sigact.sa_mask = sigset;
sigact.sa_flags = 0;
if (sigaction(SIGCHLD, &sigact, NULL)) {
perror("sigaction");
return -1;
}
#endif
return 0;
}
|
