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
104
105
106
107
|
/*
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program 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.
*/
#include <sys/reboot.h>
#include <sys/types.h>
#include <unistd.h>
#include "procd.h"
static int preinit;
static void do_reboot(void)
{
LOG("reboot\n");
fflush(stderr);
sync();
sleep(2);
reboot(RB_AUTOBOOT);
while (1)
;
}
static void signal_shutdown(int signal, siginfo_t *siginfo, void *data)
{
int event = 0;
char *msg = NULL;
if (preinit)
do_reboot();
switch(signal) {
case SIGTERM:
event = RB_AUTOBOOT;
msg = "reboot";
break;
case SIGUSR1:
case SIGUSR2:
event = RB_POWER_OFF;
msg = "poweroff";
break;
}
DEBUG(1, "Triggering %s\n", msg);
if (event)
procd_shutdown(event);
}
struct sigaction sa_shutdown = {
.sa_sigaction = signal_shutdown,
.sa_flags = SA_SIGINFO
};
static void signal_crash(int signal, siginfo_t *siginfo, void *data)
{
ERROR("Rebooting as procd has crashed\n");
do_reboot();
}
struct sigaction sa_crash = {
.sa_sigaction = signal_crash,
.sa_flags = SA_SIGINFO
};
static void signal_dummy(int signal, siginfo_t *siginfo, void *data)
{
ERROR("Got unexpected signal %d\n", signal);
}
struct sigaction sa_dummy = {
.sa_sigaction = signal_dummy,
.sa_flags = SA_SIGINFO
};
void procd_signal(void)
{
signal(SIGPIPE, SIG_IGN);
if (getpid() != 1)
return;
sigaction(SIGTERM, &sa_shutdown, NULL);
sigaction(SIGUSR1, &sa_shutdown, NULL);
sigaction(SIGUSR2, &sa_shutdown, NULL);
sigaction(SIGSEGV, &sa_crash, NULL);
sigaction(SIGBUS, &sa_crash, NULL);
sigaction(SIGHUP, &sa_dummy, NULL);
sigaction(SIGKILL, &sa_dummy, NULL);
sigaction(SIGSTOP, &sa_dummy, NULL);
}
void procd_signal_preinit(void)
{
preinit = 1;
sigaction(SIGTERM, &sa_shutdown, NULL);
sigaction(SIGUSR1, &sa_shutdown, NULL);
sigaction(SIGUSR2, &sa_shutdown, NULL);
}
|
