jail: Add MS_NODEV MS_NOEXEC MS_NOSUID mount options where needed
[project/procd.git] / signal.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #include <sys/reboot.h>
16 #include <sys/types.h>
17
18 #include <unistd.h>
19
20 #include "procd.h"
21
22 static void do_reboot(void)
23 {
24 LOG("reboot\n");
25 fflush(stderr);
26 sync();
27 sleep(2);
28 reboot(RB_AUTOBOOT);
29 while (1)
30 ;
31 }
32
33 static void signal_shutdown(int signal, siginfo_t *siginfo, void *data)
34 {
35 int event = 0;
36 char *msg = NULL;
37
38 switch(signal) {
39 case SIGINT:
40 case SIGTERM:
41 event = RB_AUTOBOOT;
42 msg = "reboot";
43 break;
44 case SIGUSR1:
45 case SIGUSR2:
46 event = RB_POWER_OFF;
47 msg = "poweroff";
48 break;
49 }
50
51 DEBUG(1, "Triggering %s\n", msg);
52 if (event)
53 procd_shutdown(event);
54 }
55
56 struct sigaction sa_shutdown = {
57 .sa_sigaction = signal_shutdown,
58 .sa_flags = SA_SIGINFO
59 };
60
61 static void signal_crash(int signal, siginfo_t *siginfo, void *data)
62 {
63 ERROR("Rebooting as procd has crashed\n");
64 do_reboot();
65 }
66
67 struct sigaction sa_crash = {
68 .sa_sigaction = signal_crash,
69 .sa_flags = SA_SIGINFO
70 };
71
72 static void signal_dummy(int signal, siginfo_t *siginfo, void *data)
73 {
74 ERROR("Got unexpected signal %d\n", signal);
75 }
76
77 struct sigaction sa_dummy = {
78 .sa_sigaction = signal_dummy,
79 .sa_flags = SA_SIGINFO
80 };
81
82 void procd_signal(void)
83 {
84 signal(SIGPIPE, SIG_IGN);
85 if (getpid() != 1)
86 return;
87 sigaction(SIGTERM, &sa_shutdown, NULL);
88 sigaction(SIGINT, &sa_shutdown, NULL);
89 sigaction(SIGUSR1, &sa_shutdown, NULL);
90 sigaction(SIGUSR2, &sa_shutdown, NULL);
91 sigaction(SIGSEGV, &sa_crash, NULL);
92 sigaction(SIGBUS, &sa_crash, NULL);
93 sigaction(SIGHUP, &sa_dummy, NULL);
94 sigaction(SIGKILL, &sa_dummy, NULL);
95 sigaction(SIGSTOP, &sa_dummy, NULL);
96 reboot(RB_DISABLE_CAD);
97 }