procd: Remove redundant errno variable in several printf functions.
[project/procd.git] / state.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 <fcntl.h>
16 #include <sys/reboot.h>
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <unistd.h>
20 #include <sys/types.h>
21 #include <signal.h>
22
23 #include "procd.h"
24 #include "syslog.h"
25 #include "plug/hotplug.h"
26 #include "watchdog.h"
27 #include "service/service.h"
28 #include "utils/utils.h"
29
30 enum {
31 STATE_NONE = 0,
32 STATE_EARLY,
33 STATE_UBUS,
34 STATE_INIT,
35 STATE_RUNNING,
36 STATE_SHUTDOWN,
37 STATE_HALT,
38 __STATE_MAX,
39 };
40
41 static int state = STATE_NONE;
42 static int reboot_event;
43
44 static void set_stdio(const char* tty)
45 {
46 if (chdir("/dev") ||
47 !freopen(tty, "r", stdin) ||
48 !freopen(tty, "w", stdout) ||
49 !freopen(tty, "w", stderr) ||
50 chdir("/"))
51 ERROR("failed to set stdio\n");
52 else
53 fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
54 }
55
56 static void set_console(void)
57 {
58 const char* tty;
59 char* split;
60 char line[ 20 ];
61 const char* try[] = { "tty0", "console", NULL }; /* Try the most common outputs */
62 int f, i = 0;
63
64 tty = get_cmdline_val("console",line,sizeof(line));
65 if (tty != NULL) {
66 split = strchr(tty, ',');
67 if ( split != NULL )
68 *split = '\0';
69 } else {
70 // Try a default
71 tty=try[i];
72 i++;
73 }
74
75 if (chdir("/dev")) {
76 ERROR("failed to change dir to /dev\n");
77 return;
78 }
79 while (tty!=NULL) {
80 f = open(tty, O_RDONLY);
81 if (f >= 0) {
82 close(f);
83 break;
84 }
85
86 tty=try[i];
87 i++;
88 }
89 if (chdir("/"))
90 ERROR("failed to change dir to /\n");
91
92 if (tty != NULL)
93 set_stdio(tty);
94 }
95
96 static void state_enter(void)
97 {
98 char ubus_cmd[] = "/sbin/ubusd";
99
100 switch (state) {
101 case STATE_EARLY:
102 LOG("- early -\n");
103 watchdog_init(0);
104 hotplug("/etc/hotplug.json");
105 procd_coldplug();
106 break;
107
108 case STATE_UBUS:
109 // try to reopen incase the wdt was not available before coldplug
110 watchdog_init(0);
111 set_stdio("console");
112 LOG("- ubus -\n");
113 procd_connect_ubus();
114 service_start_early("ubus", ubus_cmd);
115 break;
116
117 case STATE_INIT:
118 LOG("- init -\n");
119 procd_inittab();
120 procd_inittab_run("respawn");
121 procd_inittab_run("askconsole");
122 procd_inittab_run("askfirst");
123 procd_inittab_run("sysinit");
124
125 // switch to syslog log channel
126 ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
127 break;
128
129 case STATE_RUNNING:
130 LOG("- init complete -\n");
131 procd_inittab_run("respawnlate");
132 procd_inittab_run("askconsolelate");
133 break;
134
135 case STATE_SHUTDOWN:
136 /* Redirect output to the console for the users' benefit */
137 set_console();
138 LOG("- shutdown -\n");
139 procd_inittab_run("shutdown");
140 sync();
141 break;
142
143 case STATE_HALT:
144 // To prevent killed processes from interrupting the sleep
145 signal(SIGCHLD, SIG_IGN);
146 LOG("- SIGTERM processes -\n");
147 kill(-1, SIGTERM);
148 sync();
149 sleep(1);
150 LOG("- SIGKILL processes -\n");
151 kill(-1, SIGKILL);
152 sync();
153 sleep(1);
154 #ifndef DISABLE_INIT
155 if (reboot_event == RB_POWER_OFF)
156 LOG("- power down -\n");
157 else
158 LOG("- reboot -\n");
159
160 /* Allow time for last message to reach serial console, etc */
161 sleep(1);
162
163 /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS)
164 * in linux/kernel/sys.c, which can cause the machine to panic when
165 * the init process exits... */
166 if (!vfork( )) { /* child */
167 reboot(reboot_event);
168 _exit(EXIT_SUCCESS);
169 }
170 while (1)
171 sleep(1);
172 #else
173 exit(0);
174 #endif
175 break;
176
177 default:
178 ERROR("Unhandled state %d\n", state);
179 return;
180 };
181 }
182
183 void procd_state_next(void)
184 {
185 DEBUG(4, "Change state %d -> %d\n", state, state + 1);
186 state++;
187 state_enter();
188 }
189
190 void procd_state_ubus_connect(void)
191 {
192 if (state == STATE_UBUS)
193 procd_state_next();
194 }
195
196 void procd_shutdown(int event)
197 {
198 if (state >= STATE_SHUTDOWN)
199 return;
200 DEBUG(2, "Shutting down system with event %x\n", event);
201 reboot_event = event;
202 state = STATE_SHUTDOWN;
203 state_enter();
204 }