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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* 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 <fcntl.h>
#include <sys/reboot.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include "procd.h"
#include "syslog.h"
#include "plug/hotplug.h"
#include "watchdog.h"
#include "service/service.h"
#include "utils/utils.h"
enum {
STATE_NONE = 0,
STATE_EARLY,
STATE_UBUS,
STATE_INIT,
STATE_RUNNING,
STATE_SHUTDOWN,
STATE_HALT,
__STATE_MAX,
};
static int state = STATE_NONE;
static int reboot_event;
static void set_stdio(const char* tty)
{
chdir("/dev");
freopen(tty, "r", stdin);
freopen(tty, "w", stdout);
freopen(tty, "w", stderr);
chdir("/");
fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
}
static void set_console(void)
{
const char* tty;
char* split;
char line[ 20 ];
const char* try[] = { "tty0", "console", NULL }; /* Try the most common outputs */
int f, i = 0;
tty = get_cmdline_val("console",line,sizeof(line));
if (tty != NULL) {
split = strchr(tty, ',');
if ( split != NULL )
*split = '\0';
} else {
// Try a default
tty=try[i];
i++;
}
chdir("/dev");
while (tty!=NULL) {
f = open(tty, O_RDONLY);
if (f >= 0) {
close(f);
break;
}
tty=try[i];
i++;
}
chdir("/");
if (tty != NULL)
set_stdio(tty);
}
static void state_enter(void)
{
char ubus_cmd[] = "/sbin/ubusd";
switch (state) {
case STATE_EARLY:
LOG("- early -\n");
watchdog_init(0);
hotplug("/etc/hotplug.json");
procd_coldplug();
break;
case STATE_UBUS:
// try to reopen incase the wdt was not available before coldplug
watchdog_init(0);
set_stdio("console");
LOG("- ubus -\n");
procd_connect_ubus();
service_init();
service_start_early("ubus", ubus_cmd);
break;
case STATE_INIT:
LOG("- init -\n");
procd_inittab();
procd_inittab_run("respawn");
procd_inittab_run("askconsole");
procd_inittab_run("askfirst");
procd_inittab_run("sysinit");
break;
case STATE_RUNNING:
LOG("- init complete -\n");
break;
case STATE_SHUTDOWN:
/* Redirect output to the console for the users' benefit */
set_console();
LOG("- shutdown -\n");
procd_inittab_run("shutdown");
sync();
break;
case STATE_HALT:
// To prevent killed processes from interrupting the sleep
signal(SIGCHLD, SIG_IGN);
LOG("- SIGTERM processes -\n");
kill(-1, SIGTERM);
sync();
sleep(1);
LOG("- SIGKILL processes -\n");
kill(-1, SIGKILL);
sync();
sleep(1);
if (reboot_event == RB_POWER_OFF)
LOG("- power down -\n");
else
LOG("- reboot -\n");
/* Allow time for last message to reach serial console, etc */
sleep(1);
/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS)
* in linux/kernel/sys.c, which can cause the machine to panic when
* the init process exits... */
if (!vfork( )) { /* child */
reboot(reboot_event);
_exit(EXIT_SUCCESS);
}
while (1)
sleep(1);
break;
default:
ERROR("Unhandled state %d\n", state);
return;
};
}
void procd_state_next(void)
{
DEBUG(4, "Change state %d -> %d\n", state, state + 1);
state++;
state_enter();
}
void procd_state_ubus_connect(void)
{
if (state == STATE_UBUS)
procd_state_next();
}
void procd_shutdown(int event)
{
if (state >= STATE_SHUTDOWN)
return;
DEBUG(2, "Shutting down system with event %x\n", event);
reboot_event = event;
state = STATE_SHUTDOWN;
state_enter();
}
|
