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
|
/*
* 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 <linux/watchdog.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <libubox/uloop.h>
#include "procd.h"
#include "watchdog.h"
#define WDT_PATH "/dev/watchdog"
static struct uloop_timeout wdt_timeout;
static int wdt_fd = -1;
static int wdt_frequency = 5;
void watchdog_ping(void)
{
DEBUG(4, "Ping\n");
if (write(wdt_fd, "X", 1) < 0)
ERROR("WDT failed to write: %s\n", strerror(errno));
}
static void watchdog_timeout_cb(struct uloop_timeout *t)
{
watchdog_ping();
uloop_timeout_set(t, wdt_frequency * 1000);
}
void watchdog_set_stopped(bool val)
{
if (val)
uloop_timeout_cancel(&wdt_timeout);
else
watchdog_timeout_cb(&wdt_timeout);
}
bool watchdog_get_stopped(void)
{
return !wdt_timeout.pending;
}
int watchdog_timeout(int timeout)
{
if (wdt_fd < 0)
return 0;
if (timeout) {
DEBUG(4, "Set watchdog timeout: %ds\n", timeout);
ioctl(wdt_fd, WDIOC_SETTIMEOUT, &timeout);
}
ioctl(wdt_fd, WDIOC_GETTIMEOUT, &timeout);
return timeout;
}
int watchdog_frequency(int frequency)
{
if (wdt_fd < 0)
return 0;
if (frequency) {
DEBUG(4, "Set watchdog frequency: %ds\n", frequency);
wdt_frequency = frequency;
}
return wdt_frequency;
}
char* watchdog_fd(void)
{
static char fd_buf[3];
if (wdt_fd < 0)
return NULL;
snprintf(fd_buf, sizeof(fd_buf), "%d", wdt_fd);
return fd_buf;
}
void watchdog_init(int preinit)
{
char *env = getenv("WDTFD");
if (wdt_fd >= 0)
return;
wdt_timeout.cb = watchdog_timeout_cb;
if (env) {
DEBUG(2, "Watchdog handover: fd=%s\n", env);
wdt_fd = atoi(env);
unsetenv("WDTFD");
} else {
wdt_fd = open("/dev/watchdog", O_WRONLY);
}
if (wdt_fd < 0)
return;
if (!preinit)
fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) | FD_CLOEXEC);
LOG("- watchdog -\n");
watchdog_timeout(30);
watchdog_timeout_cb(&wdt_timeout);
DEBUG(4, "Opened watchdog with timeout %ds\n", watchdog_timeout(0));
}
void watchdog_no_cloexec(void)
{
if (wdt_fd < 0)
return;
fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) & ~FD_CLOEXEC);
}
|