summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/watchdog/watchdog-test.c
blob: 6e290874b70e212e72c0f337bbdb597036d00d48 (plain)
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
// SPDX-License-Identifier: GPL-2.0
/*
 * Watchdog Driver Test Program
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/watchdog.h>

#define DEFAULT_PING_RATE	1

int fd;
const char v = 'V';
static const char sopts[] = "bdehp:t:";
static const struct option lopts[] = {
	{"bootstatus",          no_argument, NULL, 'b'},
	{"disable",             no_argument, NULL, 'd'},
	{"enable",              no_argument, NULL, 'e'},
	{"help",                no_argument, NULL, 'h'},
	{"pingrate",      required_argument, NULL, 'p'},
	{"timeout",       required_argument, NULL, 't'},
	{NULL,                  no_argument, NULL, 0x0}
};

/*
 * This function simply sends an IOCTL to the driver, which in turn ticks
 * the PC Watchdog card to reset its internal timer so it doesn't trigger
 * a computer reset.
 */
static void keep_alive(void)
{
	int dummy;
	int ret;

	ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
	if (!ret)
		printf(".");
}

/*
 * The main program.  Run the program with "-d" to disable the card,
 * or "-e" to enable the card.
 */

static void term(int sig)
{
	int ret = write(fd, &v, 1);

	close(fd);
	if (ret < 0)
		printf("\nStopping watchdog ticks failed (%d)...\n", errno);
	else
		printf("\nStopping watchdog ticks...\n");
	exit(0);
}

static void usage(char *progname)
{
	printf("Usage: %s [options]\n", progname);
	printf(" -b, --bootstatus    Get last boot status (Watchdog/POR)\n");
	printf(" -d, --disable       Turn off the watchdog timer\n");
	printf(" -e, --enable        Turn on the watchdog timer\n");
	printf(" -h, --help          Print the help message\n");
	printf(" -p, --pingrate=P    Set ping rate to P seconds (default %d)\n", DEFAULT_PING_RATE);
	printf(" -t, --timeout=T     Set timeout to T seconds\n");
	printf("\n");
	printf("Parameters are parsed left-to-right in real-time.\n");
	printf("Example: %s -d -t 10 -p 5 -e\n", progname);
}

int main(int argc, char *argv[])
{
	int flags;
	unsigned int ping_rate = DEFAULT_PING_RATE;
	int ret;
	int c;
	int oneshot = 0;

	setbuf(stdout, NULL);

	fd = open("/dev/watchdog", O_WRONLY);

	if (fd == -1) {
		printf("Watchdog device not enabled.\n");
		exit(-1);
	}

	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
		switch (c) {
		case 'b':
			flags = 0;
			oneshot = 1;
			ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
			if (!ret)
				printf("Last boot is caused by: %s.\n", (flags != 0) ?
					"Watchdog" : "Power-On-Reset");
			else
				printf("WDIOC_GETBOOTSTATUS errno '%s'\n", strerror(errno));
			break;
		case 'd':
			flags = WDIOS_DISABLECARD;
			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
			if (!ret)
				printf("Watchdog card disabled.\n");
			else
				printf("WDIOS_DISABLECARD errno '%s'\n", strerror(errno));
			break;
		case 'e':
			flags = WDIOS_ENABLECARD;
			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
			if (!ret)
				printf("Watchdog card enabled.\n");
			else
				printf("WDIOS_ENABLECARD errno '%s'\n", strerror(errno));
			break;
		case 'p':
			ping_rate = strtoul(optarg, NULL, 0);
			if (!ping_rate)
				ping_rate = DEFAULT_PING_RATE;
			printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
			break;
		case 't':
			flags = strtoul(optarg, NULL, 0);
			ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
			if (!ret)
				printf("Watchdog timeout set to %u seconds.\n", flags);
			else
				printf("WDIOC_SETTIMEOUT errno '%s'\n", strerror(errno));
			break;
		default:
			usage(argv[0]);
			goto end;
		}
	}

	if (oneshot)
		goto end;

	printf("Watchdog Ticking Away!\n");

	signal(SIGINT, term);

	while (1) {
		keep_alive();
		sleep(ping_rate);
	}
end:
	ret = write(fd, &v, 1);
	if (ret < 0)
		printf("Stopping watchdog ticks failed (%d)...\n", errno);
	close(fd);
	return 0;
}