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Documentation / watchdog / src / watchdog-test.c




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Based on kernel version 4.8. Page generated on 2016-10-06 23:19 EST.

1	/*
2	 * Watchdog Driver Test Program
3	 */
4	
5	#include <errno.h>
6	#include <stdio.h>
7	#include <stdlib.h>
8	#include <string.h>
9	#include <unistd.h>
10	#include <fcntl.h>
11	#include <signal.h>
12	#include <sys/ioctl.h>
13	#include <linux/types.h>
14	#include <linux/watchdog.h>
15	
16	int fd;
17	const char v = 'V';
18	
19	/*
20	 * This function simply sends an IOCTL to the driver, which in turn ticks
21	 * the PC Watchdog card to reset its internal timer so it doesn't trigger
22	 * a computer reset.
23	 */
24	static void keep_alive(void)
25	{
26	    int dummy;
27	
28	    printf(".");
29	    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
30	}
31	
32	/*
33	 * The main program.  Run the program with "-d" to disable the card,
34	 * or "-e" to enable the card.
35	 */
36	
37	static void term(int sig)
38	{
39	    int ret = write(fd, &v, 1);
40	
41	    close(fd);
42	    if (ret < 0)
43		printf("\nStopping watchdog ticks failed (%d)...\n", errno);
44	    else
45		printf("\nStopping watchdog ticks...\n");
46	    exit(0);
47	}
48	
49	int main(int argc, char *argv[])
50	{
51	    int flags;
52	    unsigned int ping_rate = 1;
53	    int ret;
54	
55	    setbuf(stdout, NULL);
56	
57	    fd = open("/dev/watchdog", O_WRONLY);
58	
59	    if (fd == -1) {
60		printf("Watchdog device not enabled.\n");
61		exit(-1);
62	    }
63	
64	    if (argc > 1) {
65		if (!strncasecmp(argv[1], "-d", 2)) {
66		    flags = WDIOS_DISABLECARD;
67		    ioctl(fd, WDIOC_SETOPTIONS, &flags);
68		    printf("Watchdog card disabled.\n");
69		    goto end;
70		} else if (!strncasecmp(argv[1], "-e", 2)) {
71		    flags = WDIOS_ENABLECARD;
72		    ioctl(fd, WDIOC_SETOPTIONS, &flags);
73		    printf("Watchdog card enabled.\n");
74		    goto end;
75		} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
76		    flags = atoi(argv[2]);
77		    ioctl(fd, WDIOC_SETTIMEOUT, &flags);
78		    printf("Watchdog timeout set to %u seconds.\n", flags);
79		    goto end;
80		} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
81		    ping_rate = strtoul(argv[2], NULL, 0);
82		    printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
83		} else {
84		    printf("-d to disable, -e to enable, -t <n> to set " \
85			"the timeout,\n-p <n> to set the ping rate, and \n");
86		    printf("run by itself to tick the card.\n");
87		    goto end;
88		}
89	    }
90	
91	    printf("Watchdog Ticking Away!\n");
92	
93	    signal(SIGINT, term);
94	
95	    while(1) {
96		keep_alive();
97		sleep(ping_rate);
98	    }
99	end:
100	    ret = write(fd, &v, 1);
101	    if (ret < 0)
102		printf("Stopping watchdog ticks failed (%d)...\n", errno);
103	    close(fd);
104	    return 0;
105	}
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