diff options
Diffstat (limited to 'Documentation/watchdog')
-rw-r--r-- | Documentation/watchdog/pcwd-watchdog.txt | 75 | ||||
-rw-r--r-- | Documentation/watchdog/src/watchdog-simple.c | 15 | ||||
-rw-r--r-- | Documentation/watchdog/src/watchdog-test.c | 68 | ||||
-rw-r--r-- | Documentation/watchdog/watchdog-api.txt | 17 | ||||
-rw-r--r-- | Documentation/watchdog/watchdog.txt | 23 |
5 files changed, 88 insertions, 110 deletions
diff --git a/Documentation/watchdog/pcwd-watchdog.txt b/Documentation/watchdog/pcwd-watchdog.txt index 12187a33e310..d9ee6336c1d4 100644 --- a/Documentation/watchdog/pcwd-watchdog.txt +++ b/Documentation/watchdog/pcwd-watchdog.txt | |||
@@ -22,78 +22,9 @@ | |||
22 | to run the program with an "&" to run it in the background!) | 22 | to run the program with an "&" to run it in the background!) |
23 | 23 | ||
24 | If you want to write a program to be compatible with the PC Watchdog | 24 | If you want to write a program to be compatible with the PC Watchdog |
25 | driver, simply do the following: | 25 | driver, simply use of modify the watchdog test program: |
26 | 26 | Documentation/watchdog/src/watchdog-test.c | |
27 | -- Snippet of code -- | 27 | |
28 | /* | ||
29 | * Watchdog Driver Test Program | ||
30 | */ | ||
31 | |||
32 | #include <stdio.h> | ||
33 | #include <stdlib.h> | ||
34 | #include <string.h> | ||
35 | #include <unistd.h> | ||
36 | #include <fcntl.h> | ||
37 | #include <sys/ioctl.h> | ||
38 | #include <linux/types.h> | ||
39 | #include <linux/watchdog.h> | ||
40 | |||
41 | int fd; | ||
42 | |||
43 | /* | ||
44 | * This function simply sends an IOCTL to the driver, which in turn ticks | ||
45 | * the PC Watchdog card to reset its internal timer so it doesn't trigger | ||
46 | * a computer reset. | ||
47 | */ | ||
48 | void keep_alive(void) | ||
49 | { | ||
50 | int dummy; | ||
51 | |||
52 | ioctl(fd, WDIOC_KEEPALIVE, &dummy); | ||
53 | } | ||
54 | |||
55 | /* | ||
56 | * The main program. Run the program with "-d" to disable the card, | ||
57 | * or "-e" to enable the card. | ||
58 | */ | ||
59 | int main(int argc, char *argv[]) | ||
60 | { | ||
61 | fd = open("/dev/watchdog", O_WRONLY); | ||
62 | |||
63 | if (fd == -1) { | ||
64 | fprintf(stderr, "Watchdog device not enabled.\n"); | ||
65 | fflush(stderr); | ||
66 | exit(-1); | ||
67 | } | ||
68 | |||
69 | if (argc > 1) { | ||
70 | if (!strncasecmp(argv[1], "-d", 2)) { | ||
71 | ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD); | ||
72 | fprintf(stderr, "Watchdog card disabled.\n"); | ||
73 | fflush(stderr); | ||
74 | exit(0); | ||
75 | } else if (!strncasecmp(argv[1], "-e", 2)) { | ||
76 | ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD); | ||
77 | fprintf(stderr, "Watchdog card enabled.\n"); | ||
78 | fflush(stderr); | ||
79 | exit(0); | ||
80 | } else { | ||
81 | fprintf(stderr, "-d to disable, -e to enable.\n"); | ||
82 | fprintf(stderr, "run by itself to tick the card.\n"); | ||
83 | fflush(stderr); | ||
84 | exit(0); | ||
85 | } | ||
86 | } else { | ||
87 | fprintf(stderr, "Watchdog Ticking Away!\n"); | ||
88 | fflush(stderr); | ||
89 | } | ||
90 | |||
91 | while(1) { | ||
92 | keep_alive(); | ||
93 | sleep(1); | ||
94 | } | ||
95 | } | ||
96 | -- End snippet -- | ||
97 | 28 | ||
98 | Other IOCTL functions include: | 29 | Other IOCTL functions include: |
99 | 30 | ||
diff --git a/Documentation/watchdog/src/watchdog-simple.c b/Documentation/watchdog/src/watchdog-simple.c new file mode 100644 index 000000000000..85cf17c48669 --- /dev/null +++ b/Documentation/watchdog/src/watchdog-simple.c | |||
@@ -0,0 +1,15 @@ | |||
1 | #include <stdlib.h> | ||
2 | #include <fcntl.h> | ||
3 | |||
4 | int main(int argc, const char *argv[]) { | ||
5 | int fd = open("/dev/watchdog", O_WRONLY); | ||
6 | if (fd == -1) { | ||
7 | perror("watchdog"); | ||
8 | exit(1); | ||
9 | } | ||
10 | while (1) { | ||
11 | write(fd, "\0", 1); | ||
12 | fsync(fd); | ||
13 | sleep(10); | ||
14 | } | ||
15 | } | ||
diff --git a/Documentation/watchdog/src/watchdog-test.c b/Documentation/watchdog/src/watchdog-test.c new file mode 100644 index 000000000000..65f6c19cb865 --- /dev/null +++ b/Documentation/watchdog/src/watchdog-test.c | |||
@@ -0,0 +1,68 @@ | |||
1 | /* | ||
2 | * Watchdog Driver Test Program | ||
3 | */ | ||
4 | |||
5 | #include <stdio.h> | ||
6 | #include <stdlib.h> | ||
7 | #include <string.h> | ||
8 | #include <unistd.h> | ||
9 | #include <fcntl.h> | ||
10 | #include <sys/ioctl.h> | ||
11 | #include <linux/types.h> | ||
12 | #include <linux/watchdog.h> | ||
13 | |||
14 | int fd; | ||
15 | |||
16 | /* | ||
17 | * This function simply sends an IOCTL to the driver, which in turn ticks | ||
18 | * the PC Watchdog card to reset its internal timer so it doesn't trigger | ||
19 | * a computer reset. | ||
20 | */ | ||
21 | void keep_alive(void) | ||
22 | { | ||
23 | int dummy; | ||
24 | |||
25 | ioctl(fd, WDIOC_KEEPALIVE, &dummy); | ||
26 | } | ||
27 | |||
28 | /* | ||
29 | * The main program. Run the program with "-d" to disable the card, | ||
30 | * or "-e" to enable the card. | ||
31 | */ | ||
32 | int main(int argc, char *argv[]) | ||
33 | { | ||
34 | fd = open("/dev/watchdog", O_WRONLY); | ||
35 | |||
36 | if (fd == -1) { | ||
37 | fprintf(stderr, "Watchdog device not enabled.\n"); | ||
38 | fflush(stderr); | ||
39 | exit(-1); | ||
40 | } | ||
41 | |||
42 | if (argc > 1) { | ||
43 | if (!strncasecmp(argv[1], "-d", 2)) { | ||
44 | ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD); | ||
45 | fprintf(stderr, "Watchdog card disabled.\n"); | ||
46 | fflush(stderr); | ||
47 | exit(0); | ||
48 | } else if (!strncasecmp(argv[1], "-e", 2)) { | ||
49 | ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD); | ||
50 | fprintf(stderr, "Watchdog card enabled.\n"); | ||
51 | fflush(stderr); | ||
52 | exit(0); | ||
53 | } else { | ||
54 | fprintf(stderr, "-d to disable, -e to enable.\n"); | ||
55 | fprintf(stderr, "run by itself to tick the card.\n"); | ||
56 | fflush(stderr); | ||
57 | exit(0); | ||
58 | } | ||
59 | } else { | ||
60 | fprintf(stderr, "Watchdog Ticking Away!\n"); | ||
61 | fflush(stderr); | ||
62 | } | ||
63 | |||
64 | while(1) { | ||
65 | keep_alive(); | ||
66 | sleep(1); | ||
67 | } | ||
68 | } | ||
diff --git a/Documentation/watchdog/watchdog-api.txt b/Documentation/watchdog/watchdog-api.txt index d738ec25eaa4..958ff3d48be3 100644 --- a/Documentation/watchdog/watchdog-api.txt +++ b/Documentation/watchdog/watchdog-api.txt | |||
@@ -34,22 +34,7 @@ activates as soon as /dev/watchdog is opened and will reboot unless | |||
34 | the watchdog is pinged within a certain time, this time is called the | 34 | the watchdog is pinged within a certain time, this time is called the |
35 | timeout or margin. The simplest way to ping the watchdog is to write | 35 | timeout or margin. The simplest way to ping the watchdog is to write |
36 | some data to the device. So a very simple watchdog daemon would look | 36 | some data to the device. So a very simple watchdog daemon would look |
37 | like this: | 37 | like this source file: see Documentation/watchdog/src/watchdog-simple.c |
38 | |||
39 | #include <stdlib.h> | ||
40 | #include <fcntl.h> | ||
41 | |||
42 | int main(int argc, const char *argv[]) { | ||
43 | int fd=open("/dev/watchdog",O_WRONLY); | ||
44 | if (fd==-1) { | ||
45 | perror("watchdog"); | ||
46 | exit(1); | ||
47 | } | ||
48 | while(1) { | ||
49 | write(fd, "\0", 1); | ||
50 | sleep(10); | ||
51 | } | ||
52 | } | ||
53 | 38 | ||
54 | A more advanced driver could for example check that a HTTP server is | 39 | A more advanced driver could for example check that a HTTP server is |
55 | still responding before doing the write call to ping the watchdog. | 40 | still responding before doing the write call to ping the watchdog. |
diff --git a/Documentation/watchdog/watchdog.txt b/Documentation/watchdog/watchdog.txt index dffda29c8799..4b1ff69cc19a 100644 --- a/Documentation/watchdog/watchdog.txt +++ b/Documentation/watchdog/watchdog.txt | |||
@@ -65,28 +65,7 @@ The external event interfaces on the WDT boards are not currently supported. | |||
65 | Minor numbers are however allocated for it. | 65 | Minor numbers are however allocated for it. |
66 | 66 | ||
67 | 67 | ||
68 | Example Watchdog Driver | 68 | Example Watchdog Driver: see Documentation/watchdog/src/watchdog-simple.c |
69 | ----------------------- | ||
70 | |||
71 | #include <stdio.h> | ||
72 | #include <unistd.h> | ||
73 | #include <fcntl.h> | ||
74 | |||
75 | int main(int argc, const char *argv[]) | ||
76 | { | ||
77 | int fd=open("/dev/watchdog",O_WRONLY); | ||
78 | if(fd==-1) | ||
79 | { | ||
80 | perror("watchdog"); | ||
81 | exit(1); | ||
82 | } | ||
83 | while(1) | ||
84 | { | ||
85 | write(fd,"\0",1); | ||
86 | fsync(fd); | ||
87 | sleep(10); | ||
88 | } | ||
89 | } | ||
90 | 69 | ||
91 | 70 | ||
92 | Contact Information | 71 | Contact Information |