cad19fa664
we start a infinite loop when user gives ./watchdog-test, and when user ctrl + c's the program, we just exit immeadiately with out closing the filedescriptor of the watchdog device. a signal handler is used to do the job of closing the filedescriptor and exiting the program. Signed-off-by: Devendra Naga <devendra.aaru@gmail.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*
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* Watchdog Driver Test Program
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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int fd;
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/*
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* This function simply sends an IOCTL to the driver, which in turn ticks
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* the PC Watchdog card to reset its internal timer so it doesn't trigger
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* a computer reset.
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*/
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static void keep_alive(void)
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{
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int dummy;
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ioctl(fd, WDIOC_KEEPALIVE, &dummy);
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}
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/*
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* The main program. Run the program with "-d" to disable the card,
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* or "-e" to enable the card.
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*/
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void term(int sig)
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{
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close(fd);
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fprintf(stderr, "Stopping watchdog ticks...\n");
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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int flags;
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fd = open("/dev/watchdog", O_WRONLY);
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if (fd == -1) {
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fprintf(stderr, "Watchdog device not enabled.\n");
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fflush(stderr);
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exit(-1);
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}
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if (argc > 1) {
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if (!strncasecmp(argv[1], "-d", 2)) {
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flags = WDIOS_DISABLECARD;
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ioctl(fd, WDIOC_SETOPTIONS, &flags);
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fprintf(stderr, "Watchdog card disabled.\n");
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fflush(stderr);
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goto end;
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} else if (!strncasecmp(argv[1], "-e", 2)) {
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flags = WDIOS_ENABLECARD;
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ioctl(fd, WDIOC_SETOPTIONS, &flags);
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fprintf(stderr, "Watchdog card enabled.\n");
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fflush(stderr);
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goto end;
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} else {
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fprintf(stderr, "-d to disable, -e to enable.\n");
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fprintf(stderr, "run by itself to tick the card.\n");
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fflush(stderr);
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goto end;
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}
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} else {
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fprintf(stderr, "Watchdog Ticking Away!\n");
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fflush(stderr);
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}
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signal(SIGINT, term);
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while(1) {
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keep_alive();
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sleep(1);
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}
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end:
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close(fd);
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return 0;
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}
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