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 14int 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 */ 21void 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 */ 32int 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} 69