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 */ 21static 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 */ 32int main(int argc, char *argv[]) 33{ 34 int flags; 35 36 fd = open("/dev/watchdog", O_WRONLY); 37 38 if (fd == -1) { 39 fprintf(stderr, "Watchdog device not enabled.\n"); 40 fflush(stderr); 41 exit(-1); 42 } 43 44 if (argc > 1) { 45 if (!strncasecmp(argv[1], "-d", 2)) { 46 flags = WDIOS_DISABLECARD; 47 ioctl(fd, WDIOC_SETOPTIONS, &flags); 48 fprintf(stderr, "Watchdog card disabled.\n"); 49 fflush(stderr); 50 exit(0); 51 } else if (!strncasecmp(argv[1], "-e", 2)) { 52 flags = WDIOS_ENABLECARD; 53 ioctl(fd, WDIOC_SETOPTIONS, &flags); 54 fprintf(stderr, "Watchdog card enabled.\n"); 55 fflush(stderr); 56 exit(0); 57 } else { 58 fprintf(stderr, "-d to disable, -e to enable.\n"); 59 fprintf(stderr, "run by itself to tick the card.\n"); 60 fflush(stderr); 61 exit(0); 62 } 63 } else { 64 fprintf(stderr, "Watchdog Ticking Away!\n"); 65 fflush(stderr); 66 } 67 68 while(1) { 69 keep_alive(); 70 sleep(1); 71 } 72} 73