soft_watchdog.c

来自「台湾上尚公司linux嵌入式服务器平台软件狗操作源码」· C语言 代码 · 共 44 行

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/types.h>
#include <linux/watchdog.h>

int main(int argc, char ** argv) {
	int fd;
	unsigned char data;
    int timeout, tmp;

    if (argc != 2) {
        printf("soft_watchdog timeout\n");
        return 0;
    }
    timeout = atoi(argv[1]);

    do {
        usleep(100000);
        fd = open("/dev/misc/watchdog", O_RDWR);
    } while (fd < 0);

    // set watchdog timeout value (sec)
    ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
    ioctl(fd, WDIOC_GETTIMEOUT, &tmp);
    printf("timeout = %d sec\n", tmp);
    tmp *= 100000;

#if 1
    data = 1;
    while (1) {
        // write a value to refresh the timer
        write(fd, &data, 1);
        usleep(tmp);
    }
#endif

	close(fd);

	return 0;
}