看门狗的开启与使用方法

/dev/watchdog字符设备直接打开进行操作即可。

#define WATCHDOG_DEV            "/dev/watchdog" 

#define WATCHDOG_IOCTL_BASE     'W'
#define WDIOC_KEEPALIVE         _IOR(WATCHDOG_IOCTL_BASE, 5, int)

int fd = -1;
fd = open(WATCHDOG_DEV, O_RDWR, 0);

/* Feed */
ioctl(fd, WDIOC_KEEPALIVE);

/* Disable */
char ch = 'V';
write(fd, &ch, 1);