wtd-d501.c

嵌入式linux环境下 mx系列 看门狗的测试程序。

//Copy from Documentation\watchdog.txt  Example Watchdog Driver
//xtp-d501
//-----------------------

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/watchdog.h>

int main(int argc, char *argv[])
{
	int fd,sleepval,mode,ret;
	unsigned long setval;

	if(argc < 4){
		printf("Usage:%s [timeout][sleep][mode]\n",argv[0]);
		printf("  timeout:value in seconds to cause wdt timeout/reset\n");
		printf("  sleep:  value in seconds to service the wdt\n");
		printf("  mode:   0/Service wdt with ioctl(), 1/with write()\n");
		return 0;
		}

	fd = open("/dev/misc/watchdog",O_WRONLY);
	if(fd < 0)
	{
		printf("dev/misc/watchdog can't open! \n");
		return 1;
	}
	else printf("/dev/misc/watchdog/: fd = %d \n", fd);
	
	setval = atoi(argv[1]);
	sleepval = atoi(argv[2]);
	mode = atoi(argv[3]);
	printf("%d %d %d\n",(int)setval,sleepval,mode);
	
	ret = ioctl(fd,WDIOC_SETTIMEOUT,&setval);
	if(ret != 0)
		printf("set timeout fail,default=60 sec\n");
	//setval = ioctl(fd,WDIOC_GETTIMEOUT,setval);
	//printf("%d %d %d\n",(int)setval,sleepval,mode);
		

	while(1){
		if(mode == 1)	
			write(fd,"\0",1);
		else{
			ret = ioctl(fd,WDIOC_KEEPALIVE,0);
			printf("ret %d\n",ret);
		}
		printf("service ok\n");
		sleep(sleepval);
	}
	return 0;
}