生产现场设备检测完正确亮绿灯不正确亮红灯

static int ReadGpioValue(int r)
{
	char commandBuf[COMMAND_BUF_MAX_SIZE] = {0};
	FILE *fp = NULL;
	int ret = -1, value = -1;
	
	snprintf(commandBuf, COMMAND_BUF_MAX_SIZE, "cat /sys/class/gpio/gpio%d/value > /tmp/resetgpio.txt", r);
	system(commandBuf);
	
	fp = fopen("/tmp/resetgpio.txt", "r");
	if(fp == NULL){printf("fopen error!\n"); return -1;}
	
	fscanf(fp, "%d", &value);
	
	fclose(fp);

	return value;
}

　　这几行代码就实现了生产现场设备检测完正确亮绿灯不正确亮红灯……有时候很简单的方法就是想不到……