生产现场设备检测完正确亮绿灯不正确亮红灯

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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……