c语言设置led指示灯状态(open)

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void set_led_blink(char *path , int state) {     int fd;     char buf;       switch(state)     {         case 0:             buf = '0';             break;         case 1:             buf = '1';             break;         case 2:             buf = '2';             break;         default:             break;     }       fd = open(path,O_RDWR);     write(fd,&buf,sizeof(buf));     close(fd); }