Raspberry Pi のACT LEDを点灯させるC++プログラム

ただの，メモです．

# include <fcntl.h> //for O_RDWR
# include <unistd.h> //for open, close

int main(int argc, char** args) {
    /*O_RDWR は読み書きどちらも許可するモード*/
    /*PWR LEDを点灯させるときは，led1に変更する*/
    int trigger = open("/sys/class/leds/led0/trigger"      , O_RDWR); 
    int bright  = open("/sys/class/leds/led0/brightness", O_RDWR); 
    
    //初期化的なの
    write(trigger, (char*) "none", 4); //3rd arg is the size of 2nd arg
    
    //ACT点灯
    write(bright, (char*) "1", 1);
    //3秒休止
    sleep(3);
    //ACT消灯
    write(bright, (char*) "0", 1);
    
    //終了処理的なの
    write(trigger, (char*) "mmc0", 4); //メモリアクセスでACT点滅に戻す
    
    close(bright);
    close(trigger);
}