c语言设置led指示灯状态(open)

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);
}