ioctl參數命令設置

#define SCULL_IOC_MAGIC 'k'

#define SCULL_IOCRESET _IO(SCULL_IOC_MAGIC, 0)

#define SCULL_IOCSQUANTUM _IOW(SCULL_IOC_MAGIC, 1, int)

#define SCULL_IOCSQSET _IOW(SCULL_IOC_MAGIC, 2, int)

#define SCULL_IOCTQUANTUM _IO(SCULL_IOC_MAGIC, 3)

#define SCULL_IOCTQSET _IO(SCULL_IOC_MAGIC, 4)

#define SCULL_IOCGQUANTUM _IOR(SCULL_IOC_MAGIC, 5, int)

#define SCULL_IOCGQSET _IOR(SCULL_IOC_MAGIC, 6, int)

#define SCULL_IOCQQUANTUM _IO(SCULL_IOC_MAGIC, 7)

#define SCULL_IOCQQSET _IO(SCULL_IOC_MAGIC, 8)

#define SCULL_IOCXQUANTUM _IOWR(SCULL_IOC_MAGIC, 9, int)

#define SCULL_IOCXQSET _IOWR(SCULL_IOC_MAGIC,10, int)

#define SCULL_IOCHQUANTUM _IO(SCULL_IOC_MAGIC, 11)

#define SCULL_IOCHQSET _IO(SCULL_IOC_MAGIC, 12)

    以上是lld3中定義ioctl的命令，首先要定義一個不與已用MAGIC數衝突的幻數；_IO爲不帶參數的命令；_IOR爲讀驅動數據的命令（put_user將數據傳給用戶層）；_IORW,_IOW類推。

    注：（是否只有按上述宏定義，才能獲得相應的與應用層IO的權限？）