tag	line	file	source code
_IOC_READ	47	include/asm-alpha/ioctl.h	#define _IOR(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
_IOC_READ	49	include/asm-alpha/ioctl.h	#define _IOWR(type,nr,size)  _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))