tag	line	file	source code
_IOW	48	include/asm-alpha/ioctl.h	#define _IOW(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
_IOW	47	include/linux/ioctl.h	#define _IOW(c,d,t)  (IOC_IN | ((sizeof(t)<<16) & IOCSIZE_MASK) | \
_IOW	101	include/linux/soundcard.h	#define  _IOW(x,y,t)  ((int)(IOC_IN|((sizeof(t)&IOCPARM_MASK)<<16)|(x<<8)|y))