tag	line	file	source code
IOC_IN	21	include/linux/ioctl.h	#define IOC_INOUT  (IOC_IN | IOC_OUT)  /* both */
IOC_IN	31	include/linux/ioctl.h	#define _IOW(c,d,t)  (IOC_IN | ((sizeof(t)<<16) & IOCSIZE_MASK) | \