svn commit: r331077 - head/sys/sys

Brooks Davis brooks at FreeBSD.org
Fri Mar 16 22:23:05 UTC 2018


Author: brooks
Date: Fri Mar 16 22:23:04 2018
New Revision: 331077
URL: https://svnweb.freebsd.org/changeset/base/331077

Log:
  Add _IOC_NEWLEN() and _IOC_NEWTYPE() macros.
  
  These macros take an existing ioctl(2) command and replace the length
  with the specified length or length of the specified type respectively.
  These can be used to define commands for 32-bit compatibility with fewer
  opportunities for cut-and-paste errors then a whole new definition.
  
  Reviewed by:	cem, kib
  Obtained from:	CheriBSD
  Sponsored by:	DARPA, AFRL
  Differential Revision:	https://reviews.freebsd.org/D14706

Modified:
  head/sys/sys/ioccom.h

Modified: head/sys/sys/ioccom.h
==============================================================================
--- head/sys/sys/ioccom.h	Fri Mar 16 21:10:36 2018	(r331076)
+++ head/sys/sys/ioccom.h	Fri Mar 16 22:23:04 2018	(r331077)
@@ -61,6 +61,10 @@
 #define	_IOW(g,n,t)	_IOC(IOC_IN,	(g), (n), sizeof(t))
 /* this should be _IORW, but stdio got there first */
 #define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))
+/* Replace length/type in an ioctl command. */
+#define	_IOC_NEWLEN(ioc, len) \
+    (((~(IOCPARM_MASK << 16)) & (ioc)) | (((len) & IOCPARM_MASK) << 16))
+#define	_IOC_NEWTYPE(ioc, type)	_IOC_NEWLEN((ioc), sizeof(type))
 
 #ifdef _KERNEL
 


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