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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