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Add _IOC_NEWLEN() and _IOC_NEWTYPE() macros.

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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
This commit is contained in:
brooks 2018-03-16 22:23:04 +00:00
parent ef1175daa3
commit 108df59632
1 changed files with 4 additions and 0 deletions
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4
sys/sys/ioccom.h
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@ -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