Date: Sat, 14 Apr 2018 12:52:34 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r332502 - stable/11/sys/sys Message-ID: <201804141252.w3ECqYnd048336@repo.freebsd.org>
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Author: emaste Date: Sat Apr 14 12:52:34 2018 New Revision: 332502 URL: https://svnweb.freebsd.org/changeset/base/332502 Log: MFC r331077 (brooks): 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. Obtained from: CheriBSD Sponsored by: DARPA, AFRL Modified: stable/11/sys/sys/ioccom.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/sys/ioccom.h ============================================================================== --- stable/11/sys/sys/ioccom.h Sat Apr 14 12:07:05 2018 (r332501) +++ stable/11/sys/sys/ioccom.h Sat Apr 14 12:52:34 2018 (r332502) @@ -59,6 +59,10 @@ #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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