Integrate 4.4BSD-Lite2 changes to IOC_* definitions
Bring in the long-overdue 4.4BSD-Lite2 rev 8.3 by cgd of sys/ioccom.h. This uses UL suffix for the IOC_* constants so they don't sign extend. Also bring in the handy diagram from NetBSD's version of this file. This alters the 4.4BSD-Lite2 code slightly in a way that's semantically the same but more compact. This should stop the warnings from Chrome for bogus sign extension. Reviewed by: kib@, jhb@ Differential Revision: https://reviews.freebsd.org/D26423
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=367189
@ -28,7 +28,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ioccom.h 8.2 (Berkeley) 3/28/94
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* @(#)ioccom.h 8.3 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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@ -39,6 +39,11 @@
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* Ioctl's have the command encoded in the lower word, and the size of
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* any in or out parameters in the upper word. The high 3 bits of the
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* upper word are used to encode the in/out status of the parameter.
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*
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* 31 29 28 16 15 8 7 0
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* +---------------------------------------------------------------+
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* | I/O | Parameter Length | Command Group | Command |
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* +---------------------------------------------------------------+
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*/
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#define IOCPARM_SHIFT 13 /* number of bits for ioctl size */
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#define IOCPARM_MASK ((1 << IOCPARM_SHIFT) - 1) /* parameter length mask */
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@ -47,11 +52,12 @@
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#define IOCGROUP(x) (((x) >> 8) & 0xff)
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#define IOCPARM_MAX (1 << IOCPARM_SHIFT) /* max size of ioctl */
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#define IOC_VOID 0x20000000 /* no parameters */
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#define IOC_OUT 0x40000000 /* copy out parameters */
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#define IOC_IN 0x80000000 /* copy in parameters */
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#define IOC_INOUT (IOC_IN|IOC_OUT)
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#define IOC_DIRMASK (IOC_VOID|IOC_OUT|IOC_IN)
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#define IOC_VOID 0x20000000UL /* no parameters */
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#define IOC_OUT 0x40000000UL /* copy out parameters */
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#define IOC_IN 0x80000000UL /* copy in parameters */
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#define IOC_INOUT (IOC_IN|IOC_OUT)/* copy parameters in and out */
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#define IOC_DIRMASK (IOC_VOID|IOC_OUT|IOC_IN)/* mask for IN/OUT/VOID */
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#define _IOC(inout,group,num,len) ((unsigned long) \
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((inout) | (((len) & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
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