81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
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/**
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* @file sys/ioccom.h
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* @brief Definitions & maros common to ioctl
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*/
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#ifndef _SYS_IOCCOM_H
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#define _SYS_IOCCOM_H
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/**
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* @defgroup IOCTL_common sys/ioccom.h
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* @brief Definitions & maros common to ioctl()
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* @ingroup OpenBeOS_POSIX
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* @ingroup IOCTL
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* Ioctl values passed as the command (2nd) variable have the
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* command encoded in the lower word and the size of any parameters
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* in the upper word (in or out).
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* The high 3 bits are used to encode whether it's in or out.
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* Due to this you can't just give an ioctl value, you need to encode
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* it using macros described in
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* @ref IOCTL_macros
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* @{
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*/
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/** @defgroup IOCTL_parm ioctl() parameter definitions
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* @ingroup IOCTL_common
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* @{
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*/
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/** @def IOC_VOID */
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#define IOC_VOID (ulong)0x20000000
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/** @def IOC_OUT ioctl expects data (output) */
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#define IOC_OUT (ulong)0x40000000
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/** @def IOC_IN ioctl passes a value in */
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#define IOC_IN (ulong)0x80000000
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/** @def IOC_INOUT ioctl passes data in and out */
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#define IOC_INOUT (IOC_IN|IOC_OUT)
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/** @def IOC_DIRMASK */
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#define IOC_DIRMASK (ulong)0xe0000000
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/** @} */
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/**
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* @defgroup IOCTL_macros IOCTL macros
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* These should be used to define the values passed in as cmd to
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* ioctl()
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* @ingroup IOCTL_common
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* @{
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*/
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/** @def IOCPARM_MASK mask used to for following macros */
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#define IOCPARM_MASK 0x1fff
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/** @def IOCPARM_LEN(x) length of the data passed as param */
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#define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
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/** @def IOCBASECMD(x) the base command encoded in the ioctl value */
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#define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
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/** @def IOCGROUP(x) which group of ioctl() commands does this belong to? */
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#define IOCGROUP(x) (((x) >> 8) & 0xff)
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/** @def IOCPARM_MAX Maximum size of parameter that can be passed (20 bytes) */
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#define IOCPARM_MAX 20
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/**
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* @defgroup IOCTL_createmacros macro's to create ioctl() values
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* @brief these macro's should be used to create new ioctl() values
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* @ingroup IOCTL_common
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* @{
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*/
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/** @def _IOC(inout, group, num , len) create a new ioctl */
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#define _IOC(inout, group, num, len) \
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(inout | ((len & IOCPARM_MASK)<<16) | ((group) << 8) | (num))
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/** @def _IO(g,n) create a new void ioctl for group g, number n */
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#define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
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/** @def _IOR(g,n,t) create a ioctl() that reads a value of type t*/
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#define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
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/** @def _IOW(g,n,t) ioctl() that writes value of type t, group g, number n */
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#define _IOW(g,n,t) _IOC(IOC_IN , (g), (n), sizeof(t))
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/** @def _IOWR(g,n,t) ioctl() that reads/writes value of type t
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* @note this isn't _IORW as this causes name conflicts on some systems */
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#define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
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/** @} */
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/** @} */
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#endif /* _SYS_IOCCOM_H */
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