60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* minix/ioctl.h - Ioctl helper definitions. Author: Kees J. Bot
|
|
* 23 Nov 2002
|
|
*
|
|
* This file is included by every header file that defines ioctl codes.
|
|
*/
|
|
|
|
#ifndef _M_IOCTL_H
|
|
#define _M_IOCTL_H
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/types.h>
|
|
|
|
/* Ioctls have the command encoded in the low-order word, and the size
|
|
* of the parameter in the high-order word. The 3 high bits of the high-
|
|
* order word are used to encode the in/out/void status of the parameter.
|
|
*/
|
|
#define _IOCPARM_MASK 0x0FFF
|
|
#define _IOCPARM_MASK_BIG 0x0FFFFF
|
|
#define _IOC_VOID 0x20000000
|
|
#define _IOCTYPE_MASK 0xFFFF
|
|
#define _IOC_IN 0x40000000
|
|
#define _IOC_OUT 0x80000000
|
|
#define _IOC_INOUT (_IOC_IN | _IOC_OUT)
|
|
|
|
/* Flag indicating ioctl format with only one type field, and more bits
|
|
* for the size field (using mask _IOCPARM_MASK_BIG).
|
|
*/
|
|
#define _IOC_BIG 0x10000000
|
|
|
|
#define _IO(x,y) ((x << 8) | y | _IOC_VOID)
|
|
#define _IOR(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
|
|
_IOC_OUT)
|
|
#define _IOW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
|
|
_IOC_IN)
|
|
#define _IORW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
|
|
_IOC_INOUT)
|
|
|
|
#define _IOW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
|
|
| _IOC_IN | _IOC_BIG)
|
|
#define _IOR_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
|
|
| _IOC_OUT | _IOC_BIG)
|
|
#define _IORW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
|
|
| _IOC_INOUT | _IOC_BIG)
|
|
|
|
/* Decode an ioctl call. */
|
|
#define _MINIX_IOCTL_SIZE(i) (((i) >> 16) & _IOCPARM_MASK)
|
|
#define _MINIX_IOCTL_IOR(i) ((i) & _IOC_OUT)
|
|
#define _MINIX_IOCTL_IORW(i) ((i) & _IOC_INOUT)
|
|
#define _MINIX_IOCTL_IOW(i) ((i) & _IOC_IN)
|
|
|
|
/* Recognize and decode size of a 'big' ioctl call. */
|
|
#define _MINIX_IOCTL_BIG(i) ((i) & _IOC_BIG)
|
|
#define _MINIX_IOCTL_SIZE_BIG(i) (((i) >> 8) & _IOCPARM_MASK_BIG)
|
|
|
|
__BEGIN_DECLS
|
|
int ioctl(int _fd, int _request, void *_data);
|
|
__END_DECLS
|
|
|
|
#endif /* _M_IOCTL_H */
|