Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
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29 * @(#)ioccom.h 8.2 (Berkeley) 3/28/94
30 * $FreeBSD: src/sys/sys/ioccom.h,v 1.15 2004/04/07 04:19:49 imp Exp $
33 #ifndef _SYS_IOCCOM_H_
34 #define _SYS_IOCCOM_H_
37 * Ioctl's have the command encoded in the lower word, and the size of
38 * any in or out parameters in the upper word. The high 3 bits of the
39 * upper word are used to encode the in/out status of the parameter.
41 #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */
42 #define IOCPARM_LEN(x) (((x) >> 16) & IOCPARM_MASK)
43 #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << 16))
44 #define IOCGROUP(x) (((x) >> 8) & 0xff)
46 #define IOCPARM_MAX PAGE_SIZE /* max size of ioctl, mult. of PAGE_SIZE */
47 #define IOC_VOID 0x20000000 /* no parameters */
48 #define IOC_OUT 0x40000000 /* copy out parameters */
49 #define IOC_IN 0x80000000 /* copy in parameters */
50 #define IOC_INOUT (IOC_IN|IOC_OUT)
51 #define IOC_DIRMASK 0xe0000000 /* mask for IN/OUT/VOID */
53 #define _IOC(inout,group,num,len) \
54 ((unsigned long)(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
55 #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0)
56 #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t))
57 #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t))
58 /* this should be _IORW, but stdio got there first */
59 #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t))
63 #include <sys/cdefs.h>
66 IMPORT_C int ioctl(int, unsigned long, ...);
71 #endif /* !_SYS_IOCCOM_H_ */