land v0.9.1 on HEAD, in preparation for a 1.0.x branch

[fs/lustre-release.git] / lnet / include / cygwin-ioctl.h

diff --git a/lnet/include/cygwin-ioctl.h b/lnet/include/cygwin-ioctl.h
new file mode 100644 (file)
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--- /dev/null
+++ b/lnet/include/cygwin-ioctl.h
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+/* $Id: cygwin-ioctl.h,v 1.2 2003/12/03 03:14:43 phil Exp $
+ *
+ * linux/ioctl.h for Linux by H.H. Bergman.
+ */
+
+#ifndef _ASMI386_IOCTL_H
+#define _ASMI386_IOCTL_H
+
+/* ioctl command encoding: 32 bits total, command in lower 16 bits,
+ * size of the parameter structure in the lower 14 bits of the
+ * upper 16 bits.
+ * Encoding the size of the parameter structure in the ioctl request
+ * is useful for catching programs compiled with old versions
+ * and to avoid overwriting user space outside the user buffer area.
+ * The highest 2 bits are reserved for indicating the ``access mode''.
+ * NOTE: This limits the max parameter size to 16kB -1 !
+ */
+
+/*
+ * The following is for compatibility across the various Linux
+ * platforms.  The i386 ioctl numbering scheme doesn't really enforce
+ * a type field.  De facto, however, the top 8 bits of the lower 16
+ * bits are indeed used as a type field, so we might just as well make
+ * this explicit here.  Please be sure to use the decoding macros
+ * below from now on.
+ */
+#undef _IO
+#undef _IOR
+#undef _IOW
+#undef _IOC
+#undef IOC_IN
+#undef IOC_OUT
+
+#define _IOC_NRBITS    8
+#define _IOC_TYPEBITS  8
+#define _IOC_SIZEBITS  14
+#define _IOC_DIRBITS   2
+
+#define _IOC_NRMASK    ((1 << _IOC_NRBITS)-1)
+#define _IOC_TYPEMASK  ((1 << _IOC_TYPEBITS)-1)
+#define _IOC_SIZEMASK  ((1 << _IOC_SIZEBITS)-1)
+#define _IOC_DIRMASK   ((1 << _IOC_DIRBITS)-1)
+
+#define _IOC_NRSHIFT   0
+#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
+#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
+#define _IOC_DIRSHIFT  (_IOC_SIZESHIFT+_IOC_SIZEBITS)
+
+/*
+ * Direction bits.
+ */
+#define _IOC_NONE      0U
+#define _IOC_WRITE     1U
+#define _IOC_READ      2U
+
+#define _IOC(dir,type,nr,size) \
+       (((dir)  << _IOC_DIRSHIFT) | \
+        ((type) << _IOC_TYPESHIFT) | \
+        ((nr)   << _IOC_NRSHIFT) | \
+        ((size) << _IOC_SIZESHIFT))
+
+/* used to create numbers */
+#define _IO(type,nr)           _IOC(_IOC_NONE,(type),(nr),0)
+#define _IOR(type,nr,size)     _IOC(_IOC_READ,(type),(nr),sizeof(size))
+#define _IOW(type,nr,size)     _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
+#define _IOWR(type,nr,size)    _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
+
+/* used to decode ioctl numbers.. */
+#define _IOC_DIR(nr)           (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
+#define _IOC_TYPE(nr)          (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
+#define _IOC_NR(nr)            (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
+#define _IOC_SIZE(nr)          (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
+
+/* ...and for the drivers/sound files... */
+
+#define IOC_IN         (_IOC_WRITE << _IOC_DIRSHIFT)
+#define IOC_OUT                (_IOC_READ << _IOC_DIRSHIFT)
+#define IOC_INOUT      ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
+#define IOCSIZE_MASK   (_IOC_SIZEMASK << _IOC_SIZESHIFT)
+#define IOCSIZE_SHIFT  (_IOC_SIZESHIFT)
+
+#endif /* _ASMI386_IOCTL_H */