cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / asm-generic / ioctl.h

diff --git a/i686-linux-gnu-4.7/usr/include/asm-generic/ioctl.h b/i686-linux-gnu-4.7/usr/include/asm-generic/ioctl.h
new file mode 100644 (file)
index 0000000..8cbb364
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/asm-generic/ioctl.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_GENERIC_IOCTL_H
+#define _ASM_GENERIC_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 generic 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.
+ */
+#define _IOC_NRBITS    8
+#define _IOC_TYPEBITS  8
+
+/*
+ * Let any architecture override either of the following before
+ * including this file.
+ */
+
+#ifndef _IOC_SIZEBITS
+# define _IOC_SIZEBITS 14
+#endif
+
+#ifndef _IOC_DIRBITS
+# define _IOC_DIRBITS  2
+#endif
+
+#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, which any architecture can choose to override
+ * before including this file.
+ *
+ * NOTE: _IOC_WRITE means userland is writing and kernel is
+ * reading. _IOC_READ means userland is reading and kernel is writing.
+ */
+
+#ifndef _IOC_NONE
+# define _IOC_NONE     0U
+#endif
+
+#ifndef _IOC_WRITE
+# define _IOC_WRITE    1U
+#endif
+
+#ifndef _IOC_READ
+# define _IOC_READ     2U
+#endif
+
+#define _IOC(dir,type,nr,size) \
+       (((dir)  << _IOC_DIRSHIFT) | \
+        ((type) << _IOC_TYPESHIFT) | \
+        ((nr)   << _IOC_NRSHIFT) | \
+        ((size) << _IOC_SIZESHIFT))
+
+#define _IOC_TYPECHECK(t) (sizeof(t))
+
+/*
+ * Used to create numbers.
+ *
+ * NOTE: _IOW means userland is writing and kernel is reading. _IOR
+ * means userland is reading and kernel is writing.
+ */
+#define _IO(type,nr)           _IOC(_IOC_NONE,(type),(nr),0)
+#define _IOR(type,nr,size)     _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOW(type,nr,size)     _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOWR(type,nr,size)    _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
+#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
+#define _IOWR_BAD(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 /* _ASM_GENERIC_IOCTL_H */