src/util/vice.h

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #ifndef AFS_VICE_H
  11 #define AFS_VICE_H 1
  12
  13 #include <sys/types.h>
  14 #if !defined(AFS_NT40_ENV)
  15 # if (!defined(AFS_FBSD80_ENV) && !defined(AFS_LINUX26_ENV)) || !defined(KERNEL) || defined(UKERNEL)
  16 #  include <sys/ioctl.h>
  17 # endif
  18 #endif /* AFS_NT40_ENV */
  19 #if (defined(__sun) && defined(__SVR4)) || defined(AFS_DFBSD_ENV) || defined(AFS_USR_DFBSD_ENV)
  20 # include <sys/ioccom.h>
  21 #endif
  22
  23 /*
  24  * Structures used to pass data into AFS ioctls.  The buffer pointers may be
  25  * null, or the counts may be 0 if there are no input or output parameters.
  26  */
  27
  28 #if defined(KERNEL)
  29 /* A fixed size, whether the kernel uses the ILP32 or LP64 data models. */
  30 struct ViceIoctl32 {
  31     unsigned int in, out;       /* Data to be transferred in, or out */
  32     short in_size;              /* Size of input buffer <= 2K */
  33     short out_size;             /* Maximum size of output buffer, <= 2K */
  34 };
  35 #endif
  36
  37 /* Windows uses a different structure layout, defined in sys/pioctl_nt.h. */
  38 #ifndef AFS_NT40_ENV
  39 struct ViceIoctl {
  40     caddr_t in, out;            /* Data to be transferred in, or out */
  41     short in_size;              /* Size of input buffer <= 2K */
  42     short out_size;             /* Maximum size of output buffer, <= 2K */
  43 };
  44 #endif
  45
  46 /*
  47  * The structure argument to _IOW() is used to add a structure size component
  48  * to the _IOW() value, to help the kernel code identify how big a structure
  49  * the calling process is passing into a system call.
  50  *
  51  * In user space, struct ViceIoctl32 and struct ViceIoctl are the same except
  52  * on Digital Unix, where user space code is compiled in 64-bit mode.
  53  *
  54  * So, in kernel space, regardless whether it is compiled in 32-bit mode or
  55  * 64-bit mode, the kernel code can use the struct ViceIoctl32 version of
  56  * _IOW() to check the size of user space arguments -- except on Digital Unix
  57  * (or Linux on Alpha, since it's compatible with Digital Unix).  We don't
  58  * care about other 64-bit Linux versions since they don't check this length.
  59  */
  60 #if defined(KERNEL) && !defined(__alpha__)
  61 #define _VICEIOCTL(id) ((unsigned int) _IOW('V', id, struct ViceIoctl32))
  62 #define _VICEIOCTL2(dev, id) ((unsigned int) _IOW(dev, id, struct ViceIoctl32))
  63 #else
  64 #define _VICEIOCTL(id) ((unsigned int) _IOW('V', id, struct ViceIoctl))
  65 #define _VICEIOCTL2(dev, id) ((unsigned int) _IOW(dev, id, struct ViceIoctl))
  66 #endif
  67 #define _CVICEIOCTL(id) _VICEIOCTL2('C', id)
  68 #define _OVICEIOCTL(id) _VICEIOCTL2('O', id)
  69
  70 /*
  71  * Use these macros to define up to 256 vice ioctls in each space.  These
  72  * ioctls all potentially have in/out parameters, depending on the values in
  73  * the ViceIoctl structure.  This structure is passed into the kernel by the
  74  * normal ioctl parameter passing mechanism.
  75  *
  76  * See <http://grand.central.org/numbers/pioctls.html> for the definition of
  77  * the namespaces.
  78  */
  79
  80 #endif /* AFS_VICE_H */