hurd/hurd/ioctl.h

   1 /* User-registered handlers for specific `ioctl' requests.
   2 Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _HURD_IOCTL_H
  21 #define _HURD_IOCTL_H   1
  22
  23 #define __need___va_list
  24 #include <stdarg.h>
  25 #include <ioctls.h>
  26
  27
  28 /* Type of handler function, called like ioctl to do its entire job.  */
  29 typedef int (*ioctl_handler_t) (int fd, int request, void *arg);
  30
  31 /* Structure that records an ioctl handler.  */
  32 struct ioctl_handler
  33   {
  34     /* Range of handled _IOC_NOTYPE (REQUEST) values.  */
  35     int first_request, last_request;
  36
  37     /* Handler function, called like ioctl to do its entire job.  */
  38     ioctl_handler_t handler;
  39
  40     struct ioctl_handler *next; /* Next handler.  */
  41   };
  42
  43
  44 /* Register HANDLER to handle ioctls with REQUEST values between
  45    FIRST_REQUEST and LAST_REQUEST inclusive.  Returns zero if successful.
  46    Return nonzero and sets `errno' for an error.  */
  47
  48 extern int hurd_register_ioctl_handler (int first_request, int last_request,
  49                                         ioctl_handler_t handler);
  50
  51
  52 /* Define a library-internal handler for ioctl commands between FIRST and
  53    LAST inclusive.  The last element gratuitously references HANDLER to
  54    avoid `defined but not used' warnings.  */
  55
  56 #define _HURD_HANDLE_IOCTLS(handler, first, last)                             \
  57   static const struct ioctl_handler handler##_ioctl_handler                   \
  58         __attribute__ ((__unused__)) =                                        \
  59     { _IOC_NOTYPE (first), _IOC_NOTYPE (last),                                \
  60         (int (*) (int, int, void *)) (handler), NULL };                       \
  61   text_set_element (_hurd_ioctl_handler_lists, ##handler##_ioctl_handler)
  62
  63 /* Define a library-internal handler for a single ioctl command.  */
  64
  65 #define _HURD_HANDLE_IOCTL(handler, ioctl) \
  66   _HURD_HANDLE_IOCTLS (handler, (ioctl), (ioctl))
  67
  68
  69 /* Lookup the handler for the given ioctl request.  */
  70
  71 ioctl_handler_t _hurd_lookup_ioctl_handler (int request);
  72
  73
  74 #endif  /* hurd/ioctl.h */