mdw@git.distorted.org.uk Git - fwd/blob - endpt.h

   1 /* -*-c-*-
   2  *
   3  * $Id: endpt.h,v 1.1 1999/07/26 23:33:01 mdw Exp $
   4  *
   5  * Generic endpoint abstraction
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the `fw' port forwarder.
  13  *
  14  * `fw' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `fw' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `fw'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: endpt.h,v $
  32  * Revision 1.1  1999/07/26 23:33:01  mdw
  33  * Infrastructure for the new design.
  34  *
  35  */
  36
  37 #ifndef ENDPT_H
  38 #define ENDPT_H
  39
  40 #ifdef __cplusplus
  41   extern "C" {
  42 #endif
  43
  44 /*----- Header files ------------------------------------------------------*/
  45
  46 #ifndef REFFD_H
  47 #  include "reffd.h"
  48 #endif
  49
  50 /*----- Data structures ---------------------------------------------------*/
  51
  52 /* --- Basic endpoint structure --- */
  53
  54 typedef struct endpt {
  55   struct endpt_ops *ops;                /* Pointer to operations table */
  56   struct endpt *other;                  /* Pointer to sibling endpoint */
  57   unsigned f;                           /* Various flags */
  58   struct tango *t;                      /* Private data structure */
  59   reffd *in, *out;                      /* File descriptors */
  60 } endpt;
  61
  62 /* --- Endpoint flags --- */
  63
  64 #define EPF_PENDING 1u                  /* Endpoint creation in progress */
  65 #define EPF_FILE 2u                     /* Endpoint smells like a file */
  66
  67 /* --- Endpoint operations table --- */
  68
  69 typedef struct endpt_ops {
  70
  71   /* --- @attach@ --- *
  72    *
  73    * Arguments: @endpt *e@ = pointer to endpoint to be attached
  74    *            @reffd *in, *out@ = input and output file descriptors
  75    *
  76    * Returns:   ---
  77    *
  78    * Use:       Instructs a non-file endpoint to attach itself to a pair of
  79    *            files.
  80    */
  81
  82   void (*attach)(endpt */*e*/, reffd */*in*/, reffd */*out*/);
  83
  84   /* --- @wclose@ --- *
  85    *
  86    * Arguments: @endpt *e@ = endpoint to be partially closed
  87    *
  88    * Returns:   ---
  89    *
  90    * Use:       Announces that the endpoint will not be written to any more.
  91    */
  92
  93   void (*wclose)(endpt */*e*/);
  94
  95   /* --- @close@ --- *
  96    *
  97    * Arguments: @endpt *e@ = endpoint to be closed
  98    *
  99    * Returns:   ---
 100    *
 101    * Use:       Completely closes an endpoint.  The endpoint's data may be
 102    *            freed, although some endpoints may wish to delay freeing for
 103    *            some reason.
 104    */
 105
 106   void (*close)(endpt */*e*/);
 107
 108 } endpt_ops;
 109
 110 /*----- Functions provided ------------------------------------------------*/
 111
 112 /* --- @endpt_kill@ --- *
 113  *
 114  * Arguments:   @endpt *a@ = an endpoint
 115  *
 116  * Returns:     ---
 117  *
 118  * Use:         Kills an endpoint.  If the endpoint is joined to another, the
 119  *              other endpoint is also killed, as is the connection between
 120  *              them (and that's the tricky bit).
 121  */
 122
 123 extern void endpt_kill(endpt */*a*/);
 124
 125 /* --- @endpt_killall@ --- *
 126  *
 127  * Arguments:   ---
 128  *
 129  * Returns:     ---
 130  *
 131  * Use:         Destroys all current endpoint connections.  Used when
 132  *              shutting down.
 133  */
 134
 135 extern void endpt_killall(void);
 136
 137 /* --- @endpt_join@ --- *
 138  *
 139  * Arguments:   @endpt *a@ = pointer to first endpoint
 140  *              @endpt *b@ = pointer to second endpoint
 141  *
 142  * Returns:     ---
 143  *
 144  * Use:         Joins two endpoints together.
 145  */
 146
 147 extern void endpt_join(endpt */*a*/, endpt */*b*/);
 148
 149 /*----- That's all, folks -------------------------------------------------*/
 150
 151 #ifdef __cplusplus
 152   }
 153 #endif
 154
 155 #endif