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

   1 /* -*-c-*-
   2  *
   3  * $Id: endpt.h,v 1.3 2004/04/08 01:36:25 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 #ifndef ENDPT_H
  30 #define ENDPT_H
  31
  32 #ifdef __cplusplus
  33   extern "C" {
  34 #endif
  35
  36 /*----- Header files ------------------------------------------------------*/
  37
  38 #ifndef REFFD_H
  39 #  include "reffd.h"
  40 #endif
  41
  42 /*----- Data structures ---------------------------------------------------*/
  43
  44 /* --- Basic endpoint structure --- */
  45
  46 typedef struct endpt {
  47   struct endpt_ops *ops;                /* Pointer to operations table */
  48   struct endpt *other;                  /* Pointer to sibling endpoint */
  49   unsigned f;                           /* Various flags */
  50   struct tango *t;                      /* Private data structure */
  51   reffd *in, *out;                      /* File descriptors */
  52 } endpt;
  53
  54 /* --- Endpoint flags --- */
  55
  56 #define EPF_PENDING 1u                  /* Endpoint creation in progress */
  57 #define EPF_FILE 2u                     /* Endpoint smells like a file */
  58
  59 /* --- Endpoint operations table --- */
  60
  61 typedef struct endpt_ops {
  62
  63   /* --- @attach@ --- *
  64    *
  65    * Arguments: @endpt *e@ = pointer to endpoint to be attached
  66    *            @reffd *in, *out@ = input and output file descriptors
  67    *
  68    * Returns:   ---
  69    *
  70    * Use:       Instructs a non-file endpoint to attach itself to a pair of
  71    *            files.
  72    */
  73
  74   void (*attach)(endpt */*e*/, reffd */*in*/, reffd */*out*/);
  75
  76   /* --- @file@ --- *
  77    *
  78    * Arguments: @endpt *e@ = pointer to endpoint in question
  79    *            @endpt *f@ = pointer to a file endpoint
  80    *
  81    * Returns:   ---
  82    *
  83    * Use:       Informs a non-file endpoint of a file endpoint which will
  84    *            want to be closed when it's finished with.  At that time, the
  85    *            endpoint should arrange to have both itself and its partner
  86    *            closed.  If no file is registered, the endpoint manager will
  87    *            close both endpoints itself.
  88    */
  89
  90   void (*file)(endpt */*e*/, endpt */*f*/);
  91
  92   /* --- @wclose@ --- *
  93    *
  94    * Arguments: @endpt *e@ = endpoint to be partially closed
  95    *
  96    * Returns:   ---
  97    *
  98    * Use:       Announces that the endpoint will not be written to any more.
  99    */
 100
 101   void (*wclose)(endpt */*e*/);
 102
 103   /* --- @close@ --- *
 104    *
 105    * Arguments: @endpt *e@ = endpoint to be closed
 106    *
 107    * Returns:   ---
 108    *
 109    * Use:       Completely closes an endpoint.  The endpoint's data may be
 110    *            freed, although some endpoints may wish to delay freeing for
 111    *            some reason.
 112    */
 113
 114   void (*close)(endpt */*e*/);
 115
 116 } endpt_ops;
 117
 118 /*----- Functions provided ------------------------------------------------*/
 119
 120 /* --- @endpt_kill@ --- *
 121  *
 122  * Arguments:   @endpt *a@ = an endpoint
 123  *
 124  * Returns:     ---
 125  *
 126  * Use:         Kills an endpoint.  If the endpoint is joined to another, the
 127  *              other endpoint is also killed, as is the connection between
 128  *              them (and that's the tricky bit).
 129  */
 130
 131 extern void endpt_kill(endpt */*a*/);
 132
 133 /* --- @endpt_killall@ --- *
 134  *
 135  * Arguments:   ---
 136  *
 137  * Returns:     ---
 138  *
 139  * Use:         Destroys all current endpoint connections.  Used when
 140  *              shutting down.
 141  */
 142
 143 extern void endpt_killall(void);
 144
 145 /* --- @endpt_join@ --- *
 146  *
 147  * Arguments:   @endpt *a@ = pointer to first endpoint
 148  *              @endpt *b@ = pointer to second endpoint
 149  *
 150  * Returns:     ---
 151  *
 152  * Use:         Joins two endpoints together.
 153  */
 154
 155 extern void endpt_join(endpt */*a*/, endpt */*b*/);
 156
 157 /*----- That's all, folks -------------------------------------------------*/
 158
 159 #ifdef __cplusplus
 160   }
 161 #endif
 162
 163 #endif