mdw@git.distorted.org.uk Git - fwd/blob - source.c

   1 /* -*-c-*-
   2  *
   3  * Standard routines for forwarding sources
   4  *
   5  * (c) 1999 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the `fw' port forwarder.
  11  *
  12  * `fw' is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * `fw' is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with `fw'; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include "source.h"
  34
  35 /*----- Static variables --------------------------------------------------*/
  36
  37 static source *sources = 0;
  38
  39 /*----- Main code ---------------------------------------------------------*/
  40
  41 /* --- @source_add@ --- *
  42  *
  43  * Arguments:   @source *s@ = pointer to a source
  44  *
  45  * Returns:     ---
  46  *
  47  * Use:         Adds a source to the master list.  Only do this for passive
  48  *              sources (e.g., listening sockets), not active sources (e.g.,
  49  *              executable programs).
  50  */
  51
  52 void source_add(source *s)
  53 {
  54   s->next = sources;
  55   s->prev = 0;
  56   if (sources)
  57     sources->prev = s;
  58   sources = s;
  59 }
  60
  61 /* --- @source_remove@ --- *
  62  *
  63  * Arguments:   @source *s@ = pointer to a source
  64  *
  65  * Returns:     ---
  66  *
  67  * Use:         Removes a source from the master list.
  68  */
  69
  70 void source_remove(source *s)
  71 {
  72   if (s->next)
  73     s->next->prev = s->prev;
  74   if (s->prev)
  75     s->prev->next = s->next;
  76   else
  77     sources = s->next;
  78 }
  79
  80 /* --- @source_killall@ --- *
  81  *
  82  * Arguments:   ---
  83  *
  84  * Returns:     ---
  85  *
  86  * Use:         Frees all sources.
  87  */
  88
  89 void source_killall(void)
  90 {
  91   source *s = sources;
  92   while (s) {
  93     source *ss = s;
  94     s = s->next;
  95     ss->ops->destroy(ss);
  96   }
  97   sources = 0;
  98 }
  99
 100 /*----- That's all, folks -------------------------------------------------*/