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

   1 /* -*-c-*-
   2  *
   3  * $Id: reffd.c,v 1.2 2004/04/08 01:36:25 mdw Exp $
   4  *
   5  * Reference counted file descriptors
   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 /*----- Header files ------------------------------------------------------*/
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include <sys/types.h>
  36 #include <unistd.h>
  37
  38 #include <mLib/sub.h>
  39
  40 #include "reffd.h"
  41
  42 /*----- Main code ---------------------------------------------------------*/
  43
  44 /* --- @reffd_init@ --- *
  45  *
  46  * Arguments:   @int fd@ = file descriptor
  47  *
  48  * Returns:     Reference-counted file descriptor object.
  49  *
  50  * Use:         Creates a refcounted file descriptor.
  51  */
  52
  53 reffd *reffd_init(int fd)
  54 {
  55   reffd *r = CREATE(reffd);
  56   r->fd = fd;
  57   r->ref = 1;
  58   r->proc = 0;
  59   r->p = 0;
  60   return (r);
  61 }
  62
  63 /* --- @reffd_handler@ --- *
  64  *
  65  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  66  *              @void (*proc)(void *p)@ = procedure to call
  67  *              @void *p@
  68  *
  69  * Returns:     ---
  70  *
  71  * Use:         Sets the reference counted file descriptor to call @proc@
  72  *              when it is no longer required.
  73  */
  74
  75 void reffd_handler(reffd *r, void (*proc)(void *p), void *p)
  76 {
  77   r->proc = proc;
  78   r->p = p;
  79 }
  80
  81 /* --- @reffd_inc@ --- *
  82  *
  83  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  84  *
  85  * Returns:     ---
  86  *
  87  * Use:         Increments the reference count for a file descriptor.
  88  */
  89
  90 void reffd_inc(reffd *r) { REFFD_INC(r); }
  91
  92 /* --- @reffd_dec@ --- *
  93  *
  94  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  95  *
  96  * Returns:     ---
  97  *
  98  * Use:         Decrements the reference count for a file descriptor.
  99  */
 100
 101 void reffd_dec(reffd *r) { REFFD_DEC(r); }
 102
 103 /*----- That's all, folks -------------------------------------------------*/