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

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