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 `fwd' port forwarder.
  11  *
  12  * `fwd' 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  * `fwd' 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 `fwd'; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 #include "fwd.h"
  28
  29 /*----- Main code ---------------------------------------------------------*/
  30
  31 /* --- @reffd_init@ --- *
  32  *
  33  * Arguments:   @int fd@ = file descriptor
  34  *
  35  * Returns:     Reference-counted file descriptor object.
  36  *
  37  * Use:         Creates a refcounted file descriptor.
  38  */
  39
  40 reffd *reffd_init(int fd)
  41 {
  42   reffd *r = CREATE(reffd);
  43   r->fd = fd;
  44   r->ref = 1;
  45   r->proc = 0;
  46   r->p = 0;
  47   return (r);
  48 }
  49
  50 /* --- @reffd_handler@ --- *
  51  *
  52  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  53  *              @void (*proc)(void *p)@ = procedure to call
  54  *              @void *p@
  55  *
  56  * Returns:     ---
  57  *
  58  * Use:         Sets the reference counted file descriptor to call @proc@
  59  *              when it is no longer required.
  60  */
  61
  62 void reffd_handler(reffd *r, void (*proc)(void *p), void *p)
  63 {
  64   r->proc = proc;
  65   r->p = p;
  66 }
  67
  68 /* --- @reffd_inc@ --- *
  69  *
  70  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Increments the reference count for a file descriptor.
  75  */
  76
  77 void reffd_inc(reffd *r) { REFFD_INC(r); }
  78
  79 /* --- @reffd_dec@ --- *
  80  *
  81  * Arguments:   @reffd *r@ = pointer to reference counted filehandle
  82  *
  83  * Returns:     ---
  84  *
  85  * Use:         Decrements the reference count for a file descriptor.
  86  */
  87
  88 void reffd_dec(reffd *r) { REFFD_DEC(r); }
  89
  90 /*----- That's all, folks -------------------------------------------------*/