kc3-lang/gnulib/lib/close-hook.c

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• Hash : b2e2010c
  Author :
  Date : 2010-01-01T10:31:12
  

  update nearly all FSF copyright year lists to include 2010
  
  Use the same procedure as for 2009, outlined in
  http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/20081
  

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• lib/close-hook.c

• /* Hook for making the close() function extensible.
     Copyright (C) 2009, 2010 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2009.
  
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU Lesser General Public License as published
     by the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "close-hook.h"
  
  #include <stdlib.h>
  #include <unistd.h>
  
  #undef close
  
  
  /* Currently, this entire code is only needed for the handling of sockets
     on native Windows platforms.  */
  #if WINDOWS_SOCKETS
  
  /* The first and last link in the doubly linked list.
     Initially the list is empty.  */
  static struct close_hook anchor = { &anchor, &anchor, NULL };
  
  int
  execute_close_hooks (int fd, const struct close_hook *remaining_list)
  {
    if (remaining_list == &anchor)
      /* End of list reached.  */
      return close (fd);
    else
      return remaining_list->private_fn (fd, remaining_list->private_next);
  }
  
  int
  execute_all_close_hooks (int fd)
  {
    return execute_close_hooks (fd, anchor.private_next);
  }
  
  void
  register_close_hook (close_hook_fn hook, struct close_hook *link)
  {
    if (link->private_next == NULL && link->private_prev == NULL)
      {
        /* Add the link to the doubly linked list.  */
        link->private_next = anchor.private_next;
        link->private_prev = &anchor;
        link->private_fn = hook;
        anchor.private_next->private_prev = link;
        anchor.private_next = link;
      }
    else
      {
        /* The link is already in use.  */
        if (link->private_fn != hook)
          abort ();
      }
  }
  
  void
  unregister_close_hook (struct close_hook *link)
  {
    struct close_hook *next = link->private_next;
    struct close_hook *prev = link->private_prev;
  
    if (next != NULL && prev != NULL)
      {
        /* The link is in use.  Remove it from the doubly linked list.  */
        prev->private_next = next;
        next->private_prev = prev;
        /* Clear the link, to mark it unused.  */
        link->private_next = NULL;
        link->private_prev = NULL;
        link->private_fn = NULL;
      }
  }
  
  #endif
  

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