resolv/gai_cancel.c

   1 /* Copyright (C) 2001, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <netdb.h>
  21 #include <pthread.h>
  22
  23 #include <gai_misc.h>
  24
  25
  26 int
  27 gai_cancel (struct gaicb *gaicbp)
  28 {
  29   int result = 0;
  30   int status;
  31
  32   /* Request the mutex.  */
  33   pthread_mutex_lock (&__gai_requests_mutex);
  34
  35   /* Find the request among those queued but not yet running.  */
  36   status = __gai_remove_request (gaicbp);
  37   if (status == 0)
  38     result = EAI_CANCELED;
  39   else if (status > 0)
  40     result = EAI_NOTCANCELED;
  41   else
  42     result = EAI_ALLDONE;
  43
  44   /* Release the mutex.  */
  45   pthread_mutex_unlock (&__gai_requests_mutex);
  46
  47   return result;
  48 }