resolv/gai_cancel.c

   1 /* Copyright (C) 2001-2017 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <netdb.h>
  20 #include <pthread.h>
  21
  22 #include <gai_misc.h>
  23
  24
  25 int
  26 gai_cancel (struct gaicb *gaicbp)
  27 {
  28   int result = 0;
  29   int status;
  30
  31   /* Request the mutex.  */
  32   pthread_mutex_lock (&__gai_requests_mutex);
  33
  34   /* Find the request among those queued but not yet running.  */
  35   status = __gai_remove_request (gaicbp);
  36   if (status == 0)
  37     result = EAI_CANCELED;
  38   else if (status > 0)
  39     result = EAI_NOTCANCELED;
  40   else
  41     result = EAI_ALLDONE;
  42
  43   /* Release the mutex.  */
  44   pthread_mutex_unlock (&__gai_requests_mutex);
  45
  46   return result;
  47 }