resolv/gai_cancel.c

   1 /* Copyright (C) 2001-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <netdb.h>
  19 #include <pthread.h>
  20 #include <shlib-compat.h>
  21 #include <gai_misc.h>
  22
  23
  24 int
  25 __gai_cancel (struct gaicb *gaicbp)
  26 {
  27   int result = 0;
  28   int status;
  29
  30   /* Request the mutex.  */
  31   __pthread_mutex_lock (&__gai_requests_mutex);
  32
  33   /* Find the request among those queued but not yet running.  */
  34   status = __gai_remove_request (gaicbp);
  35   if (status == 0)
  36     result = EAI_CANCELED;
  37   else if (status > 0)
  38     result = EAI_NOTCANCELED;
  39   else
  40     result = EAI_ALLDONE;
  41
  42   /* Release the mutex.  */
  43   __pthread_mutex_unlock (&__gai_requests_mutex);
  44
  45   return result;
  46 }
  47 #if PTHREAD_IN_LIBC
  48 versioned_symbol (libc, __gai_cancel, gai_cancel, GLIBC_2_34);
  49
  50 # if OTHER_SHLIB_COMPAT (libanl, GLIBC_2_2_3, GLIBC_2_34)
  51 compat_symbol (libanl, __gai_cancel, gai_cancel, GLIBC_2_2_3);
  52 # endif
  53 #else /* !PTHREAD_IN_LIBC */
  54 strong_alias (__gai_cancel, gai_cancel)
  55 #endif /* !PTHREAD_IN_LIBC */