rt/aio_error.c

   1 /* Return error status of asynchronous I/O request.
   2    Copyright (C) 1997-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20
  21 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
  22    implementation of aio_error and aio_error64 are identical and so
  23    we want to avoid code duplication by using aliases.  But gcc sees
  24    the different parameter lists and prints a warning.  We define here
  25    a function so that aio_error64 has no prototype.  */
  26 #define aio_error64 XXX
  27 #include <aio.h>
  28 /* And undo the hack.  */
  29 #undef aio_error64
  30
  31 #include <aio_misc.h>
  32 #include <pthreadP.h>
  33 #include <shlib-compat.h>
  34
  35 int
  36 __aio_error (const struct aiocb *aiocbp)
  37 {
  38   int ret;
  39
  40   /* Acquire the mutex to make sure all operations for this request are
  41      complete.  */
  42   __pthread_mutex_lock (&__aio_requests_mutex);
  43   ret = aiocbp->__error_code;
  44   __pthread_mutex_unlock (&__aio_requests_mutex);
  45
  46   return ret;
  47 }
  48
  49 #if PTHREAD_IN_LIBC
  50 versioned_symbol (libc, __aio_error, aio_error, GLIBC_2_34);
  51 versioned_symbol (libc, __aio_error, aio_error64, GLIBC_2_34);
  52 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_34)
  53 compat_symbol (librt, __aio_error, aio_error, GLIBC_2_1);
  54 compat_symbol (librt, __aio_error, aio_error64, GLIBC_2_1);
  55 # endif
  56 #else /* !PTHREAD_IN_LIBC */
  57 strong_alias (__aio_error, aio_error)
  58 weak_alias (__aio_error, aio_error64)
  59 #endif /* !PTHREAD_IN_LIBC */