rt/aio_return.c

   1 /* Return exit value of asynchronous I/O request.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19
  20 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
  21    implementation of aio_return and aio_return64 are identical and so
  22    we want to avoid code duplication by using aliases.  But gcc sees
  23    the different parameter lists and prints a warning.  We define here
  24    a function so that aio_return64 has no prototype.  */
  25 #define aio_return64 XXX
  26 #include <aio.h>
  27 /* And undo the hack.  */
  28 #undef aio_return64
  29
  30 #include <shlib-compat.h>
  31
  32 ssize_t
  33 __aio_return (struct aiocb *aiocbp)
  34 {
  35   return aiocbp->__return_value;
  36 }
  37
  38 #if PTHREAD_IN_LIBC
  39 versioned_symbol (libc, __aio_return, aio_return, GLIBC_2_34);
  40 versioned_symbol (libc, __aio_return, aio_return64, GLIBC_2_34);
  41 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_34)
  42 compat_symbol (librt, __aio_return, aio_return, GLIBC_2_1);
  43 compat_symbol (librt, __aio_return, aio_return64, GLIBC_2_1);
  44 # endif
  45 #else /* !PTHREAD_IN_LIBC */
  46 strong_alias (__aio_return, aio_return)
  47 weak_alias (__aio_return, aio_return64)
  48 #endif