rt/aio_error.c

   1 /* Return error status of asynchronous I/O request.
   2    Copyright (C) 1997-2022 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_error and aio_error64 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_error64 has no prototype.  */
  25 #define aio_error64 XXX
  26 #include <aio.h>
  27 /* And undo the hack.  */
  28 #undef aio_error64
  29
  30 #include <aio_misc.h>
  31 #include <pthreadP.h>
  32 #include <shlib-compat.h>
  33
  34 int
  35 __aio_error (const struct aiocb *aiocbp)
  36 {
  37   int ret;
  38
  39   /* Acquire the mutex to make sure all operations for this request are
  40      complete.  */
  41   __pthread_mutex_lock (&__aio_requests_mutex);
  42   ret = aiocbp->__error_code;
  43   __pthread_mutex_unlock (&__aio_requests_mutex);
  44
  45   return ret;
  46 }
  47
  48 #if PTHREAD_IN_LIBC
  49 versioned_symbol (libc, __aio_error, aio_error, GLIBC_2_34);
  50 versioned_symbol (libc, __aio_error, aio_error64, GLIBC_2_34);
  51 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_34)
  52 compat_symbol (librt, __aio_error, aio_error, GLIBC_2_1);
  53 compat_symbol (librt, __aio_error, aio_error64, GLIBC_2_1);
  54 # endif
  55 #else /* !PTHREAD_IN_LIBC */
  56 strong_alias (__aio_error, aio_error)
  57 weak_alias (__aio_error, aio_error64)
  58 #endif /* !PTHREAD_IN_LIBC */