rtkaio/sysdeps/unix/sysv/linux/kaio_return.c

   1 /* Return exit value of asynchronous I/O request.
   2    Copyright (C) 1997, 2002, 2003 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21
  22 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
  23    implementation of aio_return and aio_return64 are identical and so
  24    we want to avoid code duplication by using aliases.  But gcc sees
  25    the different parameter lists and prints a warning.  We define here
  26    a function so that aio_return64 has no prototype.  */
  27 #define aio_return64 XXX
  28 #include <aio.h>
  29 /* And undo the hack.  */
  30 #undef aio_return64
  31
  32 #include <kaio_misc.h>
  33
  34 #ifndef USE_KAIO
  35 #include <aio_return.c>
  36 #else
  37
  38 #include <errno.h>
  39
  40 ssize_t
  41 aio_return (aiocbp)
  42      struct aiocb *aiocbp;
  43 {
  44   if (aiocbp->__error_code == EINPROGRESS)
  45     __aio_read_one_event ();
  46   return aiocbp->__return_value;
  47 }
  48
  49 weak_alias (aio_return, aio_return64)
  50 #endif