rt/aio_read.c

   1 /* Asynchronous read.
   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 #include <bits/wordsize.h>
  20 #if __WORDSIZE == 64
  21 # define aio_read64 XXX
  22 # include <aio.h>
  23 /* And undo the hack.  */
  24 # undef aio_read64
  25 #else
  26 # include <aio.h>
  27 #endif
  28
  29 #include <aio_misc.h>
  30 #include <shlib-compat.h>
  31
  32 int
  33 __aio_read (struct aiocb *aiocbp)
  34 {
  35   return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ) == NULL
  36           ? -1 : 0);
  37 }
  38
  39 #if PTHREAD_IN_LIBC
  40 versioned_symbol (libc, __aio_read, aio_read, GLIBC_2_34);
  41 # if __WORDSIZE == 64
  42 versioned_symbol (libc, __aio_read, aio_read64, GLIBC_2_34);
  43 # endif
  44 # if OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_34)
  45 compat_symbol (librt, __aio_read, aio_read, GLIBC_2_1);
  46 #  if __WORDSIZE == 64
  47 compat_symbol (librt, __aio_read, aio_read64, GLIBC_2_1);
  48 #  endif
  49 # endif
  50 #else /* !PTHREAD_IN_LIBC */
  51 strong_alias (__aio_read, aio_read)
  52 # if __WORDSIZE == 64
  53 weak_alias (__aio_read, aio_read64)
  54 #endif
  55 #endif  /* !PTHREAD_IN_LIBC */