sysdeps/pthread/aio_fsync.c

   1 /* Synchronize I/O in given file descriptor.
   2    Copyright (C) 1997-2013 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    <http://www.gnu.org/licenses/>.  */
  19
  20
  21 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
  22    implementation of aio_fsync and aio_fsync64 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_fsync64 has no prototype.  */
  26 #define aio_fsync64 XXX
  27 #include <aio.h>
  28 /* And undo the hack.  */
  29 #undef aio_fsync64
  30 #include <errno.h>
  31 #include <fcntl.h>
  32
  33 #include <aio_misc.h>
  34
  35
  36 int
  37 aio_fsync (int op, struct aiocb *aiocbp)
  38 {
  39   int flags;
  40
  41   if (op != O_DSYNC && __builtin_expect (op != O_SYNC, 0))
  42     {
  43       __set_errno (EINVAL);
  44       return -1;
  45     }
  46
  47   flags = fcntl (aiocbp->aio_fildes, F_GETFL);
  48   if (__builtin_expect (flags == -1, 0)
  49       || __builtin_expect ((flags & O_ACCMODE) == O_RDONLY, 0))
  50     {
  51       __set_errno (EBADF);
  52       return -1;
  53     }
  54
  55   return (__aio_enqueue_request ((aiocb_union *) aiocbp,
  56                                  op == O_SYNC ? LIO_SYNC : LIO_DSYNC) == NULL
  57           ? -1 : 0);
  58 }
  59
  60 weak_alias (aio_fsync, aio_fsync64)