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glibc  2.9
aio_fsync.c
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00001 /* Synchronize I/O in given file descriptor.
00002    Copyright (C) 1997, 1999, 2002, 2005 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 
00022 /* We use an UGLY hack to prevent gcc from finding us cheating.  The
00023    implementation of aio_fsync and aio_fsync64 are identical and so
00024    we want to avoid code duplication by using aliases.  But gcc sees
00025    the different parameter lists and prints a warning.  We define here
00026    a function so that aio_fsync64 has no prototype.  */
00027 #define aio_fsync64 XXX
00028 #include <aio.h>
00029 /* And undo the hack.  */
00030 #undef aio_fsync64
00031 #include <errno.h>
00032 
00033 #include <aio_misc.h>
00034 
00035 
00036 int
00037 aio_fsync (int op, struct aiocb *aiocbp)
00038 {
00039   int flags;
00040 
00041   if (op != O_DSYNC && __builtin_expect (op != O_SYNC, 0))
00042     {
00043       __set_errno (EINVAL);
00044       return -1;
00045     }
00046 
00047   flags = fcntl (aiocbp->aio_fildes, F_GETFL);
00048   if (__builtin_expect (flags == -1, 0)
00049       || __builtin_expect ((flags & (O_RDWR | O_WRONLY)) == 0, 0))
00050     {
00051       __set_errno (EBADF);
00052       return -1;
00053     }
00054 
00055   return (__aio_enqueue_request ((aiocb_union *) aiocbp,
00056                              op == O_SYNC ? LIO_SYNC : LIO_DSYNC) == NULL
00057          ? -1 : 0);
00058 }
00059 
00060 weak_alias (aio_fsync, aio_fsync64)