1 /* Tests for AIO in librt.
2 Copyright (C) 1998, 2000, 2002, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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.
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.
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
30 if (fcntl (fd
, F_SETFL
, fcntl (fd
, F_GETFL
) | O_DIRECT
) >= 0)
32 int pgsz
= sysconf (_SC_PAGESIZE
);
33 char *buf
= mmap (NULL
, 16 * pgsz
, PROT_READ
| PROT_WRITE
,
34 MAP_PRIVATE
| MAP_ANON
, -1, 0);
35 if (buf
!= MAP_FAILED
)
37 memset (buf
, 0, 16 * pgsz
);
38 for (int sz
= 256; sz
<= 16 * pgsz
; sz
*= 2)
39 if (write (fd
, buf
, sz
) > 0)
45 munmap (buf
, 16 * pgsz
);
48 fcntl (fd
, F_SETFL
, fcntl (fd
, F_GETFL
) & ~O_DIRECT
);