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[glibc.git] / sysdeps / unix / sysv / linux / readahead.c
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1 /* Provide kernel hint to read ahead.
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <sys/types.h>
24 #include <sysdep.h>
25 #include <sys/syscall.h>
28 #ifdef __NR_readahead
30 ssize_t
31 __readahead (int fd, off64_t offset, size_t count)
33 return INLINE_SYSCALL (readahead, 4, fd, (off_t) (offset >> 32),
34 (off_t) (offset & 0xffffffff), count);
36 #else
37 ssize_t
38 __readahead (int fd, off64_t offset, size_t count)
40 __set_errno (ENOSYS);
41 return -1;
43 stub_warning (readahead)
45 # include <stub-tag.h>
46 #endif
48 weak_alias (__readahead, readahead)