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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/* Provide kernel hint to read ahead.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#ifdef __NR_readahead
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extern int __syscall_readahead (int fd, off_t offset_hi, off_t offset_lo,
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size_t count);
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ssize_t
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__readahead (int fd, loff_t offset, size_t count)
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{
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return INLINE_SYSCALL (readahead, 4, fd, (off_t) (offset >> 32),
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(off_t) (offset & 0xffffffff), count);
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}
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#else
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ssize_t
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__readahead (int fd, loff_t offset, size_t count)
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{
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__set_errno (ENOSYS);
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return -1;
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}
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stub_warning (readahead)
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# include <stub-tag.h>
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#endif
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weak_alias (__readahead, readahead)
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