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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* Provide kernel hint to read ahead.
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Copyright (C) 2002-2015 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, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.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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ssize_t
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__readahead (int fd, off64_t offset, size_t count)
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{
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return INLINE_SYSCALL (readahead, 4, fd,
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__LONG_LONG_PAIR ((off_t) (offset >> 32),
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(off_t) (offset & 0xffffffff)),
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count);
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}
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#else
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ssize_t
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__readahead (int fd, off64_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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#endif
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weak_alias (__readahead, readahead)
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