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-.\" This manpage is Copyright (C) 2004, Michael Kerrisk
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2004-05-40 Created by Michael Kerrisk <mtk.manpages@gmail.com>
-.\" 2004-10-05 aeb, minor correction
-.\"
-.TH readahead 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-readahead \- initiate file readahead into page cache
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "             /* See feature_test_macros(7) */"
-.B #define _FILE_OFFSET_BITS 64
-.B #include <fcntl.h>
-.P
-.BI "ssize_t readahead(int " fd ", off_t " offset ", size_t " count );
-.fi
-.SH DESCRIPTION
-.BR readahead ()
-initiates readahead on a file so that subsequent reads from that file will
-be satisfied from the cache, and not block on disk I/O
-(assuming the readahead was initiated early enough and that other activity
-on the system did not in the meantime flush pages from the cache).
-.P
-The
-.I fd
-argument is a file descriptor identifying the file which is
-to be read.
-The
-.I offset
-argument specifies the starting point from which data is to be read
-and
-.I count
-specifies the number of bytes to be read.
-I/O is performed in whole pages, so that
-.I offset
-is effectively rounded down to a page boundary
-and bytes are read up to the next page boundary greater than or
-equal to
-.IR "(offset+count)" .
-.BR readahead ()
-does not read beyond the end of the file.
-The file offset of the open file description referred to by the file descriptor
-.I fd
-is left unchanged.
-.SH RETURN VALUE
-On success,
-.BR readahead ()
-returns 0; on failure, \-1 is returned, with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I fd
-is not a valid file descriptor or is not open for reading.
-.TP
-.B EINVAL
-.I fd
-does not refer to a file type to which
-.BR readahead ()
-can be applied.
-.SH VERSIONS
-On some 32-bit architectures,
-the calling signature for this system call differs,
-for the reasons described in
-.BR syscall (2).
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.4.13,
-glibc 2.3.
-.SH NOTES
-.B _FILE_OFFSET_BITS
-should be defined to be 64 in code that uses a pointer to
-.BR readahead ,
-if the code is intended to be portable
-to traditional 32-bit x86 and ARM platforms where
-.BR off_t 's
-width defaults to 32 bits.
-.SH BUGS
-.BR readahead ()
-attempts to schedule the reads in the background and return immediately.
-However, it may block while it reads the filesystem metadata needed
-to locate the requested blocks.
-This occurs frequently with ext[234] on large files
-using indirect blocks instead of extents,
-giving the appearance that the call blocks until the requested data has
-been read.
-.SH SEE ALSO
-.BR lseek (2),
-.BR madvise (2),
-.BR mmap (2),
-.BR posix_fadvise (2),
-.BR read (2)