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-<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="sd-readahead" conditional='ENABLE_READAHEAD'>
-
- <refentryinfo>
- <title>sd-readahead</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd-readahead</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd-readahead</refname>
- <refpurpose>Reference implementation of APIs for
- controlling boot-time read-ahead</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include "sd-readahead.h"</funcsynopsisinfo>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>sd-readahead.c</filename> and
- <filename>sd-readahead.h</filename> provide a
- reference implementation for APIs for controlling boot-time
- read-ahead, as implemented by the read-ahead subsystem
- of the
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- init system.</para>
-
- <para>See
- <citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- for more information about the function
- implemented.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>This interface is provided by the reference
- implementation of APIs for controlling boot-time
- read-ahead and distributed with the systemd
- package. The algorithms it implements are simple, and
- can easily be reimplemented in daemons if it is
- important to support this interface without using the
- reference implementation. See the respective function
- man pages for details.</para>
-
- <para>In addition, for details about the algorithms,
- check the liberally licensed reference implementation
- sources:
- <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c"/>
- and <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h"/></para>
-
- <para>These APIs are implemented in the reference
- implementation's drop-in
- <filename>sd-readahead.c</filename> and
- <filename>sd-readahead.h</filename> files. It is
- recommended that applications consuming these APIs copy
- the implementation into their source tree, either
- verbatim or in excerpts. These interfaces are
- currently not available in a dynamic library.</para>
-
- <para>The functions provided by this interface become
- NOPs when -DDISABLE_SYSTEMD is set during
- compilation. In addition, if
- <filename>sd-readhead.c</filename> is compiled on
- non-Linux systems it becomes NOPs.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>