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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
118 lines
4.9 KiB
XML
118 lines
4.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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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 License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd-daemon">
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<refentryinfo>
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<title>sd-readahead</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd-readahead</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd-readahead</refname>
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<refpurpose>Reference implementation of APIs for
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controlling boot-time read-ahead</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include "sd-readahead.h"</funcsynopsisinfo>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>sd-readahead.c</filename> and
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<filename>sd-readahead.h</filename> provide a
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reference implementation for APIs for controlling boot-time
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read-ahead, as implemented by the read-ahead subsystem
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of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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init system.</para>
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<para>See
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<citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for more information about the function
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implemented.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>This interface is provided by the reference
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implementation of APIs for controlling boot-time
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read-ahead and distributed with the systemd
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package. The algorithms it implements are simple, and
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can easily be reimplemented in daemons if it is
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important to support this interface without using the
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reference implementation. See the respective function
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man pages for details.</para>
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<para>In addition, for details about the algorithms
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check the liberally licensed reference implementation
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sources:
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<ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c"/>
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resp. <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h"/></para>
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<para>These APIs are implemented in the reference
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implementation's drop-in
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<filename>sd-readahead.c</filename> and
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<filename>sd-readahead.h</filename> files. It is
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recommended that applications consuming these APIs copy
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the implementation into their source tree, either
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verbatim or in excerpts. These interfaces are
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currently not available in a dynamic library.</para>
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<para>The functions provided by this interface become
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NOPs when -DDISABLE_SYSTEMD is set during
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compilation. In addition, if
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<filename>sd-readhead.c</filename> is compiled on
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non-Linux systems it becomes NOPs.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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