mirror of
https://github.com/systemd/systemd.git
synced 2024-11-24 02:33:36 +08:00
146 lines
5.4 KiB
XML
146 lines
5.4 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="sd_hwdb_new" xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
<refentryinfo>
|
|
<title>sd_hwdb_new</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_hwdb_new</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_hwdb_new</refname>
|
|
<refname>sd_hwdb_new_from_path</refname>
|
|
<refname>sd_hwdb_ref</refname>
|
|
<refname>sd_hwdb_unref</refname>
|
|
|
|
<refpurpose>Create a new hwdb object and create or destroy references to it</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-hwdb.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_hwdb_new</function></funcdef>
|
|
<paramdef>sd_hwdb **<parameter>hwdb</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_hwdb_new_from_path</function></funcdef>
|
|
<paramdef>const char *<parameter>path</parameter></paramdef>
|
|
<paramdef>sd_hwdb **<parameter>hwdb</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>sd_hwdb* <function>sd_hwdb_ref</function></funcdef>
|
|
<paramdef>sd_hwdb *<parameter>hwdb</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>sd_hwdb* <function>sd_hwdb_unref</function></funcdef>
|
|
<paramdef>sd_hwdb *<parameter>hwdb</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_hwdb_new()</function> creates a new hwdb object to access the binary hwdb
|
|
database. Upon initialization, the file containing the binary representation of the hardware database is
|
|
located and opened. The new object is returned in <parameter>hwdb</parameter>.</para>
|
|
|
|
<para><function>sd_hwdb_new_from_path()</function> may be used to specify the path from which the binary
|
|
hardware database should be opened.</para>
|
|
|
|
<para>The <parameter>hwdb</parameter> object is reference counted. <function>sd_hwdb_ref()</function> and
|
|
<function>sd_hwdb_unref()</function> may be used to get a new reference or destroy an existing reference
|
|
to an object. The caller must dispose of the reference acquired with <function>sd_hwdb_new()</function>
|
|
by calling <function>sd_hwdb_unref()</function> when done with the object.</para>
|
|
|
|
<para>Use
|
|
<citerefentry><refentrytitle>sd_hwdb_seek</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_hwdb_get</refentrytitle><manvolnum>3</manvolnum></citerefentry>, and
|
|
<citerefentry><refentrytitle>sd_hwdb_enumerate</refentrytitle><manvolnum>3</manvolnum></citerefentry> to
|
|
access entries.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success, <function>sd_hwdb_new()</function> and <function>sd_hwdb_new_from_path()</function>
|
|
return a non-negative integer. On failure, a negative errno-style error code is returned.</para>
|
|
|
|
<para><function>sd_hwdb_ref()</function> always returns the argument.
|
|
</para>
|
|
|
|
<para><function>sd_hwdb_unref()</function> always returns <constant>NULL</constant>.
|
|
</para>
|
|
|
|
<refsect2>
|
|
<title>Errors</title>
|
|
|
|
<para>Returned errors may indicate the following problems:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>-ENOENT</constant></term>
|
|
|
|
<listitem><para>The binary hardware database file could not be located. See
|
|
<citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
for more information.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v246"/>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-EINVAL</constant></term>
|
|
|
|
<listitem><para>The located binary hardware database file is in an incompatible format.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v246"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-ENOMEM</constant></term>
|
|
|
|
<listitem><para>Memory allocation failed.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v246"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<refsect1>
|
|
<title>History</title>
|
|
<para><function>sd_hwdb_new()</function>,
|
|
<function>sd_hwdb_ref()</function>, and
|
|
<function>sd_hwdb_unref()</function> were added in version 246.</para>
|
|
<para><function>sd_hwdb_new_from_path()</function> was added in version 252.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|