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https://github.com/systemd/systemd
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60f0ba7556
The existing sd_hwdb_new function always initializes the hwdb from the first successful hwdb.bin it finds from hwdb_bin_paths. This means there is currently no way to initialize a hwdb from an explicit path, which would be useful for systemd-hwdb query. Add sd_hwdb_new_from_path to allow a sd_hwdb to be initialized from a custom path outside of hwdb_bin_paths.
132 lines
4.8 KiB
XML
132 lines
4.8 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_hwdb_new" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_hwdb_new</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_hwdb_new</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_hwdb_new</refname>
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<refname>sd_hwdb_new_from_path</refname>
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<refname>sd_hwdb_ref</refname>
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<refname>sd_hwdb_unref</refname>
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<refpurpose>Create a new hwdb object and create or destroy references to it</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-hwdb.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_hwdb_new</function></funcdef>
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<paramdef>sd_hwdb **<parameter>hwdb</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_hwdb_new_from_path</function></funcdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>sd_hwdb **<parameter>hwdb</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_hwdb* <function>sd_hwdb_ref</function></funcdef>
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<paramdef>sd_hwdb *<parameter>hwdb</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_hwdb* <function>sd_hwdb_unref</function></funcdef>
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<paramdef>sd_hwdb *<parameter>hwdb</parameter></paramdef>
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</funcprototype>
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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><function>sd_hwdb_new()</function> creates a new hwdb object to access the binary hwdb
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database. Upon initialization, the file containing the binary representation of the hardware database is
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located and opened. The new object is returned in <parameter>hwdb</parameter>.</para>
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<para><function>sd_hwdb_new_from_path()</function> may be used to specify the path from which the binary
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hardware database should be opened.</para>
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<para>The <parameter>hwdb</parameter> object is reference counted. <function>sd_hwdb_ref()</function> and
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<function>sd_hwdb_unref()</function> may be used to get a new reference or destroy an existing reference
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to an object. The caller must dispose of the reference acquired with <function>sd_hwdb_new()</function>
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by calling <function>sd_hwdb_unref()</function> when done with the object.</para>
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<para>Use
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<citerefentry><refentrytitle>sd_hwdb_seek</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_hwdb_get</refentrytitle><manvolnum>3</manvolnum></citerefentry>, and
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<citerefentry><refentrytitle>sd_hwdb_enumerate</refentrytitle><manvolnum>3</manvolnum></citerefentry> to
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access entries.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, <function>sd_hwdb_new()</function> and <function>sd_hwdb_new_from_path()</function>
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return a non-negative integer. On failure, a negative errno-style error code is returned.</para>
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<para><function>sd_hwdb_ref()</function> always returns the argument.
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</para>
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<para><function>sd_hwdb_unref()</function> always returns <constant>NULL</constant>.
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</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ENOENT</constant></term>
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<listitem><para>The binary hardware database file could not be located. See
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<citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for more information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>The located binary hardware database file is in an incompatible format.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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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>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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