mirror of
https://github.com/systemd/systemd
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100 lines
3.7 KiB
XML
100 lines
3.7 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/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_bus_message_verify_type" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_message_verify_type</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_message_verify_type</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_message_verify_type</refname>
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<refpurpose>Check if the message has specified type at the current location</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int sd_bus_message_verify_type</funcdef>
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<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
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<paramdef>char <parameter>type</parameter></paramdef>
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<paramdef>const char* <parameter>contents</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_bus_message_verify_type()</function> checks if the complete type at the
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current location in the message <parameter>m</parameter> matches the specified
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<parameter>type</parameter> and <parameter>contents</parameter>. If non-zero, parameter
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<parameter>type</parameter> must be one of the types specified in
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<citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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If non-null, parameter <parameter>contents</parameter> must be a valid sequence of complete
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types. If both <parameter>type</parameter> and <parameter>contents</parameter> are specified
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<parameter>type</parameter> must be a container type.</para>
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<para>If <parameter>type</parameter> is specified, the type in the message must match. If
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<parameter>contents</parameter> is specified, the type in the message must be a container type
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with this signature.</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, this call returns true if the type matches and zero if not (the message
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<parameter>m</parameter> contains different data or the end of the message has been reached). On
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failure, it returns a negative errno-style error code.</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>-EINVAL</constant></term>
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<listitem><para><parameter>m</parameter> or both <parameter>type</parameter> and
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<parameter>contents</parameter> are <constant>NULL</constant>.</para>
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<para>Arguments do not satisfy other constraints listed above.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EPERM</constant></term>
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<listitem><para>Message <parameter>m</parameter> is not sealed.
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</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><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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