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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="sd_bus_reply_method_error"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_reply_method_error</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_reply_method_error</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_reply_method_error</refname>
<refname>sd_bus_reply_method_errorf</refname>
<refname>sd_bus_reply_method_errno</refname>
<refname>sd_bus_reply_method_errnof</refname>
<refpurpose>Reply with an error to a method call</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int sd_bus_reply_method_error</funcdef>
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_reply_method_errorf</funcdef>
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
<paramdef>const char *<parameter>name</parameter></paramdef>
<paramdef>const char *<parameter>format</parameter></paramdef>
<paramdef>…</paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_reply_method_errno</funcdef>
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
<paramdef>int <parameter>error</parameter></paramdef>
<paramdef>const sd_bus_error *<parameter>p</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_reply_method_errnof</funcdef>
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
<paramdef>int <parameter>error</parameter></paramdef>
<paramdef>const char *<parameter>format</parameter></paramdef>
<paramdef>…</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The <function>sd_bus_reply_method_error()</function> function sends an
error reply to the <parameter>call</parameter> message. The error structure
<parameter>e</parameter> specifies the error to send, and is used as described in
<citerefentry><refentrytitle>sd_bus_message_new_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
If no reply is expected to <parameter>call</parameter>, this function returns
success without sending reply.</para>
<para>The <function>sd_bus_reply_method_errorf()</function> is to
<function>sd_bus_reply_method_error()</function> what
<function>sd_bus_message_new_method_errorf()</function> is to
<function>sd_bus_message_new_method_error()</function>.</para>
<para>The <function>sd_bus_reply_method_errno()</function> is to
<function>sd_bus_reply_method_error()</function> what
<function>sd_bus_message_new_method_errno()</function> is to
<function>sd_bus_message_new_method_error()</function>.</para>
<para>The <function>sd_bus_reply_method_errnof()</function> is to
<function>sd_bus_reply_method_error()</function> what
<function>sd_bus_message_new_method_errnof()</function> is to
<function>sd_bus_message_new_method_error()</function>.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>These functions return 0 if the error reply was successfully sent or if
none was expected, and a negative errno-style error code otherwise.</para>
</refsect1>
<refsect1 id='errors'>
<title>Errors</title>
<para>Returned errors may indicate the following problems:</para>
<variablelist>
<varlistentry>
<term><constant>-EINVAL</constant></term>
<listitem><para>The call message <parameter>call</parameter> is
<constant>NULL</constant>.</para>
<para>Message <parameter>call</parameter> is not a method call message.
</para>
<para>Message <parameter>call</parameter> is not attached to a bus.</para>
<para>The error <parameter>error</parameter> parameter to
<function>sd_bus_reply_method_error</function> is not set, see
<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>-EPERM</constant></term>
<listitem><para>Message <parameter>call</parameter> has been sealed.
</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOTCONN</constant></term>
<listitem><para>The bus to which message <parameter>call</parameter> is
attached is not connected.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOMEM</constant></term>
<listitem><para>Memory allocation failed.</para></listitem>
</varlistentry>
</variablelist>
<para>In addition, any error message returned by
<citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>1</manvolnum></citerefentry>
may be returned.</para>
</refsect1>
<xi:include href="libsystemd-pkgconfig.xml" />
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_message_new_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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