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191 lines
8.1 KiB
XML
191 lines
8.1 KiB
XML
<?xml version='1.0'?>
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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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SPDX-License-Identifier: LGPL-2.1+
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-->
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<refentry id="sd_bus_message_new_method_error"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_message_new_method_error</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_new_method_error</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_new_method_error</refname>
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<refname>sd_bus_message_new_method_errorf</refname>
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<refname>sd_bus_message_new_method_errno</refname>
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<refname>sd_bus_message_new_method_errnof</refname>
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<refpurpose>Create a an error reply for a method call</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_new_method_error</funcdef>
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<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
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<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
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<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int sd_bus_message_new_method_errorf</funcdef>
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<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
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<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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<paramdef>const char *<parameter>format</parameter></paramdef>
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<paramdef>…</paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int sd_bus_message_new_method_errno</funcdef>
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<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
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<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
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<paramdef>int <parameter>error</parameter></paramdef>
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<paramdef>const sd_bus_error *<parameter>p</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int sd_bus_message_new_method_errnof</funcdef>
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<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
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<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
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<paramdef>int <parameter>error</parameter></paramdef>
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<paramdef>const char *<parameter>format</parameter></paramdef>
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<paramdef>…</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>The <function>sd_bus_message_new_method_error()</function> function creates
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a new bus message object that is an error reply to the
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<parameter>call</parameter> message, and returns it in the
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<parameter>m</parameter> output parameter. The error information from error
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<parameter>e</parameter> is appended: the <parameter>name</parameter> field of
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<parameter>e</parameter> is used as the error identifier in the reply header (for
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example an error name such as
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<literal>org.freedesktop.DBus.Error.NotSupported</literal> or the equivalent
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symbolic <constant>SD_BUS_ERROR_NOT_SUPPORTED</constant>), and the
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<parameter>message</parameter> field is set as the human readable error message
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string if present. The error <parameter>e</parameter> must have the
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<parameter>name</parameter> field set, see
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<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para>The <function>sd_bus_message_new_method_errorf()</function> function
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creates an error reply similarly to
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<function>sd_bus_message_new_method_error()</function>, but instead of a ready
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error structure, it takes an error identifier string <parameter>name</parameter>,
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plus a <citerefentry
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project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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format string <parameter>format</parameter> and corresponding arguments. An error
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reply is sent with the error identifier <parameter>name</parameter> and the
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formatted string as the message. <parameter>name</parameter> and
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<parameter>format</parameter> must not be <constant>NULL</constant>.
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</para>
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<para>The <function>sd_bus_message_new_method_errno()</function> function creates
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an error reply similarly to
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<function>sd_bus_message_new_method_error()</function>, but in addition to the
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error structure <parameter>p</parameter>, it takes an
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<citerefentry><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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error value in parameter <parameter>error</parameter>. If the error
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<parameter>p</parameter> is set (see
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<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>),
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it is used in the reply. Otherwise, <parameter>error</parameter> is translated to
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an error identifier and used to create a new error structure using
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<citerefentry><refentrytitle>sd_bus_error_set_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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and that is used in the reply. (If <parameter>error</parameter> is zero, no error
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is actually set, and an error reply with no information is created.)</para>
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<para>The <function>sd_bus_message_new_method_errnof()</function> function
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creates an error reply similarly to
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<function>sd_bus_message_new_method_error()</function>. It takes an
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<citerefentry><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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error value in parameter <parameter>error</parameter>, plus a <citerefentry
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project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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format string <parameter>format</parameter> and corresponding arguments.
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<literal>%m</literal> may be used in the format string to refer to the error
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string corresponding to the specified errno code. The error message is initalized
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using the error identifier generated from <constant>error</constant> and the
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formatted string. (If <parameter>error</parameter> is zero, no error is actually
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set, and an error reply with no information is created.)</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>These functions return 0 if the error reply was successfully created, and a
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negative errno-style error code otherwise.</para>
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</refsect1>
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<refsect1 id='errors'>
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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>The call message <parameter>call</parameter> or the output
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parameter <parameter>m</parameter> are <constant>NULL</constant>.</para>
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<para>Message <parameter>call</parameter> is not a method call
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message.</para>
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<para>The error <parameter>error</parameter> parameter to
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<function>sd_bus_message_new_method_error</function> is not set, see
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<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</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>call</parameter> has been sealed.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOTCONN</constant></term>
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<listitem><para>The bus to which message <parameter>call</parameter> is
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attached is not connected.</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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</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>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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