mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-23 17:34:00 +03:00
188 lines
8.2 KiB
XML
188 lines
8.2 KiB
XML
<?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-or-later -->
|
|
|
|
<refentry id="sd_bus_message_new_method_error"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_bus_message_new_method_error</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_bus_message_new_method_error</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_bus_message_new_method_error</refname>
|
|
<refname>sd_bus_message_new_method_errorf</refname>
|
|
<refname>sd_bus_message_new_method_errno</refname>
|
|
<refname>sd_bus_message_new_method_errnof</refname>
|
|
|
|
<refpurpose>Create an error reply for a method call</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int sd_bus_message_new_method_error</funcdef>
|
|
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
|
|
<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
|
|
<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int sd_bus_message_new_method_errorf</funcdef>
|
|
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
|
|
<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
|
|
<paramdef>const char *<parameter>name</parameter></paramdef>
|
|
<paramdef>const char *<parameter>format</parameter></paramdef>
|
|
<paramdef>…</paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int sd_bus_message_new_method_errno</funcdef>
|
|
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
|
|
<paramdef>sd_bus_message **<parameter>m</parameter></paramdef>
|
|
<paramdef>int <parameter>error</parameter></paramdef>
|
|
<paramdef>const sd_bus_error *<parameter>p</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int sd_bus_message_new_method_errnof</funcdef>
|
|
<paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
|
|
<paramdef>sd_bus_message **<parameter>m</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_message_new_method_error()</function> function creates
|
|
a new bus message object that is an error reply to the
|
|
<parameter>call</parameter> message, and returns it in the
|
|
<parameter>m</parameter> output parameter. The error information from error
|
|
<parameter>e</parameter> is appended: the <parameter>name</parameter> field of
|
|
<parameter>e</parameter> is used as the error identifier in the reply header (for
|
|
example an error name such as
|
|
<literal>org.freedesktop.DBus.Error.NotSupported</literal> or the equivalent
|
|
symbolic <constant>SD_BUS_ERROR_NOT_SUPPORTED</constant>), and the
|
|
<parameter>message</parameter> field is set as the human readable error message
|
|
string if present. The error <parameter>e</parameter> must have the
|
|
<parameter>name</parameter> field set, see
|
|
<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
|
|
</para>
|
|
|
|
<para>The <function>sd_bus_message_new_method_errorf()</function> function
|
|
creates an error reply similarly to
|
|
<function>sd_bus_message_new_method_error()</function>, but instead of a ready
|
|
error structure, it takes an error identifier string <parameter>name</parameter>,
|
|
plus a <citerefentry
|
|
project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
format string <parameter>format</parameter> and corresponding arguments. An error
|
|
reply is sent with the error identifier <parameter>name</parameter> and the
|
|
formatted string as the message. <parameter>name</parameter> and
|
|
<parameter>format</parameter> must not be <constant>NULL</constant>.
|
|
</para>
|
|
|
|
<para>The <function>sd_bus_message_new_method_errno()</function> function creates
|
|
an error reply similarly to
|
|
<function>sd_bus_message_new_method_error()</function>, but in addition to the
|
|
error structure <parameter>p</parameter>, it takes an
|
|
<citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
error value in parameter <parameter>error</parameter>. If the error
|
|
<parameter>p</parameter> is set (see
|
|
<citerefentry><refentrytitle>sd_bus_error_is_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>),
|
|
it is used in the reply. Otherwise, <parameter>error</parameter> is translated to
|
|
an error identifier and used to create a new error structure using
|
|
<citerefentry><refentrytitle>sd_bus_error_set_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
and that is used in the reply. (If <parameter>error</parameter> is zero, no error
|
|
is actually set, and an error reply with no information is created.)</para>
|
|
|
|
<para>The <function>sd_bus_message_new_method_errnof()</function> function
|
|
creates an error reply similarly to
|
|
<function>sd_bus_message_new_method_error()</function>. It takes an
|
|
<citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
error value in parameter <parameter>error</parameter>, plus a <citerefentry
|
|
project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
format string <parameter>format</parameter> and corresponding arguments.
|
|
<literal>%m</literal> may be used in the format string to refer to the error
|
|
string corresponding to the specified errno code. The error message is initialized
|
|
using the error identifier generated from <constant>error</constant> and the
|
|
formatted string. (If <parameter>error</parameter> is zero, no error is actually
|
|
set, and an error reply with no information is created.)</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>These functions return 0 if the error reply was successfully created, and a
|
|
negative errno-style error code otherwise.</para>
|
|
|
|
<refsect2 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> or the output
|
|
parameter <parameter>m</parameter> are <constant>NULL</constant>.</para>
|
|
|
|
<para>Message <parameter>call</parameter> is not a method call
|
|
message.</para>
|
|
|
|
<para>The error <parameter>e</parameter> parameter to
|
|
<function>sd_bus_message_new_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>
|
|
</refsect2>
|
|
</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>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|