systemd/man/sd_bus_reply_method_error.xml

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<!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_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_errorfv</refname>
    <refname>sd_bus_reply_method_errno</refname>
    <refname>sd_bus_reply_method_errnof</refname>
    <refname>sd_bus_reply_method_errnofv</refname>

    <refpurpose>Reply with an error to a D-Bus method call</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</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_errorfv</funcdef>
        <paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
        <paramdef>const char *<parameter>name</parameter></paramdef>
        <paramdef>const char *<parameter>format</parameter></paramdef>
        <paramdef>va_list <parameter>ap</parameter></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>

      <funcprototype>
        <funcdef>int sd_bus_reply_method_errnofv</funcdef>
        <paramdef>sd_bus_message *<parameter>call</parameter></paramdef>
        <paramdef>int <parameter>error</parameter></paramdef>
        <paramdef>const char *<parameter>format</parameter></paramdef>
        <paramdef>va_list <parameter>ap</parameter></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_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
    If no reply is expected to <parameter>call</parameter>, this function succeeds without sending a
    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>This function returns a non-negative integer if the error reply was successfully sent or
    if <parameter>call</parameter> does not expect a reply. On failure, it returns a negative
    errno-style error code.</para>

    <refsect2>
      <title>Errors</title>

      <para>Returned errors may indicate the following problems:</para>

      <variablelist>
        <varlistentry>
          <term><constant>-EINVAL</constant></term>

          <listitem><para>The input parameter <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 <parameter>e</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 returned by
      <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>1</manvolnum></citerefentry>
      may be returned.</para>
    </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>,
      <citerefentry><refentrytitle>sd_bus_message_new_method_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>