man/sd_bus_set_method_call_timeout.xml - main - niceSOFT/systemd

man/sd_bus_set_method_call_timeout.xml
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Luca Boccassi
man: add thread-awareness note to sd_bus/sd_event manpages
02 июл 2026, 19:04
02 июл 2026, 19:04964f060
<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->

<refentry id="sd_bus_set_method_call_timeout" xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>sd_bus_set_method_call_timeout</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_set_method_call_timeout</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_set_method_call_timeout</refname>
    <refname>sd_bus_get_method_call_timeout</refname>

    <refpurpose>Set or query the default D-Bus method call timeout of a bus object</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>

      <funcprototype>
        <funcdef>int <function>sd_bus_set_method_call_timeout</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>uint64_t <parameter>usec</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>int <function>sd_bus_get_method_call_timeout</function></funcdef>
        <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
        <paramdef>uint64_t *<parameter>ret</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_set_method_call_timeout()</function> sets the default D-Bus method call
    timeout of <parameter>bus</parameter> to <parameter>usec</parameter> microseconds.</para>

    <para><function>sd_bus_get_method_call_timeout()</function> queries the default D-Bus method
    call timeout of <parameter>bus</parameter>. If no method call timeout was set using
    <function>sd_bus_set_method_call_timeout()</function>, the timeout is read from the
    <varname>$SYSTEMD_BUS_TIMEOUT</varname> environment variable. If this environment variable is
    unset or does not contain a valid timeout, the implementation falls back to a predefined method
    call timeout of 25 seconds. Note that <varname>$SYSTEMD_BUS_TIMEOUT</varname> is read once and
    cached so callers should not rely on being able to change the default method call timeout at
    runtime by changing the value of <varname>$SYSTEMD_BUS_TIMEOUT</varname>. Instead, call
    <function>sd_bus_set_method_call_timeout()</function> to change the default method call timeout.
    </para>
  </refsect1>

  <refsect1>
    <title>Return Value</title>

    <para>On success, these functions return a non-negative integer. On failure, they return 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 parameters <parameter>bus</parameter> or <parameter>ret</parameter>
          are <constant>NULL</constant>.</para>

          <xi:include href="version-info.xml" xpointer="v246"/></listitem>
        </varlistentry>

        <varlistentry>
          <term><constant>-ENOPKG</constant></term>

          <listitem><para>Bus object <parameter>bus</parameter> could not be resolved.</para>

          <xi:include href="version-info.xml" xpointer="v246"/>
          </listitem>
        </varlistentry>
      </variablelist>

    </refsect2>
  </refsect1>

  <xi:include href="libsystemd-notes.xml"/>

  <refsect1>
    <title>History</title>
    <para><function>sd_bus_set_method_call_timeout()</function> and
    <function>sd_bus_get_method_call_timeout()</function> were added in version 246.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>

    <para><simplelist type="inline">
      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd_bus_call</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
    </simplelist></para>
  </refsect1>

</refentry>