89 lines
2.5 KiB
XML
89 lines
2.5 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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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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Copyright © 2016 Julian Orth
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-->
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<refentry id="sd_bus_get_fd">
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<refentryinfo>
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<title>sd_bus_get_fd</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<firstname>Julian</firstname>
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<surname>Orth</surname>
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<email>ju.orth@gmail.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_get_fd</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_get_fd</refname>
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<refpurpose>Get the file descriptor connected to the message bus</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 <function>sd_bus_get_fd</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></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>
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<function>sd_bus_get_fd()</function> returns the file descriptor used to
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communicate with the message bus. This descriptor can be used with
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<citerefentry
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project='die-net'><refentrytitle>select</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry
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project='die-net'><refentrytitle>poll</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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or similar functions to wait for incoming messages.
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</para>
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<para>
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If the bus was created with the
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<citerefentry><refentrytitle>sd_bus_set_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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function, then the <parameter>input_fd</parameter> used in that call is
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returned.
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</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>
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Returns the file descriptor used for incoming messages from the message
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bus.
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</para>
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</refsect1>
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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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<citerefentry><refentrytitle>sd_bus_set_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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</para>
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</refsect1>
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</refentry>
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