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https://github.com/systemd/systemd.git
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136 lines
4.7 KiB
XML
136 lines
4.7 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//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-or-later
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Copyright © 2016 Julian Orth
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-->
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<refentry id="sd_bus_set_fd" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_set_fd</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_set_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_set_fd</refname>
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<refpurpose>Set the file descriptors to use for bus communication</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_set_fd</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>int <parameter>input_fd</parameter></paramdef>
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<paramdef>int <parameter>output_fd</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><function>sd_bus_set_fd()</function> sets the file descriptors used to communicate by a bus
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connection object. Both <parameter>input_fd</parameter> and <parameter>output_fd</parameter> must be
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valid file descriptors, referring to stream-based file objects (e.g. a stream socket, a pair of pipes or
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FIFOs, or even a TTY device). <parameter>input_fd</parameter> must be readable, and
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<parameter>output_fd</parameter> must be writable. The same file descriptor may be used (and typically is
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used) as both the input and the output file descriptor. This function must be called before the bus
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connection is started via
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<citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<para>The bus connection object will take possession of the passed file descriptors and will close them
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automatically when it is freed. Use
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<citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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to turn off this behaviour.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, <function>sd_bus_set_fd()</function> returns a non-negative integer. On
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failure, it returns a negative errno-style error code.</para>
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<refsect2>
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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>An invalid bus object was passed.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ECHILD</constant></term>
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<listitem><para>The bus connection was allocated in a parent process and is being reused
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in a child process after <function>fork()</function>.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EBADF</constant></term>
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<listitem><para>An invalid file descriptor was passed to
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<function>sd_bus_set_fd()</function>.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOPKG</constant></term>
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<listitem><para>The bus cannot be resolved.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></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>The bus connection has already been started.</para>
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<xi:include href="version-info.xml" xpointer="v248"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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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>History</title>
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<para><function>sd_bus_set_fd()</function> was added in version 248.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_start</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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