diff options
Diffstat (limited to 'src/libsystemd/sd_bus_request_name.xml')
| -rw-r--r-- | src/libsystemd/sd_bus_request_name.xml | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/libsystemd/sd_bus_request_name.xml b/src/libsystemd/sd_bus_request_name.xml new file mode 100644 index 0000000000..f07ae09555 --- /dev/null +++ b/src/libsystemd/sd_bus_request_name.xml @@ -0,0 +1,213 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2013 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_bus_request_name"> + + <refentryinfo> + <title>sd_bus_request_name</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_request_name</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_request_name</refname> + <refname>sd_bus_release_name</refname> + <refpurpose>Request or release a well-known service name on a bus</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_bus_request_name</function></funcdef> + <paramdef>sd_bus *<parameter>bus</parameter></paramdef> + <paramdef>const char *<parameter>name</parameter></paramdef> + <paramdef>uint64_t <parameter>flags</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_release_name</function></funcdef> + <paramdef>sd_bus *<parameter>bus</parameter></paramdef> + <paramdef>const char *<parameter>name</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_request_name()</function> requests a + well-known service name on a bus. It takes a bus connection, a + valid bus name and a flags parameter. The flags parameter is a + combination of the following flags:</para> + + <variablelist> + <varlistentry> + <term><varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname></term> + + <listitem><para>After acquiring the name successfully, permit + other peers to take over the name when they try to acquire it + with the <varname>SD_BUS_NAME_REPLACE_EXISTING</varname> flag + set. If <varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname> is + not set on the original request, such a request by other peers + will be denied.</para></listitem> + </varlistentry> + + <varlistentry> + <term><varname>SD_BUS_NAME_REPLACE_EXISTING</varname></term> + + <listitem><para>Take over the name if it is already acquired + by another peer, and that other peer has permitted takeover by + setting <varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname> while + acquiring it.</para></listitem> + </varlistentry> + + <varlistentry> + <term><varname>SD_BUS_NAME_QUEUE</varname></term> + + <listitem><para>Queue the acquisition of the name when the + name is already taken.</para></listitem> + </varlistentry> + </variablelist> + + <para><function>sd_bus_release_name()</function> releases an + acquired well-known name. It takes a bus connection and a valid + bus name as parameters.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, these calls return 0 or a positive integer. On + failure, these calls return a negative errno-style error + code.</para> + + <para>If <varname>SD_BUS_NAME_QUEUE</varname> is specified, + <function>sd_bus_request_name()</function> will return 0 when the + name is already taken by another peer and the client has been + added to the queue for the name. In that case, the caller can + subscribe to <literal>NameOwnerChanged</literal> signals to be + notified when the name is successfully acquired. + <function>sd_bus_request_name()</function> returns > 0 when the + name has immediately been acquired successfully.</para> + </refsect1> + + <refsect1> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + <varlistentry> + <term><constant>-EALREADY</constant></term> + + <listitem><para>The caller already is the owner of the + specified name.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EEXIST</constant></term> + + <listitem><para>The name has already been acquired by a + different peer, and SD_BUS_NAME_REPLACE_EXISTING was not + specified or the other peer did not specify + SD_BUS_NAME_ALLOW_REPLACEMENT while acquiring the + name.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ESRCH</constant></term> + + <listitem><para>It was attempted to release a name that is + currently not registered on the bus.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EADDRINUSE</constant></term> + + <listitem><para>It was attempted to release a name that is + owned by a different peer on the bus.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>A specified parameter is invalid. This is also + generated when the requested name is a special service name + reserved by the D-Bus specification, or when the operation is + requested on a connection that does not refer to a + bus.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENOTCONN</constant></term> + + <listitem><para>The bus connection has been + disconnected.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ECHILD</constant></term> + + <listitem><para>The bus connection has been created in a + different process than the current one.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>The <function>sd_bus_acquire_name()</function> and + <function>sd_bus_release_name()</function> interfaces are + available as a shared library, which can be compiled and linked to + with the + <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |