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5aded36978
It is annoying when we have dead links on fd.o. Add project='man-pages|die-net|archlinux' to <citerefentry>-ies. In generated html, add external links to http://man7.org/linux/man-pages/man, http://linux.die.net/man/, https://www.archlinux.org/. By default, pages in sections 2 and 4 go to man7, since Michael Kerrisk is the autorative source on kernel related stuff. The rest of links goes to linux.die.net, because they have the manpages. Except for the pacman stuff, since it seems to be only available from archlinux.org. Poor gummiboot gets no link, because gummitboot(8) ain't to be found on the net. According to common wisdom, that would mean that it does not exist. But I have seen Kay using it, so I know it does, and deserves to be found. Can somebody be nice and put it up somewhere?
229 lines
9.9 KiB
XML
229 lines
9.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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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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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_bus_request_name" conditional="ENABLE_KDBUS">
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<refentryinfo>
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<title>sd_bus_request_name</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</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_request_name</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_request_name</refname>
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<refname>sd_bus_release_name</refname>
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<refpurpose>Request or release a well-known name on a 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_request_name</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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<paramdef>uint64_t <parameter>flags</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_release_name</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>name</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_request_name()</function> requests
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a well-known name on a bus. It takes a bus connection,
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a valid bus name and a flags parameter. The flags
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parameter is a combination of the following
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flags:</para>
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<variablelist>
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<varlistentry>
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<term><varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname></term>
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<listitem><para>After acquiring the
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name successfully, permit other peers
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to take over the name when they try to
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acquire it with the
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<varname>SD_BUS_NAME_REPLACE_EXISTING</varname>
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flag set. If
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<varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname>
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is not set on the original request,
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such a request by other peers will be
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denied.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SD_BUS_NAME_REPLACE_EXISTING</varname></term>
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<listitem><para>Take over the name
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if it is already acquired by another
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peer, and that other peer has permitted
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takeover by setting
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<varname>SD_BUS_NAME_ALLOW_REPLACEMENT</varname>
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while acquiring it.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SD_BUS_NAME_QUEUE</varname></term>
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<listitem><para>Queue the acquisition
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of the name when the name is already
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taken.</para></listitem>
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</varlistentry>
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</variablelist>
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<para><function>sd_bus_release_name()</function> releases
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an acquired well-known name. It takes a bus connection
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and a valid bus name as parameters.</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, these calls return 0 or a positive
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integer. On failure, these calls return a negative
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errno-style error code.</para>
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<para>If <varname>SD_BUS_NAME_QUEUE</varname> is
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specified, <function>sd_bus_request_name()</function>
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will return 0 when the name is already taken by
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another peer and the client has been added to the
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queue for the name. In that case, the caller can
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subscribe to <literal>NameOwnerChanged</literal>
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signals to be notified when the name is successfully
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acquired. <function>sd_bus_request_name()</function>
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returns > 0 when the name has immediately been
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acquired successfully.</para>
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</refsect1>
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<refsect1>
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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><varname>-EALREADY</varname></term>
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<listitem><para>The caller already is
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the owner of the specified
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name.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-EEXIST</varname></term>
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<listitem><para>The name has already
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been acquired by a different peer, and
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SD_BUS_NAME_REPLACE_EXISTING was not
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specified or the other peer did not
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specify SD_BUS_NAME_ALLOW_REPLACEMENT
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while acquiring the
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name.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ESRCH</varname></term>
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<listitem><para>It was attempted to
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release a name that is currently not
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registered on the
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bus.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-EADDRINUSE</varname></term>
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<listitem><para>It was attempted to
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release a name that is owned by a
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different peer on the
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bus.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-EINVAL</varname></term>
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<listitem><para>A specified parameter
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is invalid.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ENOTCONN</varname></term>
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<listitem><para>The bus connection has
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been disconnected.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ECHILD</varname></term>
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<listitem><para>The bus connection has
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been created in a different process
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than the current one.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_bus_acquire_name()</function>
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and <function>sd_bus_release_name()</function>
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interfaces are available as a shared library, which can
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be compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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