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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!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 2015 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_error_add_map">
-
- <refentryinfo>
- <title>sd_bus_error_add_map</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_error_add_map</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_bus_error_add_map</refname>
- <refname>sd_bus_error_map</refname>
- <refname>SD_BUS_ERROR_MAP</refname>
- <refname>SD_BUS_ERROR_END</refname>
-
- <refpurpose>Additional sd-dbus error mappings</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
-
- <funcsynopsisinfo>typedef struct {
- const char *name;
- int code;
- ...
-} sd_bus_error_map;</funcsynopsisinfo>
-
- </funcsynopsis>
-
- <para>
- <constant>SD_BUS_ERROR_MAP(<replaceable>name</replaceable>, <replaceable>code</replaceable>)</constant>
- </para>
- <para>
- <constant>SD_BUS_ERROR_MAP_END</constant>
- </para>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_error_add_map</function></funcdef>
- <paramdef>const sd_bus_map *<parameter>map</parameter></paramdef>
- </funcprototype>
-
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>The <function>sd_bus_error_add_map()</function> call may be
- used to register additional mappings for converting D-Bus errors
- to Linux <varname>errno</varname>-style errors. The mappings
- defined with this call are consulted by calls such as
- <citerefentry><refentrytitle>sd_bus_error_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- or
- <citerefentry><refentrytitle>sd_bus_error_get_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>. By
- default a number of generic, standardized mappings are known, as
- documented in
- <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Use
- this call to add further, application-specific mappings.</para>
-
- <para>The function takes a pointer to an array of
- <structname>sd_bus_error_map</structname> structures. A reference
- to the specified array is added to the lookup tables for error
- mappings. Note that the structure is not copied, it is hence
- essential that the array stays available and constant during the
- entire remaining runtime of the process.</para>
-
- <para>The mapping array should be put together with a series of
- <constant>SD_BUS_ERROR_MAP()</constant> macro invocations, that
- take a literal name string and a (positive)
- <varname>errno</varname>-style error number. The last entry of the
- array should be an invocation of the
- <constant>SD_BUS_ERROR_MAP_END</constant> macro. The array should not be
- put together without use of these two macros.</para>
-
- <para>Note that the call is idempotent: it is safe to invoke it
- multiple times with the parameter, which will only add the passed
- mapping array once.</para>
-
- <para>Note that the memory allocated by this call is not intended
- to be freed during the lifetime of the process. It should not be
- freed explicitly.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para><function>sd_bus_error_add_map()</function> returns a
- positive value when the new array was added to the lookup
- tables. It returns zero when the same array was already added
- before. On error, a negative <varname>errno</varname>-style error
- code is returned. See below for known error codes.</para>
- </refsect1>
-
- <refsect1>
- <title>Errors</title>
-
- <para>Returned errors may indicate the following problems:</para>
-
- <variablelist>
-
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
-
- <listitem><para>The specified mapping array is invalid.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ENOMEM</constant></term>
-
- <listitem><para>Memory allocation failed.</para></listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>The various error definitions described here 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_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>