mirror of
https://github.com/systemd/systemd.git
synced 2024-11-23 18:23:32 +08:00
140 lines
5.3 KiB
XML
140 lines
5.3 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="sd_bus_error_add_map"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_bus_error_add_map</title>
|
|
<productname>systemd</productname>
|
|
</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 <systemd/sd-bus.h></funcsynopsisinfo>
|
|
|
|
<funcsynopsisinfo>typedef struct {
|
|
const char *name;
|
|
int code;
|
|
…
|
|
} sd_bus_error_map;</funcsynopsisinfo>
|
|
|
|
<funcsynopsisinfo><constant>SD_BUS_ERROR_MAP(<replaceable>name</replaceable>, <replaceable>code</replaceable>)</constant></funcsynopsisinfo>
|
|
|
|
<funcsynopsisinfo><constant>SD_BUS_ERROR_MAP_END</constant></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_error_add_map</function></funcdef>
|
|
<paramdef>const sd_bus_error_map *<parameter>map</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</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, and that 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>
|
|
|
|
<refsect2>
|
|
<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>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<refsect1>
|
|
<title>History</title>
|
|
<para><function>sd_bus_error_add_map()</function> was added in version 221.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>sd_bus_error</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
<member><citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
<member><citerefentry project='man-pages'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|