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b1de39dec8
Logically, this is better, because we're describing a subset of possible return values. Visually this also looks quite good because groff renders refsect2 much less prominently. Also rewrap things, add <constant> in various places, fix some typos.
140 lines
5.0 KiB
XML
140 lines
5.0 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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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="sd_bus_error_add_map"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_error_add_map</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_error_add_map</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_error_add_map</refname>
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<refname>sd_bus_error_map</refname>
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<refname>SD_BUS_ERROR_MAP</refname>
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<refname>SD_BUS_ERROR_END</refname>
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<refpurpose>Additional sd-dbus error mappings</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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<funcsynopsisinfo>typedef struct {
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const char *name;
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int code;
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…
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} sd_bus_error_map;</funcsynopsisinfo>
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</funcsynopsis>
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<para>
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<constant>SD_BUS_ERROR_MAP(<replaceable>name</replaceable>, <replaceable>code</replaceable>)</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_MAP_END</constant>
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</para>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_add_map</function></funcdef>
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<paramdef>const sd_bus_map *<parameter>map</parameter></paramdef>
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</funcprototype>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <function>sd_bus_error_add_map()</function> call may be
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used to register additional mappings for converting D-Bus errors
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to Linux <varname>errno</varname>-style errors. The mappings
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defined with this call are consulted by calls such as
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<citerefentry><refentrytitle>sd_bus_error_set</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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or
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<citerefentry><refentrytitle>sd_bus_error_get_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>. By
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default, a number of generic, standardized mappings are known, as
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documented in
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<citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Use
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this call to add further, application-specific mappings.</para>
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<para>The function takes a pointer to an array of
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<structname>sd_bus_error_map</structname> structures. A reference
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to the specified array is added to the lookup tables for error
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mappings. Note that the structure is not copied, and that it is hence
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essential that the array stays available and constant during the
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entire remaining runtime of the process.</para>
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<para>The mapping array should be put together with a series of
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<constant>SD_BUS_ERROR_MAP()</constant> macro invocations that
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take a literal name string and a (positive)
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<varname>errno</varname>-style error number. The last entry of the
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array should be an invocation of the
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<constant>SD_BUS_ERROR_MAP_END</constant> macro. The array should not be
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put together without use of these two macros.</para>
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<para>Note that the call is idempotent: it is safe to invoke it
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multiple times with the parameter, which will only add the passed
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mapping array once.</para>
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<para>Note that the memory allocated by this call is not intended
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to be freed during the lifetime of the process. It should not be
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freed explicitly.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>sd_bus_error_add_map()</function> returns a
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positive value when the new array was added to the lookup
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tables. It returns zero when the same array was already added
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before. On error, a negative <varname>errno</varname>-style error
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code is returned. See below for known error codes.</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>The specified mapping array is invalid.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></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>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_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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