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diff --git a/man/sd_bus_error_add_map.xml b/man/sd_bus_error_add_map.xml new file mode 100644 index 0000000..dbe05a1 --- /dev/null +++ b/man/sd_bus_error_add_map.xml @@ -0,0 +1,142 @@ +<?xml version='1.0'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + SPDX-License-Identifier: LGPL-2.1+ +--> + +<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> + + </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, 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> + </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> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <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> |