man: fully document sd-bus' error APIs

[@zonque: Some minor nits fixed as pointed out by @ronnychevalier,
 dropped class='sd-bus-errors' to fix python logic]

2 files changed, 482 insertions, 0 deletions

diff --git a/man/sd-bus-errors.xml b/man/sd-bus-errors.xml
new file mode 100644
index 000000000..d6bbd7fbb
--- /dev/null
+++ b/man/sd-bus-errors.xml
@@ -0,0 +1,309 @@
+<?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-errors">
+
+  <refentryinfo>
+    <title>sd-bus-errors</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-errors</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd-bus-errors</refname>
+    <refname>SD_BUS_ERROR_FAILED</refname>
+    <refname>SD_BUS_ERROR_NO_MEMORY</refname>
+    <refname>SD_BUS_ERROR_SERVICE_UNKNOWN</refname>
+    <refname>SD_BUS_ERROR_NAME_HAS_NO_OWNER</refname>
+    <refname>SD_BUS_ERROR_NO_REPLY</refname>
+    <refname>SD_BUS_ERROR_IO_ERROR</refname>
+    <refname>SD_BUS_ERROR_BAD_ADDRESS</refname>
+    <refname>SD_BUS_ERROR_NOT_SUPPORTED</refname>
+    <refname>SD_BUS_ERROR_LIMITS_EXCEEDED</refname>
+    <refname>SD_BUS_ERROR_ACCESS_DENIED</refname>
+    <refname>SD_BUS_ERROR_AUTH_FAILED</refname>
+    <refname>SD_BUS_ERROR_NO_SERVER</refname>
+    <refname>SD_BUS_ERROR_TIMEOUT</refname>
+    <refname>SD_BUS_ERROR_NO_NETWORK</refname>
+    <refname>SD_BUS_ERROR_ADDRESS_IN_USE</refname>
+    <refname>SD_BUS_ERROR_DISCONNECTED</refname>
+    <refname>SD_BUS_ERROR_INVALID_ARGS</refname>
+    <refname>SD_BUS_ERROR_FILE_NOT_FOUND</refname>
+    <refname>SD_BUS_ERROR_FILE_EXISTS</refname>
+    <refname>SD_BUS_ERROR_UNKNOWN_METHOD</refname>
+    <refname>SD_BUS_ERROR_UNKNOWN_OBJECT</refname>
+    <refname>SD_BUS_ERROR_UNKNOWN_INTERFACE</refname>
+    <refname>SD_BUS_ERROR_UNKNOWN_PROPERTY</refname>
+    <refname>SD_BUS_ERROR_PROPERTY_READ_ONLY</refname>
+    <refname>SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN</refname>
+    <refname>SD_BUS_ERROR_INVALID_SIGNATURE</refname>
+    <refname>SD_BUS_ERROR_INCONSISTENT_MESSAGE</refname>
+    <refname>SD_BUS_ERROR_MATCH_RULE_NOT_FOUND</refname>
+    <refname>SD_BUS_ERROR_MATCH_RULE_INVALID</refname>
+    <refname>SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED</refname>
+
+    <refpurpose>Standard D-Bus error names</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+<funcsynopsisinfo>#define SD_BUS_ERROR_FAILED                     "org.freedesktop.DBus.Error.Failed"
+#define SD_BUS_ERROR_NO_MEMORY                  "org.freedesktop.DBus.Error.NoMemory"
+#define SD_BUS_ERROR_SERVICE_UNKNOWN            "org.freedesktop.DBus.Error.ServiceUnknown"
+#define SD_BUS_ERROR_NAME_HAS_NO_OWNER          "org.freedesktop.DBus.Error.NameHasNoOwner"
+#define SD_BUS_ERROR_NO_REPLY                   "org.freedesktop.DBus.Error.NoReply"
+#define SD_BUS_ERROR_IO_ERROR                   "org.freedesktop.DBus.Error.IOError"
+#define SD_BUS_ERROR_BAD_ADDRESS                "org.freedesktop.DBus.Error.BadAddress"
+#define SD_BUS_ERROR_NOT_SUPPORTED              "org.freedesktop.DBus.Error.NotSupported"
+#define SD_BUS_ERROR_LIMITS_EXCEEDED            "org.freedesktop.DBus.Error.LimitsExceeded"
+#define SD_BUS_ERROR_ACCESS_DENIED              "org.freedesktop.DBus.Error.AccessDenied"
+#define SD_BUS_ERROR_AUTH_FAILED                "org.freedesktop.DBus.Error.AuthFailed"
+#define SD_BUS_ERROR_NO_SERVER                  "org.freedesktop.DBus.Error.NoServer"
+#define SD_BUS_ERROR_TIMEOUT                    "org.freedesktop.DBus.Error.Timeout"
+#define SD_BUS_ERROR_NO_NETWORK                 "org.freedesktop.DBus.Error.NoNetwork"
+#define SD_BUS_ERROR_ADDRESS_IN_USE             "org.freedesktop.DBus.Error.AddressInUse"
+#define SD_BUS_ERROR_DISCONNECTED               "org.freedesktop.DBus.Error.Disconnected"
+#define SD_BUS_ERROR_INVALID_ARGS               "org.freedesktop.DBus.Error.InvalidArgs"
+#define SD_BUS_ERROR_FILE_NOT_FOUND             "org.freedesktop.DBus.Error.FileNotFound"
+#define SD_BUS_ERROR_FILE_EXISTS                "org.freedesktop.DBus.Error.FileExists"
+#define SD_BUS_ERROR_UNKNOWN_METHOD             "org.freedesktop.DBus.Error.UnknownMethod"
+#define SD_BUS_ERROR_UNKNOWN_OBJECT             "org.freedesktop.DBus.Error.UnknownObject"
+#define SD_BUS_ERROR_UNKNOWN_INTERFACE          "org.freedesktop.DBus.Error.UnknownInterface"
+#define SD_BUS_ERROR_UNKNOWN_PROPERTY           "org.freedesktop.DBus.Error.UnknownProperty"
+#define SD_BUS_ERROR_PROPERTY_READ_ONLY         "org.freedesktop.DBus.Error.PropertyReadOnly"
+#define SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN    "org.freedesktop.DBus.Error.UnixProcessIdUnknown"
+#define SD_BUS_ERROR_INVALID_SIGNATURE          "org.freedesktop.DBus.Error.InvalidSignature"
+#define SD_BUS_ERROR_INCONSISTENT_MESSAGE       "org.freedesktop.DBus.Error.InconsistentMessage"
+#define SD_BUS_ERROR_MATCH_RULE_NOT_FOUND       "org.freedesktop.DBus.Error.MatchRuleNotFound"
+#define SD_BUS_ERROR_MATCH_RULE_INVALID         "org.freedesktop.DBus.Error.MatchRuleInvalid"
+#define SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED \
+                                                "org.freedesktop.DBus.Error.InteractiveAuthorizationRequired"</funcsynopsisinfo>
+
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>In addition to the error names user programs define, D-Bus
+    knows a number of generic, standardized error names, that are
+    listed below.</para>
+
+    <para>In addition to this list, in sd-bus the special error
+    namespace <literal>System.Error.</literal> is used to map
+    arbitrary Linux system errors (as defined by <citerefentry
+    project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>)
+    to D-Bus errors and back. For example, the error
+    <constant>EUCLEAN</constant> is mapped to
+    <literal>System.Error.EUCLEAN</literal> and back.</para>
+
+    <variablelist>
+
+      <varlistentry>
+         <term><varname>SD_BUS_ERROR_FAILED</varname></term>
+         <listitem><para>A generic error indication. See the error
+         message for further details. This error name should be
+         avoided, in favour of a more expressive error
+         name.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NO_MEMORY</varname></term>
+        <listitem><para>A memory allocation failed, and the requested
+        operation could not be completed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_SERVICE_UNKNOWN</varname></term>
+        <listitem><para>The contacted bus service is unknown and
+        cannot be activated.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NAME_HAS_NO_OWNER</varname></term>
+        <listitem><para>The specified bus service name currently has
+        no owner.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NO_REPLY</varname></term>
+        <listitem><para>A message did not receive a reply. This error
+        is usually generated after a timeout.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_IO_ERROR</varname></term>
+        <listitem><para>Generic input/output error, for example when
+        accessing a socket or other IO context.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_BAD_ADDRESS</varname></term>
+        <listitem><para>The specified D-Bus bus address string is
+        malformed.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NOT_SUPPORTED</varname></term>
+        <listitem><para>The requested operation is not supported on
+        the local system.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_LIMITS_EXCEEDED</varname></term>
+        <listitem><para>Some limited resource has been
+        exhausted.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_ACCESS_DENIED</varname></term>
+        <listitem><para>Access to a resource has bee denied, due to security restrictions.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_AUTH_FAILED</varname></term>
+        <listitem><para>Authentication did not complete successfully.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NO_SERVER</varname></term>
+        <listitem><para>Unable to connect to the specified server.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_TIMEOUT</varname></term>
+        <listitem><para>An operation timed out. Note that method calls
+        which timeout generate a
+        <varname>SD_BUS_ERROR_NO_REPLY</varname>.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_NO_NETWORK</varname></term>
+        <listitem><para>No network available to execute requested network operation on.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_ADDRESS_IN_USE</varname></term>
+        <listitem><para>The specified network address is already being listened on.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_DISCONNECTED</varname></term>
+        <listitem><para>The connection has been terminated.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_INVALID_ARGS</varname></term>
+        <listitem><para>One or more invalid arguments have been passed.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_FILE_NOT_FOUND</varname></term>
+        <listitem><para>The requested file could not be found.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_FILE_EXISTS</varname></term>
+        <listitem><para>The requested file exists already.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_UNKNOWN_METHOD</varname></term>
+        <listitem><para>The requested method does not exist in the selected interface.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_UNKNOWN_OBJECT</varname></term>
+        <listitem><para>The requested object does not exist in the selected service.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_UNKNOWN_INTERFACE</varname></term>
+        <listitem><para>The requested interface does not exist on the selected object.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_UNKNOWN_PROPERTY</varname></term>
+        <listitem><para>The requested property does not exist in the selected interface.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_PROPERTY_READ_ONLY</varname></term>
+        <listitem><para>A write operation was requested on a read-only property.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN</varname></term>
+        <listitem><para>The requested PID is not known.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_INVALID_SIGNATURE</varname></term>
+        <listitem><para>The specified message signature is not
+        valid.</para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_INCONSISTENT_MESSAGE</varname></term>
+        <listitem><para>The passed message does not validate
+        correctly.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_MATCH_RULE_NOT_FOUND</varname></term>
+        <listitem><para>The specified match rule does not exist.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_MATCH_RULE_INVALID</varname></term>
+        <listitem><para>The specified match rule is invalid.</para></listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><varname>SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED</varname></term>
+        <listitem><para>Access to the requested operation is not
+        permitted, however, it might be available after interactive
+        authentication. This is usually returned by method calls
+        supporting a framework for additional interactive
+        authorization, when interactive authorization was not enabled
+        with the
+        <citerefentry><refentrytitle>sd_bus_message_set_allow_interactive_authorization</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+        for the method call message.</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_message_set_allow_interactive_authorization</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry project='die-net'><refentrytitle>strerror</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>
diff --git a/man/sd_bus_error_add_map.xml b/man/sd_bus_error_add_map.xml
new file mode 100644
index 000000000..3fca63be4
--- /dev/null
+++ b/man/sd_bus_error_add_map.xml
@@ -0,0 +1,173 @@
+<?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>