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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
151 lines
6.1 KiB
XML
151 lines
6.1 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_bus_path_encode">
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<refentryinfo>
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<title>sd_bus_path_encode</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>A monkey with a typewriter</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_path_encode</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_path_encode</refname>
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<refname>sd_bus_path_decode</refname>
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<refpurpose>Convert an external identifier into an object path and back</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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<funcprototype>
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<funcdef>int <function>sd_bus_path_encode</function></funcdef>
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<paramdef>const char *<parameter>prefix</parameter></paramdef>
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<paramdef>const char *<parameter>external_id</parameter></paramdef>
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<paramdef>char **<parameter>ret_path</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_path_decode</function></funcdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>const char *<parameter>prefix</parameter></paramdef>
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<paramdef>char **<parameter>ret_external_id</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_path_encode()</function> and
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<function>sd_bus_path_decode()</function> convert external
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identifier strings into object paths and back. These functions are
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useful to map application-specific string identifiers of any kind
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into bus object paths in a simple, reversible and safe way.</para>
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<para><function>sd_bus_path_encode()</function> takes a bus path
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prefix and an external identifier string as arguments, plus a
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place to store the returned bus path string. The bus path prefix
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must be a valid bus path, starting with a slash
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<literal>/</literal>, and not ending in one. The external
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identifier string may be in any format, may be the empty string,
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and has no restrictions on the charset — however, it must
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always be <constant>NUL</constant>-terminated. The returned string
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will be the concatenation of the bus path prefix plus an escaped
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version of the external identifier string. This operation may be
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reversed with <function>sd_bus_decode()</function>. It is
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recommended to only use external identifiers that generally
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require little escaping to be turned into valid bus path
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identifiers (for example, by sticking to a 7-bit ASCII character
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set), in order to ensure the resulting bus path is still short and
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easily processed.</para>
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<para><function>sd_bus_path_decode()</function> reverses the
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operation of <function>sd_bus_path_encode()</function> and thus
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regenerates an external identifier string from a bus path. It
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takes a bus path and a prefix string, plus a place to store the
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returned external identifier string. If the bus path does not
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start with the specified prefix, 0 is returned and the returned
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string is set to <constant>NULL</constant>. Otherwise, the
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string following the prefix is unescaped and returned in the
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external identifier string.</para>
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<para>The escaping used will replace all characters which are
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invalid in a bus object path by <literal>_</literal>, followed by a
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hexadecimal value. As a special case, the empty string will be
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replaced by a lone <literal>_</literal>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, <function>sd_bus_path_encode()</function>
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returns positive or 0, and a valid bus path in the return
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argument. On success, <function>sd_bus_path_decode()</function>
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returns a positive value if the prefixed matched, or 0 if it
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did not. If the prefix matched, the external identifier is returned
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in the return parameter. If it did not match, NULL is returned in
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the return parameter. On failure, a negative errno-style error
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number is returned by either function. The returned strings must
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be
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>'d
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by the caller.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para><function>sd_bus_path_encode()</function> and
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<function>sd_bus_path_decode()</function> are available as a
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shared library, which can be compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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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 project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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