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681eb9cf2b
In particular, use /lib/systemd instead of /usr/lib/systemd in distributions like Debian which still have not adopted a /usr merge setup. Use XML entities from man/custom-entities.ent to replace configured paths while doing XSLT processing of the original XML files. There was precedent of some files (such as systemd.generator.xml) which were already using this approach. This addresses most of the (manual) fixes from this patch: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/patches/Fix-paths-in-man-pages.patch?h=experimental-220 The idea of using generic XML entities was presented here: http://lists.freedesktop.org/archives/systemd-devel/2015-May/032240.html This patch solves almost all the issues, with the exception of: - Path to /bin/mount and /bin/umount. - Generic statements about preference of /lib over /etc. These will be handled separately by follow up patches. Tested: - With default configure settings, ran "make install" to two separate directories and compared the output to confirm they matched exactly. - Used a set of configure flags including $CONFFLAGS from Debian: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/rules Installed the tree and confirmed the paths use /lib/systemd instead of /usr/lib/systemd and that no other unexpected differences exist. - Confirmed that `make distcheck` still passes.
258 lines
9.3 KiB
XML
258 lines
9.3 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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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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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_message_append" conditional="ENABLE_KDBUS"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_message_append</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_message_append</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_message_append</refname>
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<refpurpose>Attach parts of message based on a format string</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 sd_bus_message_append</funcdef>
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<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
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<paramdef>const char *<parameter>types</parameter></paramdef>
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<paramdef>...</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>The <function>sd_bus_message_append</function> function appends
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a sequence of items to message <parameter>m</parameter>. The
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format string <parameter>types</parameter> describes the types of
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arguments that follow.</para>
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<para>The format string is composed of the elements shown in the
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table below. It contains zero or more single "complete types".
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Each complete type may be one of the basic types or a fully
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described container type. A container type may be a structure, a
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variant type code, an array with its element type, or a dictionary
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with its entry type. The format string is
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<constant>NUL</constant>-terminated.</para>
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<para>In case of a basic type, one argument of the corresponding
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type is expected.</para>
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<para>A structure is denoted by a sequence of complete types
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between <literal>(</literal> and <literal>)</literal>. This
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sequence cannot be empty — it must contain at least one type.
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Arguments corresponding to this nested sequence follow the same
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rules as if they were not nested.</para>
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<para>A variant is denoted by <literal>v</literal>. Corresponding
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arguments must include a format string denoting a complete type,
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and following that, arguments corresponding to the specified type.
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</para>
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<para>An array is denoted by <literal>a</literal> followed by a
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complete type. Corresponding arguments must include the size of
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the array, and then repeated this number of times, arguments
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corresponding to the nested type.</para>
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<para>A dictionary is an array of dictionary entries, denoted by
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<literal>a</literal> followed by a pair of complete types between
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<literal>{</literal> and <literal>}</literal>. The first of those
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types must be a basic type. Corresponding arguments must include
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the size of the dictionary, and then repeated this number of
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times, arguments corresponding to each of the two nested
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types.</para>
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<table>
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<title>Item format specifiers</title>
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<tgroup cols='4'>
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<xi:include href="sd_bus_message_append_basic.xml" xpointer="xpointer(//table[@id='format-specifiers'])//colspec" />
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<xi:include href="sd_bus_message_append_basic.xml" xpointer="xpointer(//table[@id='format-specifiers']//thead)" />
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<tbody>
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<xi:include href="sd_bus_message_append_basic.xml" xpointer="xpointer(//table[@id='format-specifiers']//tbody/*)" />
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<row>
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<entry><literal>a</literal></entry>
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<entry><constant>SD_BUS_TYPE_ARRAY</constant></entry>
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<entry>array</entry>
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<entry>determined by array type and size</entry>
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</row>
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<row>
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<entry><literal>v</literal></entry>
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<entry><constant>SD_BUS_TYPE_VARIANT</constant></entry>
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<entry>variant</entry>
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<entry>determined by the type argument</entry>
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</row>
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<row>
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<entry><literal>(</literal></entry>
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<entry><constant>SD_BUS_TYPE_STRUCT_BEGIN</constant></entry>
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<entry>array start</entry>
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<entry morerows="1">determined by the nested types</entry>
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</row>
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<row>
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<entry><literal>)</literal></entry>
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<entry><constant>SD_BUS_TYPE_STRUCT_END</constant></entry>
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<entry>array end</entry>
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</row>
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<row>
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<entry><literal>{</literal></entry>
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<entry><constant>SD_BUS_TYPE_DICT_ENTRY_BEGIN</constant></entry>
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<entry>dictionary entry start</entry>
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<entry morerows="1">determined by the nested types</entry>
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</row>
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<row>
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<entry><literal>}</literal></entry>
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<entry><constant>SD_BUS_TYPE_DICT_ENTRY_END</constant></entry>
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<entry>dictionary entry end</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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<title>Types string grammar</title>
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<programlisting>types ::= complete_type*
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complete_type ::= basic_type | variant | structure | array | dictionary
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basic_type ::= "y" | "n" | "q" | "u" | "i" | "x" | "t" | "d" |
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"b" | "h" |
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"s" | "o" | "g"
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variant ::= "v"
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structure ::= "(" complete_type+ ")"
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array ::= "a" complete_type
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dictionary ::= "a" "{" basic_type complete_type "}"
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</programlisting>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>Append a single basic type (the string <literal>a string</literal>):
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</para>
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<programlisting>sd_bus_message *m;
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...
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sd_bus_message_append(m, "s", "a string");</programlisting>
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<para>Append all types of integers:</para>
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<programlisting>uint8_t y = 1;
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int16_t n = 2;
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uint16_t q = 3;
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int32_t i = 4;
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uint32_t u = 5;
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int32_t x = 6;
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uint32_t t = 7;
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double d = 8.0;
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sd_bus_message_append(m, "ynqiuxtd", y, n, q, i, u, x, t, d);</programlisting>
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<para>Append a structure composed of string and a D-Bus path:</para>
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<programlisting>sd_bus_message_append(m, "(so)", "a string", "/a/path");
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</programlisting>
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<para>Append an array of UNIX file descriptors:</para>
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<programlisting>sd_bus_message_append(m, "ah", 3, STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO);
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</programlisting>
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<para>Append a variant, with the real type "g" (signature),
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and value "sdbusisgood":</para>
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<programlisting>sd_bus_message_append(m, "v", "g", "sdbusisgood");</programlisting>
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<para>Append a dictionary containing the mapping {1=>"a", 2=>"b", 3=>""}:
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</para>
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<programlisting>sd_bus_message_append(m, "a{is}", 3, 1, "a", 2, "b", 3, NULL);
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</programlisting>
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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, this call returns 0 or a positive
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integer. On failure, this call returns a negative
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errno-style error code.</para>
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</refsect1>
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<xi:include href="sd_bus_message_append_basic.xml" xpointer="errors" />
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<refsect1>
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<title>Notes</title>
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<para><function>sd_bus_open_user()</function> and other functions
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described here are available as a shared library, which can be
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compiled and linked to with the
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<constant>libsystemd-bus</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><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>ssh</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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