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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | ||
5 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2014 Zbigniew Jędrzejewski-Szmek | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | --> | |
23 | ||
24 | <refentry id="sd_bus_message_append_string_memfd" conditional="ENABLE_KDBUS" | |
25 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
26 | ||
27 | <refentryinfo> | |
28 | <title>sd_bus_message_append_string_memfd</title> | |
29 | <productname>systemd</productname> | |
30 | ||
31 | <authorgroup> | |
32 | <author> | |
33 | <contrib>A monkey with a typewriter</contrib> | |
34 | <firstname>Zbigniew</firstname> | |
35 | <surname>Jędrzejewski-Szmek</surname> | |
36 | <email>zbyszek@in.waw.pl</email> | |
37 | </author> | |
38 | </authorgroup> | |
39 | </refentryinfo> | |
40 | ||
41 | <refmeta> | |
42 | <refentrytitle>sd_bus_message_append_string_memfd</refentrytitle> | |
43 | <manvolnum>3</manvolnum> | |
44 | </refmeta> | |
45 | ||
46 | <refnamediv> | |
47 | <refname>sd_bus_message_append_string_memfd</refname> | |
48 | <refname>sd_bus_message_append_string_iovec</refname> | |
49 | <refname>sd_bus_message_append_string_space</refname> | |
50 | ||
51 | <refpurpose>Attach a string to a message</refpurpose> | |
52 | </refnamediv> | |
53 | ||
54 | <refsynopsisdiv> | |
55 | <funcsynopsis> | |
56 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
57 | ||
58 | <funcprototype> | |
59 | <funcdef>int sd_bus_message_append_string_memfd</funcdef> | |
60 | <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> | |
61 | <paramdef>sd_memfd *<parameter>memfd</parameter></paramdef> | |
62 | </funcprototype> | |
63 | ||
64 | <funcprototype> | |
65 | <funcdef>int sd_bus_message_append_string_iovec</funcdef> | |
66 | <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> | |
67 | <paramdef>const struct iovec *<parameter>iov</parameter></paramdef> | |
68 | <paramdef>unsigned <parameter>n</parameter></paramdef> | |
69 | </funcprototype> | |
70 | ||
71 | <funcprototype> | |
72 | <funcdef>int sd_bus_message_append_string_space</funcdef> | |
73 | <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> | |
74 | <paramdef>size_t <parameter>size</parameter></paramdef> | |
75 | <paramdef>char **<parameter>s</parameter></paramdef> | |
76 | </funcprototype> | |
77 | </funcsynopsis> | |
78 | </refsynopsisdiv> | |
79 | ||
80 | <refsect1> | |
81 | <title>Description</title> | |
82 | ||
83 | <para>Functions | |
84 | <function>sd_bus_message_append_string_memfd</function> and | |
85 | <function>sd_bus_message_append_string_iovec</function> can be | |
86 | used to append a single string (item of type <literal>s</literal>) | |
87 | to message <parameter>m</parameter>.</para> | |
88 | ||
89 | <para>In case of | |
90 | <function>sd_bus_message_append_string_memfd</function> the | |
91 | contents of <parameter>memfd</parameter> are the string. They must | |
92 | satisfy the same constraints as described for the | |
93 | <literal>s</literal> type in | |
94 | <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> | |
95 | ||
96 | <para>In case of | |
97 | <function>sd_bus_message_append_string_iovec</function> the | |
98 | payload of <parameter>iov</parameter> is the string. It must | |
99 | satisfy the same constraints as described for the | |
100 | <literal>s</literal> type in | |
101 | <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> | |
102 | ||
103 | <para>Pointer <parameter>iov</parameter> must point to | |
104 | <parameter>n</parameter> <structname>struct iovec</structname> | |
105 | structures. Each structure may have the | |
106 | <structname>iov_base</structname> field set, in which case the | |
107 | memory pointed to will be copied into the message, or unset, in | |
108 | which case a block of spaces (ASCII 32) of length | |
109 | <structname>iov_len</structname> will be inserted. The | |
110 | memory pointed at by <parameter>iov</parameter> may be changed | |
111 | after this call.</para> | |
112 | ||
113 | <para>Function | |
114 | <function>sd_bus_message_append_string_space</function> appends | |
115 | space for a string to message <parameter>m</parameter>. If behaves | |
116 | similarly to <function>sd_bus_message_append_basic</function> with | |
117 | type <literal>s</literal>, but instead of copying a string into | |
dca348bc JE |
118 | the message, it returns a pointer to the destination area to |
119 | the caller in pointer <parameter>p</parameter>. Space for the string | |
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120 | of length <parameter>size</parameter> plus the terminating |
121 | <constant>NUL</constant> is allocated.</para> | |
122 | </refsect1> | |
123 | ||
124 | <refsect1> | |
125 | <title>Return Value</title> | |
126 | ||
127 | <para>On success, those calls return 0 or a positive integer. On | |
128 | failure, they returns a negative errno-style error code.</para> | |
129 | </refsect1> | |
130 | ||
131 | <xi:include href="sd_bus_message_append_basic.xml" xpointer="errors" /> | |
132 | ||
133 | <refsect1> | |
134 | <title>Notes</title> | |
135 | ||
136 | <para>Functions described here are available as a shared library, | |
137 | which can be compiled and linked to with the | |
138 | <constant>libsystemd</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
139 | file.</para> | |
140 | </refsect1> | |
141 | ||
142 | <refsect1> | |
143 | <title>See Also</title> | |
144 | ||
145 | <para> | |
146 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
147 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
148 | <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
149 | <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink> | |
150 | </para> | |
151 | </refsect1> | |
152 | ||
153 | </refentry> |