1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
<?xml version='1.0'?> <!--*-nxml-*-->
<!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 2014 Zbigniew Jędrzejewski-Szmek
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_message_append_string_memfd" conditional="ENABLE_KDBUS"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_message_append_string_memfd</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>A monkey with a typewriter</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_message_append_string_memfd</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_message_append_string_memfd</refname>
<refname>sd_bus_message_append_string_iovec</refname>
<refname>sd_bus_message_append_string_space</refname>
<refpurpose>Attach a string to a message</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int sd_bus_message_append_string_memfd</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>sd_memfd *<parameter>memfd</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_message_append_string_iovec</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>const struct iovec *<parameter>iov</parameter></paramdef>
<paramdef>unsigned <parameter>n</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_message_append_string_space</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>size_t <parameter>size</parameter></paramdef>
<paramdef>char **<parameter>s</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The functions
<function>sd_bus_message_append_string_memfd</function> and
<function>sd_bus_message_append_string_iovec</function> can be
used to append a single string (item of type <literal>s</literal>)
to message <parameter>m</parameter>.</para>
<para>In case of
<function>sd_bus_message_append_string_memfd</function>, the
contents of <parameter>memfd</parameter> are the string. They must
satisfy the same constraints as described for the
<literal>s</literal> type in
<citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
<para>In case of
<function>sd_bus_message_append_string_iovec</function>, the
payload of <parameter>iov</parameter> is the string. It must
satisfy the same constraints as described for the
<literal>s</literal> type in
<citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
<para>The <parameter>iov</parameter> argument must point to
<parameter>n</parameter> <structname>struct iovec</structname>
structures. Each structure may have the
<structname>iov_base</structname> field set, in which case the
memory pointed to will be copied into the message, or unset, in
which case a block of spaces (ASCII 32) of length
<structname>iov_len</structname> will be inserted. The
memory pointed at by <parameter>iov</parameter> may be changed
after this call.</para>
<para>The
<function>sd_bus_message_append_string_space</function> function appends
space for a string to message <parameter>m</parameter>. It behaves
similar to <function>sd_bus_message_append_basic</function> with
type <literal>s</literal>, but instead of copying a string into
the message, it returns a pointer to the destination area to
the caller in pointer <parameter>p</parameter>. Space for the string
of length <parameter>size</parameter> plus the terminating
<constant>NUL</constant> is allocated.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, those calls return 0 or a positive integer. On
failure, they returns a negative errno-style error code.</para>
</refsect1>
<xi:include href="sd_bus_message_append_basic.xml" xpointer="errors" />
<refsect1>
<title>Notes</title>
<para>The functions 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_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink>
</para>
</refsect1>
</refentry>
|
