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1 | <?xml version='1.0'?> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> | |
5 | ||
6 | <refentry id="sd_bus_can_send" | |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
8 | ||
9 | <refentryinfo> | |
10 | <title>sd_bus_can_send</title> | |
11 | <productname>systemd</productname> | |
12 | </refentryinfo> | |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>sd_bus_can_send</refentrytitle> | |
16 | <manvolnum>3</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>sd_bus_can_send</refname> | |
21 | ||
22 | <refpurpose>Check which types can be sent over a bus object</refpurpose> | |
23 | </refnamediv> | |
24 | ||
25 | <refsynopsisdiv> | |
26 | <funcsynopsis> | |
27 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
28 | ||
29 | <funcprototype> | |
30 | <funcdef>void <function>sd_bus_can_send</function></funcdef> | |
31 | <paramdef>sd_bus *<parameter>bus</parameter></paramdef> | |
32 | <paramdef>char <parameter>type</parameter></paramdef> | |
33 | </funcprototype> | |
34 | </funcsynopsis> | |
35 | </refsynopsisdiv> | |
36 | ||
37 | <refsect1> | |
38 | <title>Description</title> | |
39 | ||
40 | <para><function>sd_bus_can_send</function> is mostly used for checking if file descriptor | |
41 | passing is available on the given bus. <parameter>type</parameter> can be any of the | |
42 | <constant>SD_BUS_TYPE</constant> constants.</para> | |
43 | </refsect1> | |
44 | ||
45 | <refsect1> | |
46 | <title>Return Value</title> | |
47 | ||
48 | <para>On failure, <function>sd_bus_can_send()</function> returns a negative errno-style error | |
49 | code. If values of the given type can be sent over the given bus, it returns a positive integer. | |
50 | Otherwise, it returns zero.</para> | |
51 | ||
52 | <refsect2> | |
53 | <title>Errors</title> | |
54 | ||
55 | <para>Returned errors may indicate the following problems:</para> | |
56 | ||
57 | <variablelist> | |
58 | <varlistentry> | |
59 | <term><constant>-ENOPKG</constant></term> | |
60 | ||
61 | <listitem><para>The bus object <parameter>bus</parameter> could not be resolved.</para> | |
62 | </listitem> | |
63 | </varlistentry> | |
64 | ||
65 | <varlistentry> | |
66 | <term><constant>-ENOTCONN</constant></term> | |
67 | ||
68 | <listitem><para>The input parameter <parameter>bus</parameter> is | |
69 | <constant>NULL</constant> or the bus is not connected.</para></listitem> | |
70 | </varlistentry> | |
71 | ||
72 | <varlistentry> | |
73 | <term><constant>-ECHILD</constant></term> | |
74 | ||
75 | <listitem><para>The bus object <parameter>bus</parameter> was created in a different | |
76 | process.</para></listitem> | |
77 | </varlistentry> | |
78 | </variablelist> | |
79 | </refsect2> | |
80 | </refsect1> | |
81 | ||
82 | <xi:include href="libsystemd-pkgconfig.xml" /> | |
83 | ||
84 | <refsect1> | |
85 | <title>See Also</title> | |
86 | ||
87 | <para> | |
88 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
89 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
90 | </para> | |
91 | </refsect1> | |
92 | ||
93 | </refentry> |