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0b3b020a | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
0307f791 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> |
0b3b020a | 5 | |
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6 | <refentry id="sd_get_seats" conditional='HAVE_PAM' |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
0b3b020a | 8 | |
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9 | <refentryinfo> |
10 | <title>sd_get_seats</title> | |
11 | <productname>systemd</productname> | |
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12 | </refentryinfo> |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>sd_get_seats</refentrytitle> | |
16 | <manvolnum>3</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>sd_get_seats</refname> | |
21 | <refname>sd_get_sessions</refname> | |
22 | <refname>sd_get_uids</refname> | |
23 | <refname>sd_get_machine_names</refname> | |
24 | <refpurpose>Determine available seats, sessions, logged in users and virtual machines/containers</refpurpose> | |
25 | </refnamediv> | |
26 | ||
27 | <refsynopsisdiv> | |
28 | <funcsynopsis> | |
29 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
30 | ||
31 | <funcprototype> | |
32 | <funcdef>int <function>sd_get_seats</function></funcdef> | |
33 | <paramdef>char ***<parameter>seats</parameter></paramdef> | |
34 | </funcprototype> | |
35 | ||
36 | <funcprototype> | |
37 | <funcdef>int <function>sd_get_sessions</function></funcdef> | |
38 | <paramdef>char ***<parameter>sessions</parameter></paramdef> | |
39 | </funcprototype> | |
40 | ||
41 | <funcprototype> | |
42 | <funcdef>int <function>sd_get_uids</function></funcdef> | |
43 | <paramdef>uid_t **<parameter>users</parameter></paramdef> | |
44 | </funcprototype> | |
45 | ||
46 | <funcprototype> | |
47 | <funcdef>int <function>sd_get_machine_names</function></funcdef> | |
48 | <paramdef>char ***<parameter>machines</parameter></paramdef> | |
49 | </funcprototype> | |
50 | ||
51 | </funcsynopsis> | |
52 | </refsynopsisdiv> | |
53 | ||
54 | <refsect1> | |
55 | <title>Description</title> | |
56 | ||
57 | <para><function>sd_get_seats()</function> may be used to determine | |
ff5d2cd0 YW |
58 | all currently available local seats. Returns the number of seat |
59 | identifiers and if the input pointer is non-NULL, a | |
60 | <constant>NULL</constant>-terminated array of seat identifiers | |
61 | is stored at the address. | |
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62 | The returned array and all strings it references need to be freed |
63 | with the libc | |
64 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
65 | call after use. Note that instead of an empty array | |
66 | <constant>NULL</constant> may be returned and should be considered | |
67 | equivalent to an empty array.</para> | |
68 | ||
69 | <para>Similarly, <function>sd_get_sessions()</function> may be | |
70 | used to determine all current login sessions.</para> | |
71 | ||
72 | <para>Similarly, <function>sd_get_uids()</function> may be used to | |
73 | determine all Unix users who currently have login sessions.</para> | |
74 | ||
75 | <para>Similarly, <function>sd_get_machine_names()</function> may | |
76 | be used to determine all current virtual machines and containers | |
77 | on the system.</para> | |
78 | ||
79 | <para>Note that the returned lists are not sorted and in an | |
80 | undefined order.</para> | |
81 | </refsect1> | |
82 | ||
83 | <refsect1> | |
84 | <title>Return Value</title> | |
85 | ||
86 | <para>On success, <function>sd_get_seats()</function>, | |
87 | <function>sd_get_sessions()</function>, | |
88 | <function>sd_get_uids()</function> and | |
89 | <function>sd_get_machine_names()</function> return the number of | |
90 | entries in the arrays. On failure, these calls return a negative | |
91 | errno-style error code.</para> | |
92 | </refsect1> | |
93 | ||
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94 | <refsect1> |
95 | <title>Errors</title> | |
96 | ||
97 | <para>Returned errors may indicate the following problems:</para> | |
98 | ||
99 | <variablelist> | |
100 | ||
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101 | <varlistentry> |
102 | <term><constant>-ENOMEM</constant></term> | |
103 | ||
104 | <listitem><para>Memory allocation failed.</para></listitem> | |
105 | </varlistentry> | |
106 | </variablelist> | |
107 | </refsect1> | |
108 | ||
7d6b2723 | 109 | <xi:include href="libsystemd-pkgconfig.xml" /> |
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110 | |
111 | <refsect1> | |
112 | <title>See Also</title> | |
113 | ||
114 | <para> | |
115 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
116 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
117 | <citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
118 | </para> | |
119 | </refsect1> | |
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120 | |
121 | </refentry> |