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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2010 Lennart Poettering | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
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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 | |
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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 | |
5430f7f2 | 18 | Lesser General Public License for more details. |
0b3b020a | 19 | |
5430f7f2 | 20 | You should have received a copy of the GNU Lesser General Public License |
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21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
22 | --> | |
23 | ||
56ba3c78 | 24 | <refentry id="sd_get_seats" conditional='HAVE_PAM'> |
0b3b020a | 25 | |
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26 | <refentryinfo> |
27 | <title>sd_get_seats</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>Developer</contrib> | |
33 | <firstname>Lennart</firstname> | |
34 | <surname>Poettering</surname> | |
35 | <email>lennart@poettering.net</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>sd_get_seats</refentrytitle> | |
42 | <manvolnum>3</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>sd_get_seats</refname> | |
47 | <refname>sd_get_sessions</refname> | |
48 | <refname>sd_get_uids</refname> | |
49 | <refname>sd_get_machine_names</refname> | |
50 | <refpurpose>Determine available seats, sessions, logged in users and virtual machines/containers</refpurpose> | |
51 | </refnamediv> | |
52 | ||
53 | <refsynopsisdiv> | |
54 | <funcsynopsis> | |
55 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
56 | ||
57 | <funcprototype> | |
58 | <funcdef>int <function>sd_get_seats</function></funcdef> | |
59 | <paramdef>char ***<parameter>seats</parameter></paramdef> | |
60 | </funcprototype> | |
61 | ||
62 | <funcprototype> | |
63 | <funcdef>int <function>sd_get_sessions</function></funcdef> | |
64 | <paramdef>char ***<parameter>sessions</parameter></paramdef> | |
65 | </funcprototype> | |
66 | ||
67 | <funcprototype> | |
68 | <funcdef>int <function>sd_get_uids</function></funcdef> | |
69 | <paramdef>uid_t **<parameter>users</parameter></paramdef> | |
70 | </funcprototype> | |
71 | ||
72 | <funcprototype> | |
73 | <funcdef>int <function>sd_get_machine_names</function></funcdef> | |
74 | <paramdef>char ***<parameter>machines</parameter></paramdef> | |
75 | </funcprototype> | |
76 | ||
77 | </funcsynopsis> | |
78 | </refsynopsisdiv> | |
79 | ||
80 | <refsect1> | |
81 | <title>Description</title> | |
82 | ||
83 | <para><function>sd_get_seats()</function> may be used to determine | |
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84 | all currently available local seats. Returns the number of seat |
85 | identifiers and if the input pointer is non-NULL, a | |
86 | <constant>NULL</constant>-terminated array of seat identifiers | |
87 | is stored at the address. | |
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88 | The returned array and all strings it references need to be freed |
89 | with the libc | |
90 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
91 | call after use. Note that instead of an empty array | |
92 | <constant>NULL</constant> may be returned and should be considered | |
93 | equivalent to an empty array.</para> | |
94 | ||
95 | <para>Similarly, <function>sd_get_sessions()</function> may be | |
96 | used to determine all current login sessions.</para> | |
97 | ||
98 | <para>Similarly, <function>sd_get_uids()</function> may be used to | |
99 | determine all Unix users who currently have login sessions.</para> | |
100 | ||
101 | <para>Similarly, <function>sd_get_machine_names()</function> may | |
102 | be used to determine all current virtual machines and containers | |
103 | on the system.</para> | |
104 | ||
105 | <para>Note that the returned lists are not sorted and in an | |
106 | undefined order.</para> | |
107 | </refsect1> | |
108 | ||
109 | <refsect1> | |
110 | <title>Return Value</title> | |
111 | ||
112 | <para>On success, <function>sd_get_seats()</function>, | |
113 | <function>sd_get_sessions()</function>, | |
114 | <function>sd_get_uids()</function> and | |
115 | <function>sd_get_machine_names()</function> return the number of | |
116 | entries in the arrays. On failure, these calls return a negative | |
117 | errno-style error code.</para> | |
118 | </refsect1> | |
119 | ||
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120 | |
121 | <refsect1> | |
122 | <title>Errors</title> | |
123 | ||
124 | <para>Returned errors may indicate the following problems:</para> | |
125 | ||
126 | <variablelist> | |
127 | ||
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128 | <varlistentry> |
129 | <term><constant>-ENOMEM</constant></term> | |
130 | ||
131 | <listitem><para>Memory allocation failed.</para></listitem> | |
132 | </varlistentry> | |
133 | </variablelist> | |
134 | </refsect1> | |
135 | ||
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136 | <refsect1> |
137 | <title>Notes</title> | |
138 | ||
139 | <para>The <function>sd_get_seats()</function>, | |
140 | <function>sd_get_sessions()</function>, | |
141 | <function>sd_get_uids()</function> and | |
142 | <function>sd_get_machine_names()</function> interfaces are | |
143 | available as a shared library, which can be compiled and linked to | |
144 | with the | |
145 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
146 | file.</para> | |
147 | </refsect1> | |
148 | ||
149 | <refsect1> | |
150 | <title>See Also</title> | |
151 | ||
152 | <para> | |
153 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
154 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
155 | <citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
156 | </para> | |
157 | </refsect1> | |
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158 | |
159 | </refentry> |