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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 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 | ||
24 | <refentry id="sd_session_is_active"> | |
25 | ||
26 | <refentryinfo> | |
27 | <title>sd_session_is_active</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_session_is_active</refentrytitle> | |
42 | <manvolnum>3</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>sd_session_is_active</refname> | |
47 | <refname>sd_session_get_uid</refname> | |
48 | <refname>sd_session_get_seat</refname> | |
eff40633 | 49 | <refname>sd_session_get_service</refname> |
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50 | <refname>sd_session_get_type</refname> |
51 | <refname>sd_session_get_class</refname> | |
52 | <refname>sd_session_get_display</refname> | |
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53 | <refpurpose>Determine state of a specific session</refpurpose> |
54 | </refnamediv> | |
55 | ||
56 | <refsynopsisdiv> | |
57 | <funcsynopsis> | |
58 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
59 | ||
60 | <funcprototype> | |
61 | <funcdef>int <function>sd_session_is_active</function></funcdef> | |
62 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
63 | </funcprototype> | |
64 | ||
65 | <funcprototype> | |
66 | <funcdef>int <function>sd_session_get_uid</function></funcdef> | |
67 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
68 | <paramdef>uid_t* <parameter>uid</parameter></paramdef> | |
69 | </funcprototype> | |
70 | ||
71 | <funcprototype> | |
72 | <funcdef>int <function>sd_session_get_seat</function></funcdef> | |
73 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
74 | <paramdef>char** <parameter>seat</parameter></paramdef> | |
75 | </funcprototype> | |
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76 | |
77 | <funcprototype> | |
78 | <funcdef>int <function>sd_session_get_service</function></funcdef> | |
79 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
80 | <paramdef>char** <parameter>service</parameter></paramdef> | |
81 | </funcprototype> | |
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82 | |
83 | <funcprototype> | |
84 | <funcdef>int <function>sd_session_get_type</function></funcdef> | |
85 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
86 | <paramdef>char** <parameter>type</parameter></paramdef> | |
87 | </funcprototype> | |
88 | ||
89 | <funcprototype> | |
90 | <funcdef>int <function>sd_session_get_class</function></funcdef> | |
91 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
92 | <paramdef>char** <parameter>class</parameter></paramdef> | |
93 | </funcprototype> | |
94 | ||
95 | <funcprototype> | |
96 | <funcdef>int <function>sd_session_get_display</function></funcdef> | |
97 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
98 | <paramdef>char** <parameter>display</parameter></paramdef> | |
99 | </funcprototype> | |
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100 | </funcsynopsis> |
101 | </refsynopsisdiv> | |
102 | ||
103 | <refsect1> | |
104 | <title>Description</title> | |
105 | ||
106 | <para><function>sd_session_is_active()</function> may | |
107 | be used to determine whether the session identified by | |
108 | the specified session identifier is currently active | |
109 | (i.e. currently in the foreground and available for | |
110 | user input) or not.</para> | |
111 | ||
112 | <para><function>sd_session_get_uid()</function> may be | |
113 | used to determine the user identifier of the Unix user the session | |
114 | identified by the specified session identifier belongs | |
115 | to.</para> | |
116 | ||
117 | <para><function>sd_session_get_seat()</function> may | |
118 | be used to determine the seat identifier of the seat | |
119 | the session identified by the specified session | |
120 | identifier belongs to. Note that not all sessions are | |
121 | attached to a seat, this call will fail for them. The | |
122 | returned string needs to be freed with the libc | |
123 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
124 | call after use.</para> | |
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125 | |
126 | <para><function>sd_session_get_service()</function> | |
127 | may be used to determine the name of the service (as | |
128 | passed during PAM session setup) that registered the | |
129 | session identified by the specified session | |
130 | identifier. The returned string needs to be freed with | |
131 | the libc | |
132 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
133 | call after use.</para> | |
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134 | |
135 | <para><function>sd_session_get_type()</function> may | |
136 | be used to determine the type of the session | |
137 | identified by the specified session identifier. The | |
138 | returned string is one of <literal>x11</literal>, | |
139 | <literal>tty</literal> or | |
140 | <literal>unspecified</literal> and needs to be freed | |
141 | with the libc | |
142 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
143 | call after use.</para> | |
144 | ||
145 | <para><function>sd_session_get_class()</function> may | |
146 | be used to determine the class of the session | |
147 | identified by the specified session identifier. The | |
148 | returned string is one of <literal>user</literal>, | |
149 | <literal>greeter</literal> or | |
150 | <literal>lock-screen</literal> and needs to be freed | |
151 | with the libc | |
152 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
153 | call after use.</para> | |
154 | ||
155 | <para><function>sd_session_get_display()</function> | |
156 | may be used to determine the X11 display of the | |
157 | session identified by the specified session | |
158 | identifier. The returned string is one of needs to be | |
159 | freed with the libc | |
160 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
161 | call after use.</para> | |
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162 | |
163 | <para>If the <literal>session</literal> parameter of | |
164 | any of these functions is passed as NULL the operation | |
165 | is executed for the session the calling process is a | |
166 | member of, if there is any.</para> | |
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167 | </refsect1> |
168 | ||
169 | <refsect1> | |
170 | <title>Return Value</title> | |
171 | ||
172 | <para>If the test succeeds | |
173 | <function>sd_session_is_active()</function> returns a | |
174 | positive integer, if it fails 0. On success | |
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175 | <function>sd_session_get_uid()</function>, |
176 | <function>sd_session_get_service()</function> and | |
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177 | <function>sd_session_get_seat()</function> return 0 or |
178 | a positive integer. On failure, these calls return a | |
179 | negative errno-style error code.</para> | |
180 | </refsect1> | |
181 | ||
182 | <refsect1> | |
183 | <title>Notes</title> | |
184 | ||
185 | <para>The <function>sd_session_is_active()</function>, | |
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186 | <function>sd_session_get_uid()</function>, |
187 | <function>sd_session_get_service()</function> and | |
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188 | <function>sd_session_get_seat()</function> interfaces |
189 | are available as shared library, which can be compiled | |
190 | and linked to with the | |
191 | <literal>libsystemd-login</literal> | |
192 | <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
193 | file.</para> | |
194 | </refsect1> | |
195 | ||
196 | <refsect1> | |
197 | <title>See Also</title> | |
198 | ||
199 | <para> | |
200 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
201 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
595aae37 | 202 | <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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203 | </para> |
204 | </refsect1> | |
205 | ||
206 | </refentry> |