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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 | ||
56ba3c78 | 24 | <refentry id="sd_session_is_active" conditional='HAVE_PAM'> |
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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> | |
7ea9cb91 | 47 | <refname>sd_session_get_state</refname> |
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48 | <refname>sd_session_get_uid</refname> |
49 | <refname>sd_session_get_seat</refname> | |
eff40633 | 50 | <refname>sd_session_get_service</refname> |
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51 | <refname>sd_session_get_type</refname> |
52 | <refname>sd_session_get_class</refname> | |
53 | <refname>sd_session_get_display</refname> | |
c84f5e4a | 54 | <refname>sd_session_get_tty</refname> |
44ded3ab | 55 | <refname>sd_session_get_vt</refname> |
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56 | <refpurpose>Determine state of a specific session</refpurpose> |
57 | </refnamediv> | |
58 | ||
59 | <refsynopsisdiv> | |
60 | <funcsynopsis> | |
61 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
62 | ||
63 | <funcprototype> | |
64 | <funcdef>int <function>sd_session_is_active</function></funcdef> | |
65 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
66 | </funcprototype> | |
67 | ||
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68 | <funcprototype> |
69 | <funcdef>int <function>sd_session_get_state</function></funcdef> | |
70 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
71 | <paramdef>char** <parameter>state</parameter></paramdef> | |
72 | </funcprototype> | |
73 | ||
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74 | <funcprototype> |
75 | <funcdef>int <function>sd_session_get_uid</function></funcdef> | |
76 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
77 | <paramdef>uid_t* <parameter>uid</parameter></paramdef> | |
78 | </funcprototype> | |
79 | ||
80 | <funcprototype> | |
81 | <funcdef>int <function>sd_session_get_seat</function></funcdef> | |
82 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
83 | <paramdef>char** <parameter>seat</parameter></paramdef> | |
84 | </funcprototype> | |
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85 | |
86 | <funcprototype> | |
87 | <funcdef>int <function>sd_session_get_service</function></funcdef> | |
88 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
89 | <paramdef>char** <parameter>service</parameter></paramdef> | |
90 | </funcprototype> | |
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91 | |
92 | <funcprototype> | |
93 | <funcdef>int <function>sd_session_get_type</function></funcdef> | |
94 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
95 | <paramdef>char** <parameter>type</parameter></paramdef> | |
96 | </funcprototype> | |
97 | ||
98 | <funcprototype> | |
99 | <funcdef>int <function>sd_session_get_class</function></funcdef> | |
100 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
101 | <paramdef>char** <parameter>class</parameter></paramdef> | |
102 | </funcprototype> | |
103 | ||
104 | <funcprototype> | |
105 | <funcdef>int <function>sd_session_get_display</function></funcdef> | |
106 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
107 | <paramdef>char** <parameter>display</parameter></paramdef> | |
108 | </funcprototype> | |
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109 | |
110 | <funcprototype> | |
111 | <funcdef>int <function>sd_session_get_tty</function></funcdef> | |
112 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
113 | <paramdef>char** <parameter>tty</parameter></paramdef> | |
114 | </funcprototype> | |
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115 | |
116 | <funcprototype> | |
117 | <funcdef>int <function>sd_session_get_vt</function></funcdef> | |
118 | <paramdef>const char* <parameter>session</parameter></paramdef> | |
119 | <paramdef>unsigned* <parameter>vt</parameter></paramdef> | |
120 | </funcprototype> | |
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121 | </funcsynopsis> |
122 | </refsynopsisdiv> | |
123 | ||
124 | <refsect1> | |
125 | <title>Description</title> | |
126 | ||
127 | <para><function>sd_session_is_active()</function> may | |
128 | be used to determine whether the session identified by | |
129 | the specified session identifier is currently active | |
130 | (i.e. currently in the foreground and available for | |
131 | user input) or not.</para> | |
132 | ||
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133 | <para><function>sd_session_get_state()</function> may |
134 | be used to determine the state of the session | |
135 | identified by the specified session identifier. The | |
136 | following states are currently known: | |
137 | <literal>online</literal> (session logged in, but | |
138 | session not active, i.e. not in the foreground), | |
139 | <literal>active</literal> (session logged in and | |
140 | active, i.e. in the foreground), | |
141 | <literal>closing</literal> (session nominally logged | |
142 | out, but some processes belonging to it are still | |
143 | around). In the future additional states might be | |
144 | defined, client code should be written to be robust in | |
145 | regards to additional state strings being | |
146 | returned. This function is a more generic version of | |
147 | <function>sd_session_is_active()</function>. The returned | |
148 | string needs to be freed with the libc | |
149 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
150 | call after use.</para> | |
151 | ||
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152 | <para><function>sd_session_get_uid()</function> may be |
153 | used to determine the user identifier of the Unix user the session | |
154 | identified by the specified session identifier belongs | |
155 | to.</para> | |
156 | ||
157 | <para><function>sd_session_get_seat()</function> may | |
158 | be used to determine the seat identifier of the seat | |
159 | the session identified by the specified session | |
160 | identifier belongs to. Note that not all sessions are | |
161 | attached to a seat, this call will fail for them. The | |
162 | returned string needs to be freed with the libc | |
163 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
164 | call after use.</para> | |
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165 | |
166 | <para><function>sd_session_get_service()</function> | |
167 | may be used to determine the name of the service (as | |
168 | passed during PAM session setup) that registered the | |
169 | session identified by the specified session | |
170 | identifier. The returned string needs to be freed with | |
171 | the libc | |
172 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
173 | call after use.</para> | |
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174 | |
175 | <para><function>sd_session_get_type()</function> may | |
176 | be used to determine the type of the session | |
177 | identified by the specified session identifier. The | |
178 | returned string is one of <literal>x11</literal>, | |
179 | <literal>tty</literal> or | |
180 | <literal>unspecified</literal> and needs to be freed | |
181 | with the libc | |
182 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
183 | call after use.</para> | |
184 | ||
185 | <para><function>sd_session_get_class()</function> may | |
186 | be used to determine the class of the session | |
187 | identified by the specified session identifier. The | |
188 | returned string is one of <literal>user</literal>, | |
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189 | <literal>greeter</literal>, |
190 | <literal>lock-screen</literal>, or | |
191 | <literal>background</literal> and needs to be freed | |
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192 | with the libc |
193 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
194 | call after use.</para> | |
195 | ||
196 | <para><function>sd_session_get_display()</function> | |
197 | may be used to determine the X11 display of the | |
198 | session identified by the specified session | |
a485210c | 199 | identifier. The returned string needs to be |
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200 | freed with the libc |
201 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
202 | call after use.</para> | |
50b1678a | 203 | |
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204 | <para><function>sd_session_get_tty()</function> |
205 | may be used to determine the TTY device of the | |
206 | session identified by the specified session | |
a485210c | 207 | identifier. The returned string needs to be |
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208 | freed with the libc |
209 | <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
210 | call after use.</para> | |
211 | ||
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212 | <para><function>sd_session_get_vt()</function> |
213 | may be used to determine the VT number of the | |
214 | session identified by the specified session | |
215 | identifier. This function will return an error if | |
216 | the seat does not support VTs.</para> | |
217 | ||
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218 | <para>If the <varname>session</varname> parameter of |
219 | any of these functions is passed as | |
220 | <constant>NULL</constant> the operation is executed | |
221 | for the session the calling process is a member of, if | |
222 | there is any.</para> | |
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223 | </refsect1> |
224 | ||
225 | <refsect1> | |
226 | <title>Return Value</title> | |
227 | ||
228 | <para>If the test succeeds | |
229 | <function>sd_session_is_active()</function> returns a | |
230 | positive integer, if it fails 0. On success | |
20747498 | 231 | <function>sd_session_get_state()</function>, |
eff40633 | 232 | <function>sd_session_get_uid()</function>, |
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233 | <function>sd_session_get_seat()</function>, |
234 | <function>sd_session_get_service()</function>, | |
235 | <function>sd_session_get_type()</function>, | |
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236 | <function>sd_session_get_class()</function>, |
237 | <function>sd_session_get_display()</function> and | |
238 | <function>sd_session_get_tty()</function> return 0 or | |
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239 | a positive integer. On failure, these calls return a |
240 | negative errno-style error code.</para> | |
241 | </refsect1> | |
242 | ||
243 | <refsect1> | |
244 | <title>Notes</title> | |
245 | ||
246 | <para>The <function>sd_session_is_active()</function>, | |
20747498 | 247 | <function>sd_session_get_state()</function>, |
eff40633 | 248 | <function>sd_session_get_uid()</function>, |
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249 | <function>sd_session_get_seat()</function>, |
250 | <function>sd_session_get_service()</function>, | |
251 | <function>sd_session_get_type()</function>, | |
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252 | <function>sd_session_get_class()</function>, |
253 | <function>sd_session_get_display()</function> and | |
254 | <function>sd_session_get_tty()</function> | |
255 | interfaces are available as shared library, which can | |
256 | be compiled and linked to with the | |
1e158d27 | 257 | <constant>libsystemd-login</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
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258 | file.</para> |
259 | </refsect1> | |
260 | ||
261 | <refsect1> | |
262 | <title>See Also</title> | |
263 | ||
264 | <para> | |
265 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
cb07866b | 266 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
595aae37 | 267 | <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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268 | </para> |
269 | </refsect1> | |
270 | ||
271 | </refentry> |