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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> | |
c573f8f8 | 47 | <refname>sd_session_is_remote</refname> |
7ea9cb91 | 48 | <refname>sd_session_get_state</refname> |
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49 | <refname>sd_session_get_uid</refname> |
50 | <refname>sd_session_get_seat</refname> | |
eff40633 | 51 | <refname>sd_session_get_service</refname> |
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52 | <refname>sd_session_get_type</refname> |
53 | <refname>sd_session_get_class</refname> | |
c72d5456 | 54 | <refname>sd_session_get_desktop</refname> |
81e0d956 | 55 | <refname>sd_session_get_display</refname> |
c84f5e4a | 56 | <refname>sd_session_get_tty</refname> |
44ded3ab | 57 | <refname>sd_session_get_vt</refname> |
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58 | <refname>sd_session_get_remote_host</refname> |
59 | <refname>sd_session_get_remote_user</refname> | |
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60 | <refpurpose>Determine state of a specific session</refpurpose> |
61 | </refnamediv> | |
62 | ||
63 | <refsynopsisdiv> | |
64 | <funcsynopsis> | |
65 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
66 | ||
67 | <funcprototype> | |
68 | <funcdef>int <function>sd_session_is_active</function></funcdef> | |
3b3d7d06 | 69 | <paramdef>const char *<parameter>session</parameter></paramdef> |
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70 | </funcprototype> |
71 | ||
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72 | <funcprototype> |
73 | <funcdef>int <function>sd_session_is_remote</function></funcdef> | |
3b3d7d06 | 74 | <paramdef>const char *<parameter>session</parameter></paramdef> |
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75 | </funcprototype> |
76 | ||
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77 | <funcprototype> |
78 | <funcdef>int <function>sd_session_get_state</function></funcdef> | |
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79 | <paramdef>const char *<parameter>session</parameter></paramdef> |
80 | <paramdef>char **<parameter>state</parameter></paramdef> | |
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81 | </funcprototype> |
82 | ||
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83 | <funcprototype> |
84 | <funcdef>int <function>sd_session_get_uid</function></funcdef> | |
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85 | <paramdef>const char *<parameter>session</parameter></paramdef> |
86 | <paramdef>uid_t *<parameter>uid</parameter></paramdef> | |
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87 | </funcprototype> |
88 | ||
89 | <funcprototype> | |
90 | <funcdef>int <function>sd_session_get_seat</function></funcdef> | |
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91 | <paramdef>const char *<parameter>session</parameter></paramdef> |
92 | <paramdef>char **<parameter>seat</parameter></paramdef> | |
0b3b020a | 93 | </funcprototype> |
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94 | |
95 | <funcprototype> | |
96 | <funcdef>int <function>sd_session_get_service</function></funcdef> | |
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97 | <paramdef>const char *<parameter>session</parameter></paramdef> |
98 | <paramdef>char **<parameter>service</parameter></paramdef> | |
eff40633 | 99 | </funcprototype> |
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100 | |
101 | <funcprototype> | |
102 | <funcdef>int <function>sd_session_get_type</function></funcdef> | |
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103 | <paramdef>const char *<parameter>session</parameter></paramdef> |
104 | <paramdef>char **<parameter>type</parameter></paramdef> | |
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105 | </funcprototype> |
106 | ||
107 | <funcprototype> | |
108 | <funcdef>int <function>sd_session_get_class</function></funcdef> | |
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109 | <paramdef>const char *<parameter>session</parameter></paramdef> |
110 | <paramdef>char **<parameter>class</parameter></paramdef> | |
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111 | </funcprototype> |
112 | ||
c72d5456 DH |
113 | <funcprototype> |
114 | <funcdef>int <function>sd_session_get_desktop</function></funcdef> | |
115 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
116 | <paramdef>char **<parameter>desktop</parameter></paramdef> | |
117 | </funcprototype> | |
118 | ||
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119 | <funcprototype> |
120 | <funcdef>int <function>sd_session_get_display</function></funcdef> | |
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121 | <paramdef>const char *<parameter>session</parameter></paramdef> |
122 | <paramdef>char **<parameter>display</parameter></paramdef> | |
81e0d956 | 123 | </funcprototype> |
c84f5e4a | 124 | |
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125 | <funcprototype> |
126 | <funcdef>int <function>sd_session_get_remote_host</function></funcdef> | |
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127 | <paramdef>const char *<parameter>session</parameter></paramdef> |
128 | <paramdef>char **<parameter>remote_host</parameter></paramdef> | |
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129 | </funcprototype> |
130 | ||
131 | <funcprototype> | |
132 | <funcdef>int <function>sd_session_get_remote_user</function></funcdef> | |
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133 | <paramdef>const char *<parameter>session</parameter></paramdef> |
134 | <paramdef>char **<parameter>remote_user</parameter></paramdef> | |
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135 | </funcprototype> |
136 | ||
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137 | <funcprototype> |
138 | <funcdef>int <function>sd_session_get_tty</function></funcdef> | |
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139 | <paramdef>const char *<parameter>session</parameter></paramdef> |
140 | <paramdef>char **<parameter>tty</parameter></paramdef> | |
c84f5e4a | 141 | </funcprototype> |
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142 | |
143 | <funcprototype> | |
144 | <funcdef>int <function>sd_session_get_vt</function></funcdef> | |
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145 | <paramdef>const char *<parameter>session</parameter></paramdef> |
146 | <paramdef>unsigned int *<parameter>vt</parameter></paramdef> | |
44ded3ab | 147 | </funcprototype> |
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148 | </funcsynopsis> |
149 | </refsynopsisdiv> | |
150 | ||
151 | <refsect1> | |
152 | <title>Description</title> | |
153 | ||
154 | <para><function>sd_session_is_active()</function> may | |
155 | be used to determine whether the session identified by | |
156 | the specified session identifier is currently active | |
157 | (i.e. currently in the foreground and available for | |
158 | user input) or not.</para> | |
159 | ||
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160 | <para><function>sd_session_is_remote()</function> may |
161 | be used to determine whether the session identified by | |
162 | the specified session identifier is a remote session | |
163 | (i.e. its remote host is known) or not.</para> | |
164 | ||
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165 | <para><function>sd_session_get_state()</function> may |
166 | be used to determine the state of the session | |
167 | identified by the specified session identifier. The | |
168 | following states are currently known: | |
169 | <literal>online</literal> (session logged in, but | |
170 | session not active, i.e. not in the foreground), | |
171 | <literal>active</literal> (session logged in and | |
172 | active, i.e. in the foreground), | |
173 | <literal>closing</literal> (session nominally logged | |
174 | out, but some processes belonging to it are still | |
175 | around). In the future additional states might be | |
176 | defined, client code should be written to be robust in | |
177 | regards to additional state strings being | |
178 | returned. This function is a more generic version of | |
179 | <function>sd_session_is_active()</function>. The returned | |
180 | string needs to be freed with the libc | |
5aded369 | 181 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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182 | call after use.</para> |
183 | ||
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184 | <para><function>sd_session_get_uid()</function> may be |
185 | used to determine the user identifier of the Unix user the session | |
186 | identified by the specified session identifier belongs | |
187 | to.</para> | |
188 | ||
189 | <para><function>sd_session_get_seat()</function> may | |
190 | be used to determine the seat identifier of the seat | |
191 | the session identified by the specified session | |
192 | identifier belongs to. Note that not all sessions are | |
193 | attached to a seat, this call will fail for them. The | |
194 | returned string needs to be freed with the libc | |
5aded369 | 195 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
0b3b020a | 196 | call after use.</para> |
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197 | |
198 | <para><function>sd_session_get_service()</function> | |
199 | may be used to determine the name of the service (as | |
200 | passed during PAM session setup) that registered the | |
201 | session identified by the specified session | |
202 | identifier. The returned string needs to be freed with | |
203 | the libc | |
5aded369 | 204 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
eff40633 | 205 | call after use.</para> |
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206 | |
207 | <para><function>sd_session_get_type()</function> may | |
208 | be used to determine the type of the session | |
209 | identified by the specified session identifier. The | |
210 | returned string is one of <literal>x11</literal>, | |
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211 | <literal>wayland</literal>, <literal>tty</literal>, |
212 | <literal>mir</literal> or <literal>unspecified</literal> and | |
213 | needs to be freed with the libc | |
5aded369 | 214 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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215 | call after use.</para> |
216 | ||
217 | <para><function>sd_session_get_class()</function> may | |
218 | be used to determine the class of the session | |
219 | identified by the specified session identifier. The | |
220 | returned string is one of <literal>user</literal>, | |
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221 | <literal>greeter</literal>, |
222 | <literal>lock-screen</literal>, or | |
223 | <literal>background</literal> and needs to be freed | |
81e0d956 | 224 | with the libc |
5aded369 | 225 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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226 | call after use.</para> |
227 | ||
c72d5456 DH |
228 | <para><function>sd_session_get_desktop()</function> may |
229 | be used to determine the brand of the desktop running on | |
230 | the session identified by the specified session identifier. | |
231 | This field can be set freely by desktop environments and | |
232 | does not follow any special formatting. However, desktops | |
233 | are strongly recommended to use the same identifiers and | |
234 | capitalization as for | |
235 | <varname>$XDG_CURRENT_DESKTOP</varname>, as defined by | |
236 | the <ulink | |
237 | url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop | |
238 | Entry | |
239 | Specification</ulink>. The returned string needs to be | |
240 | freed with the libc | |
241 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
242 | call after use.</para> | |
243 | ||
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244 | <para><function>sd_session_get_display()</function> |
245 | may be used to determine the X11 display of the | |
246 | session identified by the specified session | |
a485210c | 247 | identifier. The returned string needs to be |
81e0d956 | 248 | freed with the libc |
5aded369 | 249 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
81e0d956 | 250 | call after use.</para> |
50b1678a | 251 | |
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252 | <para><function>sd_session_get_remote_host()</function> |
253 | may be used to determine the remote hostname of the | |
254 | session identified by the specified session | |
255 | identifier. The returned string needs to be | |
256 | freed with the libc | |
5aded369 | 257 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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258 | call after use.</para> |
259 | ||
260 | <para><function>sd_session_get_remote_user()</function> | |
261 | may be used to determine the remote username of the | |
262 | session identified by the specified session | |
263 | identifier. The returned string needs to be | |
264 | freed with the libc | |
5aded369 | 265 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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266 | call after use. Note that this value is rarely known |
267 | to the system, and even then should not be relied on.</para> | |
268 | ||
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269 | <para><function>sd_session_get_tty()</function> |
270 | may be used to determine the TTY device of the | |
271 | session identified by the specified session | |
a485210c | 272 | identifier. The returned string needs to be |
c84f5e4a | 273 | freed with the libc |
5aded369 | 274 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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275 | call after use.</para> |
276 | ||
44ded3ab GC |
277 | <para><function>sd_session_get_vt()</function> |
278 | may be used to determine the VT number of the | |
279 | session identified by the specified session | |
280 | identifier. This function will return an error if | |
281 | the seat does not support VTs.</para> | |
282 | ||
74d00578 ZJS |
283 | <para>If the <varname>session</varname> parameter of |
284 | any of these functions is passed as | |
79640424 | 285 | <constant>NULL</constant>, the operation is executed |
74d00578 ZJS |
286 | for the session the calling process is a member of, if |
287 | there is any.</para> | |
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288 | </refsect1> |
289 | ||
290 | <refsect1> | |
291 | <title>Return Value</title> | |
292 | ||
79640424 | 293 | <para>If the test succeeds, |
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294 | <function>sd_session_is_active()</function> and |
295 | <function>sd_session_is_remote()</function> return a | |
b040723e | 296 | positive integer; if it fails, 0. On success, |
20747498 | 297 | <function>sd_session_get_state()</function>, |
eff40633 | 298 | <function>sd_session_get_uid()</function>, |
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299 | <function>sd_session_get_seat()</function>, |
300 | <function>sd_session_get_service()</function>, | |
301 | <function>sd_session_get_type()</function>, | |
c84f5e4a | 302 | <function>sd_session_get_class()</function>, |
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303 | <function>sd_session_get_display()</function>, |
304 | <function>sd_session_get_remote_user()</function>, | |
305 | <function>sd_session_get_remote_host()</function> and | |
c84f5e4a | 306 | <function>sd_session_get_tty()</function> return 0 or |
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307 | a positive integer. On failure, these calls return a |
308 | negative errno-style error code.</para> | |
309 | </refsect1> | |
310 | ||
311 | <refsect1> | |
312 | <title>Notes</title> | |
313 | ||
314 | <para>The <function>sd_session_is_active()</function>, | |
20747498 | 315 | <function>sd_session_get_state()</function>, |
eff40633 | 316 | <function>sd_session_get_uid()</function>, |
20747498 LP |
317 | <function>sd_session_get_seat()</function>, |
318 | <function>sd_session_get_service()</function>, | |
319 | <function>sd_session_get_type()</function>, | |
c84f5e4a | 320 | <function>sd_session_get_class()</function>, |
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321 | <function>sd_session_get_display()</function>, |
322 | <function>sd_session_get_remote_host()</function>, | |
323 | <function>sd_session_get_remote_user()</function> and | |
c84f5e4a | 324 | <function>sd_session_get_tty()</function> |
494a6682 | 325 | interfaces are available as a shared library, which can |
c84f5e4a | 326 | be compiled and linked to with the |
5aded369 | 327 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
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328 | file.</para> |
329 | </refsect1> | |
330 | ||
331 | <refsect1> | |
332 | <title>See Also</title> | |
333 | ||
334 | <para> | |
335 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
cb07866b | 336 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
595aae37 | 337 | <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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338 | </para> |
339 | </refsect1> | |
340 | ||
341 | </refentry> |