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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_session_is_active" conditional='HAVE_PAM' |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
0b3b020a | 8 | |
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9 | <refentryinfo> |
10 | <title>sd_session_is_active</title> | |
11 | <productname>systemd</productname> | |
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12 | </refentryinfo> |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>sd_session_is_active</refentrytitle> | |
16 | <manvolnum>3</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>sd_session_is_active</refname> | |
21 | <refname>sd_session_is_remote</refname> | |
22 | <refname>sd_session_get_state</refname> | |
23 | <refname>sd_session_get_uid</refname> | |
24 | <refname>sd_session_get_seat</refname> | |
25 | <refname>sd_session_get_service</refname> | |
26 | <refname>sd_session_get_type</refname> | |
27 | <refname>sd_session_get_class</refname> | |
28 | <refname>sd_session_get_desktop</refname> | |
29 | <refname>sd_session_get_display</refname> | |
30 | <refname>sd_session_get_tty</refname> | |
31 | <refname>sd_session_get_vt</refname> | |
32 | <refname>sd_session_get_remote_host</refname> | |
33 | <refname>sd_session_get_remote_user</refname> | |
34 | <refpurpose>Determine state of a specific session</refpurpose> | |
35 | </refnamediv> | |
36 | ||
37 | <refsynopsisdiv> | |
38 | <funcsynopsis> | |
39 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
40 | ||
41 | <funcprototype> | |
42 | <funcdef>int <function>sd_session_is_active</function></funcdef> | |
43 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
44 | </funcprototype> | |
45 | ||
46 | <funcprototype> | |
47 | <funcdef>int <function>sd_session_is_remote</function></funcdef> | |
48 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
49 | </funcprototype> | |
50 | ||
51 | <funcprototype> | |
52 | <funcdef>int <function>sd_session_get_state</function></funcdef> | |
53 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
54 | <paramdef>char **<parameter>state</parameter></paramdef> | |
55 | </funcprototype> | |
56 | ||
57 | <funcprototype> | |
58 | <funcdef>int <function>sd_session_get_uid</function></funcdef> | |
59 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
60 | <paramdef>uid_t *<parameter>uid</parameter></paramdef> | |
61 | </funcprototype> | |
62 | ||
63 | <funcprototype> | |
64 | <funcdef>int <function>sd_session_get_seat</function></funcdef> | |
65 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
66 | <paramdef>char **<parameter>seat</parameter></paramdef> | |
67 | </funcprototype> | |
68 | ||
69 | <funcprototype> | |
70 | <funcdef>int <function>sd_session_get_service</function></funcdef> | |
71 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
72 | <paramdef>char **<parameter>service</parameter></paramdef> | |
73 | </funcprototype> | |
74 | ||
75 | <funcprototype> | |
76 | <funcdef>int <function>sd_session_get_type</function></funcdef> | |
77 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
78 | <paramdef>char **<parameter>type</parameter></paramdef> | |
79 | </funcprototype> | |
80 | ||
81 | <funcprototype> | |
82 | <funcdef>int <function>sd_session_get_class</function></funcdef> | |
83 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
84 | <paramdef>char **<parameter>class</parameter></paramdef> | |
85 | </funcprototype> | |
86 | ||
87 | <funcprototype> | |
88 | <funcdef>int <function>sd_session_get_desktop</function></funcdef> | |
89 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
90 | <paramdef>char **<parameter>desktop</parameter></paramdef> | |
91 | </funcprototype> | |
92 | ||
93 | <funcprototype> | |
94 | <funcdef>int <function>sd_session_get_display</function></funcdef> | |
95 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
96 | <paramdef>char **<parameter>display</parameter></paramdef> | |
97 | </funcprototype> | |
98 | ||
99 | <funcprototype> | |
100 | <funcdef>int <function>sd_session_get_remote_host</function></funcdef> | |
101 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
102 | <paramdef>char **<parameter>remote_host</parameter></paramdef> | |
103 | </funcprototype> | |
104 | ||
105 | <funcprototype> | |
106 | <funcdef>int <function>sd_session_get_remote_user</function></funcdef> | |
107 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
108 | <paramdef>char **<parameter>remote_user</parameter></paramdef> | |
109 | </funcprototype> | |
110 | ||
111 | <funcprototype> | |
112 | <funcdef>int <function>sd_session_get_tty</function></funcdef> | |
113 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
114 | <paramdef>char **<parameter>tty</parameter></paramdef> | |
115 | </funcprototype> | |
116 | ||
117 | <funcprototype> | |
118 | <funcdef>int <function>sd_session_get_vt</function></funcdef> | |
119 | <paramdef>const char *<parameter>session</parameter></paramdef> | |
120 | <paramdef>unsigned int *<parameter>vt</parameter></paramdef> | |
121 | </funcprototype> | |
122 | </funcsynopsis> | |
123 | </refsynopsisdiv> | |
124 | ||
125 | <refsect1> | |
126 | <title>Description</title> | |
127 | ||
128 | <para><function>sd_session_is_active()</function> may be used to | |
129 | determine whether the session identified by the specified session | |
130 | identifier is currently active (i.e. currently in the foreground | |
131 | and available for user input) or not.</para> | |
132 | ||
133 | <para><function>sd_session_is_remote()</function> may be used to | |
134 | determine whether the session identified by the specified session | |
135 | identifier is a remote session (i.e. its remote host is known) or | |
136 | not.</para> | |
137 | ||
138 | <para><function>sd_session_get_state()</function> may be used to | |
139 | determine the state of the session identified by the specified | |
140 | session identifier. The following states are currently known: | |
141 | <literal>online</literal> (session logged in, but session not | |
142 | active, i.e. not in the foreground), <literal>active</literal> | |
143 | (session logged in and active, i.e. in the foreground), | |
144 | <literal>closing</literal> (session nominally logged out, but some | |
145 | processes belonging to it are still around). In the future | |
146 | additional states might be defined, client code should be written | |
147 | to be robust in regards to additional state strings being | |
148 | returned. This function is a more generic version of | |
149 | <function>sd_session_is_active()</function>. The returned string | |
150 | needs to be freed with the libc | |
151 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
152 | call after use.</para> | |
153 | ||
154 | <para><function>sd_session_get_uid()</function> may be used to | |
155 | determine the user identifier of the Unix user the session | |
156 | identified by the specified session identifier belongs to.</para> | |
157 | ||
158 | <para><function>sd_session_get_seat()</function> may be used to | |
159 | determine the seat identifier of the seat the session identified | |
160 | by the specified session identifier belongs to. Note that not all | |
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161 | sessions are attached to a seat, this call will fail (returning |
162 | <constant>-ENODATA</constant>) for them. The returned string needs | |
163 | to be freed with the libc | |
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164 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
165 | call after use.</para> | |
166 | ||
167 | <para><function>sd_session_get_service()</function> may be used to | |
168 | determine the name of the service (as passed during PAM session | |
169 | setup) that registered the session identified by the specified | |
170 | session identifier. The returned string needs to be freed with the | |
171 | libc | |
172 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
173 | call after use.</para> | |
174 | ||
175 | <para><function>sd_session_get_type()</function> may be used to | |
176 | determine the type of the session identified by the specified | |
177 | session identifier. The returned string is one of | |
178 | <literal>x11</literal>, <literal>wayland</literal>, | |
179 | <literal>tty</literal>, <literal>mir</literal> or | |
180 | <literal>unspecified</literal> and needs to be freed with the libc | |
181 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
182 | call after use.</para> | |
183 | ||
184 | <para><function>sd_session_get_class()</function> may be used to | |
185 | determine the class of the session identified by the specified | |
186 | session identifier. The returned string is one of | |
187 | <literal>user</literal>, <literal>greeter</literal>, | |
188 | <literal>lock-screen</literal>, or <literal>background</literal> | |
189 | and needs to be freed with the libc | |
190 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
191 | call after use.</para> | |
192 | ||
193 | <para><function>sd_session_get_desktop()</function> may be used to | |
194 | determine the brand of the desktop running on the session | |
195 | identified by the specified session identifier. This field can be | |
196 | set freely by desktop environments and does not follow any special | |
197 | formatting. However, desktops are strongly recommended to use the | |
198 | same identifiers and capitalization as for | |
199 | <varname>$XDG_CURRENT_DESKTOP</varname>, as defined by the <ulink | |
200 | url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop | |
201 | Entry Specification</ulink>. The returned string needs to be freed | |
202 | with the libc | |
203 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
204 | call after use.</para> | |
205 | ||
206 | <para><function>sd_session_get_display()</function> may be used to | |
207 | determine the X11 display of the session identified by the | |
208 | specified session identifier. The returned string needs to be | |
209 | freed with the libc | |
210 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
211 | call after use.</para> | |
212 | ||
213 | <para><function>sd_session_get_remote_host()</function> may be | |
214 | used to determine the remote hostname of the session identified by | |
215 | the specified session identifier. The returned string needs to be | |
216 | freed with the libc | |
217 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
218 | call after use.</para> | |
219 | ||
220 | <para><function>sd_session_get_remote_user()</function> may be | |
221 | used to determine the remote username of the session identified by | |
222 | the specified session identifier. The returned string needs to be | |
223 | freed with the libc | |
224 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
225 | call after use. Note that this value is rarely known to the | |
226 | system, and even then should not be relied on.</para> | |
227 | ||
228 | <para><function>sd_session_get_tty()</function> may be used to | |
229 | determine the TTY device of the session identified by the | |
230 | specified session identifier. The returned string needs to be | |
231 | freed with the libc | |
232 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
233 | call after use.</para> | |
234 | ||
235 | <para><function>sd_session_get_vt()</function> may be used to | |
236 | determine the VT number of the session identified by the specified | |
237 | session identifier. This function will return an error if the seat | |
238 | does not support VTs.</para> | |
239 | ||
240 | <para>If the <varname>session</varname> parameter of any of these | |
241 | functions is passed as <constant>NULL</constant>, the operation is | |
242 | executed for the session the calling process is a member of, if | |
243 | there is any.</para> | |
244 | </refsect1> | |
245 | ||
246 | <refsect1> | |
247 | <title>Return Value</title> | |
248 | ||
249 | <para>If the test succeeds, | |
250 | <function>sd_session_is_active()</function> and | |
251 | <function>sd_session_is_remote()</function> return a | |
252 | positive integer; if it fails, 0. On success, | |
253 | <function>sd_session_get_state()</function>, | |
254 | <function>sd_session_get_uid()</function>, | |
255 | <function>sd_session_get_seat()</function>, | |
256 | <function>sd_session_get_service()</function>, | |
257 | <function>sd_session_get_type()</function>, | |
258 | <function>sd_session_get_class()</function>, | |
259 | <function>sd_session_get_display()</function>, | |
260 | <function>sd_session_get_remote_user()</function>, | |
261 | <function>sd_session_get_remote_host()</function> and | |
262 | <function>sd_session_get_tty()</function> return 0 or | |
263 | a positive integer. On failure, these calls return a | |
264 | negative errno-style error code.</para> | |
798d3a52 | 265 | |
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266 | <refsect2> |
267 | <title>Errors</title> | |
707b66c6 | 268 | |
b1de39de | 269 | <para>Returned errors may indicate the following problems:</para> |
707b66c6 | 270 | |
b1de39de | 271 | <variablelist> |
707b66c6 | 272 | |
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273 | <varlistentry> |
274 | <term><constant>-ENXIO</constant></term> | |
707b66c6 | 275 | |
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276 | <listitem><para>The specified session does not exist.</para> |
277 | </listitem> | |
278 | </varlistentry> | |
707b66c6 | 279 | |
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280 | <varlistentry> |
281 | <term><constant>-ENODATA</constant></term> | |
707b66c6 | 282 | |
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283 | <listitem><para>The given field is not specified for the described session.</para> |
284 | </listitem> | |
285 | </varlistentry> | |
707b66c6 | 286 | |
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287 | <varlistentry> |
288 | <term><constant>-EINVAL</constant></term> | |
707b66c6 | 289 | |
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290 | <listitem><para>An input parameter was invalid (out of range, or <constant>NULL</constant>, where |
291 | that is not accepted).</para></listitem> | |
292 | </varlistentry> | |
707b66c6 | 293 | |
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294 | <varlistentry> |
295 | <term><constant>-ENOMEM</constant></term> | |
707b66c6 | 296 | |
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297 | <listitem><para>Memory allocation failed.</para></listitem> |
298 | </varlistentry> | |
299 | </variablelist> | |
300 | </refsect2> | |
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301 | </refsect1> |
302 | ||
7d6b2723 | 303 | <xi:include href="libsystemd-pkgconfig.xml" /> |
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304 | |
305 | <refsect1> | |
306 | <title>See Also</title> | |
307 | ||
308 | <para> | |
309 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
310 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
311 | <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
312 | </para> | |
313 | </refsect1> | |
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314 | |
315 | </refentry> |