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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_pid_get_session" conditional='HAVE_PAM'> |
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25 | |
26 | <refentryinfo> | |
27 | <title>sd_pid_get_session</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_pid_get_session</refentrytitle> | |
42 | <manvolnum>3</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>sd_pid_get_session</refname> | |
94fb446e | 47 | <refname>sd_pid_get_unit</refname> |
97e13058 | 48 | <refname>sd_pid_get_user_unit</refname> |
0b3b020a | 49 | <refname>sd_pid_get_owner_uid</refname> |
7027ff61 | 50 | <refname>sd_pid_get_machine_name</refname> |
60211b35 | 51 | <refname>sd_pid_get_slice</refname> |
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52 | <refname>sd_peer_get_session</refname> |
53 | <refname>sd_peer_get_unit</refname> | |
54 | <refname>sd_peer_get_user_unit</refname> | |
55 | <refname>sd_peer_get_owner_uid</refname> | |
56 | <refname>sd_peer_get_machine_name</refname> | |
57 | <refname>sd_peer_get_slice</refname> | |
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58 | <refpurpose>Determine session, service, owner of a |
59 | session, container/VM or slice of a specific | |
bf34ab14 | 60 | PID or socket peer</refpurpose> |
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61 | </refnamediv> |
62 | ||
63 | <refsynopsisdiv> | |
64 | <funcsynopsis> | |
65 | <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> | |
66 | ||
67 | <funcprototype> | |
68 | <funcdef>int <function>sd_pid_get_session</function></funcdef> | |
69 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
3b3d7d06 | 70 | <paramdef>char **<parameter>session</parameter></paramdef> |
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71 | </funcprototype> |
72 | ||
9847946e | 73 | <funcprototype> |
94fb446e | 74 | <funcdef>int <function>sd_pid_get_unit</function></funcdef> |
9847946e | 75 | <paramdef>pid_t <parameter>pid</parameter></paramdef> |
3b3d7d06 | 76 | <paramdef>char **<parameter>unit</parameter></paramdef> |
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77 | </funcprototype> |
78 | ||
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79 | <funcprototype> |
80 | <funcdef>int <function>sd_pid_get_user_unit</function></funcdef> | |
81 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
3b3d7d06 | 82 | <paramdef>char **<parameter>unit</parameter></paramdef> |
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83 | </funcprototype> |
84 | ||
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85 | <funcprototype> |
86 | <funcdef>int <function>sd_pid_get_owner_uid</function></funcdef> | |
87 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
3b3d7d06 | 88 | <paramdef>uid_t *<parameter>uid</parameter></paramdef> |
0b3b020a | 89 | </funcprototype> |
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90 | |
91 | <funcprototype> | |
92 | <funcdef>int <function>sd_pid_get_machine_name</function></funcdef> | |
93 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
3b3d7d06 | 94 | <paramdef>char **<parameter>name</parameter></paramdef> |
7027ff61 | 95 | </funcprototype> |
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96 | |
97 | <funcprototype> | |
98 | <funcdef>int <function>sd_pid_get_slice</function></funcdef> | |
99 | <paramdef>pid_t <parameter>pid</parameter></paramdef> | |
3b3d7d06 | 100 | <paramdef>char **<parameter>slice</parameter></paramdef> |
60211b35 | 101 | </funcprototype> |
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102 | |
103 | <funcprototype> | |
104 | <funcdef>int <function>sd_peer_get_session</function></funcdef> | |
105 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 106 | <paramdef>char **<parameter>session</parameter></paramdef> |
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107 | </funcprototype> |
108 | ||
109 | <funcprototype> | |
110 | <funcdef>int <function>sd_peer_get_unit</function></funcdef> | |
111 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 112 | <paramdef>char **<parameter>unit</parameter></paramdef> |
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113 | </funcprototype> |
114 | ||
115 | <funcprototype> | |
116 | <funcdef>int <function>sd_peer_get_user_unit</function></funcdef> | |
117 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 118 | <paramdef>char **<parameter>unit</parameter></paramdef> |
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119 | </funcprototype> |
120 | ||
121 | <funcprototype> | |
122 | <funcdef>int <function>sd_peer_get_owner_uid</function></funcdef> | |
123 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 124 | <paramdef>uid_t *<parameter>uid</parameter></paramdef> |
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125 | </funcprototype> |
126 | ||
127 | <funcprototype> | |
128 | <funcdef>int <function>sd_peer_get_machine_name</function></funcdef> | |
129 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 130 | <paramdef>char **<parameter>name</parameter></paramdef> |
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131 | </funcprototype> |
132 | ||
133 | <funcprototype> | |
134 | <funcdef>int <function>sd_peer_get_slice</function></funcdef> | |
135 | <paramdef>int <parameter>fd</parameter></paramdef> | |
3b3d7d06 | 136 | <paramdef>char **<parameter>slice</parameter></paramdef> |
bf34ab14 | 137 | </funcprototype> |
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138 | </funcsynopsis> |
139 | </refsynopsisdiv> | |
140 | ||
141 | <refsect1> | |
142 | <title>Description</title> | |
143 | ||
144 | <para><function>sd_pid_get_session()</function> may be | |
145 | used to determine the login session identifier of a | |
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146 | process identified by the specified process |
147 | identifier. The session identifier is a short string, | |
148 | suitable for usage in file system paths. Note that not | |
149 | all processes are part of a login session (e.g. system | |
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150 | service processes, user processes that are shared |
151 | between multiple sessions of the same user, or kernel | |
152 | threads). For processes not being part of a login | |
153 | session this function will fail. The returned string | |
154 | needs to be freed with the libc | |
5aded369 | 155 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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156 | call after use.</para> |
157 | ||
94fb446e | 158 | <para><function>sd_pid_get_unit()</function> may be |
97e13058 | 159 | used to determine the systemd system unit (i.e. system |
94fb446e | 160 | service) identifier of a process identified by the |
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161 | specified PID. The unit name is a short string, |
162 | suitable for usage in file system paths. Note that not | |
163 | all processes are part of a system unit/service | |
94fb446e | 164 | (e.g. user processes, or kernel threads). For |
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165 | processes not being part of a systemd system unit this |
166 | function will fail. (More specifically: this call will | |
167 | not work for processes that are part of user units, | |
168 | use <function>sd_pid_get_user_unit()</function> for | |
7027ff61 | 169 | that.) The returned string needs to be freed with the |
97e13058 | 170 | libc |
5aded369 | 171 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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172 | call after use.</para> |
173 | ||
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174 | <para><function>sd_pid_get_user_unit()</function> may |
175 | be used to determine the systemd user unit (i.e. user | |
176 | service) identifier of a process identified by the | |
177 | specified PID. This is similar to | |
178 | <function>sd_pid_get_unit()</function> but applies to | |
179 | user units instead of system units.</para> | |
180 | ||
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181 | <para><function>sd_pid_get_owner_uid()</function> may |
182 | be used to determine the Unix user identifier of the | |
183 | owner of the session of a process identified the | |
184 | specified PID. Note that this function will succeed | |
185 | for user processes which are shared between multiple | |
186 | login sessions of the same user, where | |
187 | <function>sd_pid_get_session()</function> will | |
188 | fail. For processes not being part of a login session | |
189 | and not being a shared process of a user this function | |
190 | will fail.</para> | |
50b1678a | 191 | |
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192 | <para><function>sd_pid_get_machine_name()</function> |
193 | may be used to determine the name of the VM or | |
194 | container is a member of. The machine name is a short | |
195 | string, suitable for usage in file system paths. The | |
196 | returned string needs to be freed with the libc | |
5aded369 | 197 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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198 | call after use.</para> |
199 | ||
200 | <para><function>sd_pid_get_slice()</function> may be | |
201 | used to determine the slice unit the process is a | |
202 | member of. See | |
203 | <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
204 | for details about slices. The returned string needs to | |
205 | be freed with the libc | |
5aded369 | 206 | <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> |
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207 | call after use.</para> |
208 | ||
74d00578 | 209 | <para>If the <varname>pid</varname> parameter of any |
79640424 | 210 | of these functions is passed as 0, the operation is |
50b1678a | 211 | executed for the calling process.</para> |
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212 | |
213 | <para>The <function>sd_peer_get_session()</function>, | |
214 | <function>sd_peer_get_unit()</function>, | |
215 | <function>sd_peer_get_user_unit()</function>, | |
216 | <function>sd_peer_get_owner_uid()</function>, | |
217 | <function>sd_peer_get_machine_name()</function> and | |
218 | <function>sd_peer_get_slice()</function> calls operate | |
219 | similar to their PID counterparts, but operate on a | |
220 | connected AF_UNIX socket and retrieve information | |
221 | about the connected peer process.</para> | |
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222 | </refsect1> |
223 | ||
224 | <refsect1> | |
225 | <title>Return Value</title> | |
226 | ||
79640424 | 227 | <para>On success, these calls return 0 or a positive |
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228 | integer. On failure, these calls return a negative |
229 | errno-style error code.</para> | |
230 | </refsect1> | |
231 | ||
232 | <refsect1> | |
233 | <title>Notes</title> | |
234 | ||
9847946e | 235 | <para>The <function>sd_pid_get_session()</function>, |
97e13058 | 236 | <function>sd_pid_get_unit()</function>, |
7027ff61 | 237 | <function>sd_pid_get_user_unit()</function>, |
60211b35 | 238 | <function>sd_pid_get_owner_uid()</function>, |
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239 | <function>sd_pid_get_machine_name()</function>, |
240 | <function>sd_pid_get_slice()</function>, | |
241 | <function>sd_peer_get_session()</function>, | |
242 | <function>sd_peer_get_unit()</function>, | |
243 | <function>sd_peer_get_user_unit()</function>, | |
244 | <function>sd_peer_get_owner_uid()</function>, | |
245 | <function>sd_peer_get_machine_name()</function> and | |
246 | <function>sd_peer_get_slice()</function> interfaces are | |
247 | available as a shared library, which can be compiled | |
248 | and linked to with the | |
5aded369 | 249 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
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250 | file.</para> |
251 | ||
252 | <para>Note that the login session identifier as | |
253 | returned by <function>sd_pid_get_session()</function> | |
254 | is completely unrelated to the process session | |
255 | identifier as returned by | |
256 | <citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>.</para> | |
257 | </refsect1> | |
258 | ||
259 | <refsect1> | |
260 | <title>See Also</title> | |
261 | ||
262 | <para> | |
263 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
cb07866b | 264 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
0b3b020a | 265 | <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>, |
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266 | <citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>, |
267 | <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
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268 | </para> |
269 | </refsect1> | |
270 | ||
271 | </refentry> |