1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
|
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="sd_bus_creds_new_from_pid" conditional="ENABLE_KDBUS">
<refentryinfo>
<title>sd_bus_creds_new_from_pid</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>A monkey with a typewriter</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_creds_new_from_pid</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_creds_new_from_pid</refname>
<refname>sd_bus_creds_get_mask</refname>
<refname>sd_bus_creds_ref</refname>
<refname>sd_bus_creds_unref</refname>
<refpurpose>Retrieve credentials object for the specified PID</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_bus_creds_new_from_pid</function></funcdef>
<paramdef>pid_t <parameter>pid</parameter></paramdef>
<paramdef>uint64_t <parameter>creds_mask</parameter></paramdef>
<paramdef>sd_bus_creds **<parameter>ret</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>uint64_t <function>sd_bus_creds_get_mask</function></funcdef>
<paramdef>const sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_creds *<function>sd_bus_creds_ref</function></funcdef>
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_creds *<function>sd_bus_creds_unref</function></funcdef>
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<para>
<constant>SD_BUS_CREDS_PID</constant>,
<constant>SD_BUS_CREDS_PID_STARTTIME</constant>,
<constant>SD_BUS_CREDS_TID</constant>,
<constant>SD_BUS_CREDS_UID</constant>,
<constant>SD_BUS_CREDS_GID</constant>,
<constant>SD_BUS_CREDS_COMM</constant>,
<constant>SD_BUS_CREDS_TID_COMM</constant>,
<constant>SD_BUS_CREDS_EXE</constant>,
<constant>SD_BUS_CREDS_CMDLINE</constant>,
<constant>SD_BUS_CREDS_CGROUP</constant>,
<constant>SD_BUS_CREDS_UNIT</constant>,
<constant>SD_BUS_CREDS_USER_UNIT</constant>,
<constant>SD_BUS_CREDS_SLICE</constant>,
<constant>SD_BUS_CREDS_SESSION</constant>,
<constant>SD_BUS_CREDS_OWNER_UID</constant>,
<constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>,
<constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>,
<constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>,
<constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>,
<constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>,
<constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>,
<constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>,
<constant>SD_BUS_CREDS_UNIQUE_NAME</constant>,
<constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>,
<constant>_SD_BUS_CREDS_ALL</constant>
</para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_bus_creds_new_from_pid()</function> creates a new
credentials object and fills it with information about the process
<parameter>pid</parameter>. This pointer to this object will
be stored in <parameter>ret</parameter> pointer.</para>
<para>The information that will be stored is determined by
<parameter>creds_mask</parameter>. It may contain a subset of ORed
constants <constant>SD_BUS_CREDS_PID</constant>,
<constant>SD_BUS_CREDS_PID_STARTTIME</constant>,
<constant>SD_BUS_CREDS_TID</constant>,
<constant>SD_BUS_CREDS_UID</constant>,
<constant>SD_BUS_CREDS_GID</constant>,
<constant>SD_BUS_CREDS_COMM</constant>,
<constant>SD_BUS_CREDS_TID_COMM</constant>,
<constant>SD_BUS_CREDS_EXE</constant>,
<constant>SD_BUS_CREDS_CMDLINE</constant>,
<constant>SD_BUS_CREDS_CGROUP</constant>,
<constant>SD_BUS_CREDS_UNIT</constant>,
<constant>SD_BUS_CREDS_USER_UNIT</constant>,
<constant>SD_BUS_CREDS_SLICE</constant>,
<constant>SD_BUS_CREDS_SESSION</constant>,
<constant>SD_BUS_CREDS_OWNER_UID</constant>,
<constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>,
<constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>,
<constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>,
<constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>,
<constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>,
<constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>,
<constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>,
<constant>SD_BUS_CREDS_UNIQUE_NAME</constant>,
<constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>,
or <constant>_SD_BUS_CREDS_ALL</constant> to indicate
all known fields.</para>
<para>Fields can be retrieved from the credentials object using
<citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
and other functions which correspond directly to the constants
listed above.</para>
<para>A mask of fields which were actually successfully set
(acquired from <filename>/proc</filename>, etc.) can be retrieved
with <function>sd_bus_creds_get_mask()</function>. If the
credentials object was created with
<function>sd_bus_creds_new_from_pid()</function>, this will be a
subset of fields requested in <parameter>creds_mask</parameter>.
</para>
<para><function>sd_bus_creds_ref</function> creates a new
reference to the credentials object <parameter>c</parameter>. This
object will not be destroyed until
<function>sd_bus_creds_unref</function> has been called as many
times plus once more. Once the reference count has dropped to zero,
<parameter>c</parameter> cannot be used anymore, so further
calls to <function>sd_bus_creds_ref(c)</function> or
<function>sd_bus_creds_unref(c)</function> are illegal.</para>
<para><function>sd_bus_creds_unref</function> destroys a reference
to <parameter>c</parameter>.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, <function>sd_bus_creds_new_from_pid()</function>
returns 0 or a positive integer. On failure, it returns a negative
errno-style error code.</para>
<para><function>sd_bus_creds_get_mask()</function> returns the
mask of successfully acquired fields.</para>
<para><function>sd_bus_creds_ref</function> always returns the
argument.</para>
<para><function>sd_bus_creds_unref</function> always returns
<constant>NULL</constant>.</para>
</refsect1>
<refsect1>
<title>Reference ownership</title>
<para>Function <function>sd_bus_creds_new_from_pid()</function>
creates a new object and the caller owns the sole reference. When
not needed anymore, this reference should be destroyed with
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Errors</title>
<para>Returned errors may indicate the following problems:</para>
<variablelist>
<varlistentry>
<term><constant>-ESRCH</constant></term>
<listitem><para>Specified <parameter>pid</parameter> could not
be found.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-EINVAL</constant></term>
<listitem><para>Specified parameter is invalid
(<constant>NULL</constant> in case of output
parameters).</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOMEM</constant></term>
<listitem><para>Memory allocation failed.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para><function>sd_bus_creds_new_from_pid()</function> is
available as a shared library, which can be compiled and linked to
with the
<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_pid_starttime</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_tid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_gid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_comm</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_tid_comm</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_exe</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_cmdline</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_cgroup</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_unit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_user_unit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_slice</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_effective_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_permitted_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_inheritable_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_bounding_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_selinux_context</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_audit_session_id</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_audit_login_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_unique_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_well_known_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
|