161 lines
7.4 KiB
XML
161 lines
7.4 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!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 2010 Lennart Poettering
|
|
|
|
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_pid_get_session">
|
|
|
|
<refentryinfo>
|
|
<title>sd_pid_get_session</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Lennart</firstname>
|
|
<surname>Poettering</surname>
|
|
<email>lennart@poettering.net</email>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_pid_get_session</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_pid_get_session</refname>
|
|
<refname>sd_pid_get_unit</refname>
|
|
<refname>sd_pid_get_owner_uid</refname>
|
|
<refpurpose>Determine session, service or owner of a session of a specific PID</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_pid_get_session</function></funcdef>
|
|
<paramdef>pid_t <parameter>pid</parameter></paramdef>
|
|
<paramdef>char** <parameter>session</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_pid_get_unit</function></funcdef>
|
|
<paramdef>pid_t <parameter>pid</parameter></paramdef>
|
|
<paramdef>char** <parameter>unit</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_pid_get_owner_uid</function></funcdef>
|
|
<paramdef>pid_t <parameter>pid</parameter></paramdef>
|
|
<paramdef>uid_t* <parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_pid_get_session()</function> may be
|
|
used to determine the login session identifier of a
|
|
process identified by the specified process
|
|
identifier. The session identifier is a short string,
|
|
suitable for usage in file system paths. Note that not
|
|
all processes are part of a login session (e.g. system
|
|
service processes, user processes that are shared
|
|
between multiple sessions of the same user, or kernel
|
|
threads). For processes not being part of a login
|
|
session this function will fail. The returned string
|
|
needs to be freed with the libc
|
|
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
call after use.</para>
|
|
|
|
<para><function>sd_pid_get_unit()</function> may be
|
|
used to determine the systemd unit (i.e. system
|
|
service) identifier of a process identified by the
|
|
specified process identifier. The unit name is a short
|
|
string, suitable for usage in file system paths. Note
|
|
that not all processes are part of a unit/service
|
|
(e.g. user processes, or kernel threads). For
|
|
processes not being part of a systemd unit/system
|
|
service this function will fail. The returned string
|
|
needs to be freed with the libc
|
|
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
call after use.</para>
|
|
|
|
<para><function>sd_pid_get_owner_uid()</function> may
|
|
be used to determine the Unix user identifier of the
|
|
owner of the session of a process identified the
|
|
specified PID. Note that this function will succeed
|
|
for user processes which are shared between multiple
|
|
login sessions of the same user, where
|
|
<function>sd_pid_get_session()</function> will
|
|
fail. For processes not being part of a login session
|
|
and not being a shared process of a user this function
|
|
will fail.</para>
|
|
|
|
<para>If the <literal>pid</literal> paramater of any
|
|
of these functions is passed as 0 the operation is
|
|
executed for the calling process.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success these calls return 0 or a positive
|
|
integer. On failure, these calls return a negative
|
|
errno-style error code.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Notes</title>
|
|
|
|
<para>The <function>sd_pid_get_session()</function>,
|
|
<function>sd_pid_get_pid()</function>, and
|
|
<function>sd_pid_get_owner_uid()</function> interfaces
|
|
are available as shared library, which can be compiled
|
|
and linked to with the
|
|
<literal>libsystemd-login</literal>
|
|
<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
file.</para>
|
|
|
|
<para>Note that the login session identifier as
|
|
returned by <function>sd_pid_get_session()</function>
|
|
is completely unrelated to the process session
|
|
identifier as returned by
|
|
<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|