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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
186 lines
9.0 KiB
XML
186 lines
9.0 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_uid_get_state">
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<refentryinfo>
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<title>sd_uid_get_state</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_uid_get_state</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_uid_get_state</refname>
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<refname>sd_uid_is_on_seat</refname>
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<refname>sd_uid_get_sessions</refname>
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<refname>sd_uid_get_seats</refname>
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<refpurpose>Determine login state of a specific Unix user ID</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_uid_get_state</function></funcdef>
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<paramdef>uid_t <parameter>uid</parameter></paramdef>
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<paramdef>char** <parameter>state</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_uid_is_on_seat</function></funcdef>
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<paramdef>uid_t <parameter>uid</parameter></paramdef>
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<paramdef>int <parameter>require_active</parameter></paramdef>
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<paramdef>const char* <parameter>seat</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_uid_get_sessions</function></funcdef>
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<paramdef>uid_t <parameter>uid</parameter></paramdef>
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<paramdef>int <parameter>require_active</parameter></paramdef>
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<paramdef>char*** <parameter>sessions</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_uid_get_seats</function></funcdef>
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<paramdef>uid_t <parameter>uid</parameter></paramdef>
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<paramdef>int <parameter>require_active</parameter></paramdef>
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<paramdef>char*** <parameter>seats</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_uid_get_state()</function> may be
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used to determine the login state of a specific Unix
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user identifier. The following states are currently
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known: <literal>offline</literal> (user not logged in
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at all), <literal>lingering</literal> (user not logged
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in, but some user services running),
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<literal>online</literal> (user logged in, but not
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active), <literal>active</literal> (user logged in on
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an active seat). In the future additional states might
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be defined, client code should be written to be robust
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in regards to additional state strings being
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returned. The returned string needs to be freed with
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the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_uid_is_on_seat()</function> may be
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used to determine whether a specific user is logged in
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or active on a specific seat. Accepts a Unix user
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identifier and a seat identifier string as
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parameters. The <parameter>require_active</parameter>
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parameter is a boolean. If non-zero (true) this
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function will test if the user is active (i.e. has a
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session that is in the foreground and accepting user
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input) on the specified seat, otherwise (false) only
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if the user is logged in (and possibly inactive) on
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the specified seat.</para>
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<para><function>sd_uid_get_sessions()</function> may
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be used to determine the current sessions of the
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specified user. Acceptes a Unix user identifier as
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parameter. The <parameter>require_active</parameter>
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boolean parameter controls whether the returned list
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shall consist of only those sessions where the user is
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currently active (true) or where the user is currently
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logged in at all, possibly inactive (false). The call
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returns a NULL terminated string array of session
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identifiers in <parameter>sessions</parameter> which
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needs to be freed by the caller with the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use, including all the strings
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referenced. If the string array parameter is passed as
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NULL the array will not be filled in, but the return
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code still indicates the number of current
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sessions. Note that instead of an empty array NULL may
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be returned and should be considered equivalent to an
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empty array.</para>
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<para>Similar, <function>sd_uid_get_seats()</function>
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may be used to determine the list of seats on which
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the user currently has sessions. Similar semantics
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apply, however note that the user may have
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multiple sessions on the same seat as well as sessions
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with no attached seat and hence the number of entries
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in the returned array may differ from the one returned
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by <function>sd_uid_get_sessions()</function>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success
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<function>sd_uid_get_state()</function> returns 0 or a
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positive integer. If the test succeeds
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<function>sd_uid_is_on_seat()</function> returns a
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positive integer, if it fails
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0. <function>sd_uid_get_sessions()</function> and
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<function>sd_uid_get_seats()</function> return the
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number of entries in the returned arrays. On failure,
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these calls return a negative errno-style error
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code.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_uid_get_state()</function>,
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<function>sd_uid_is_on_seat()</function>,
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<function>sd_uid_get_sessions()</function>, and
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<function>sd_uid_get_seats()</function> interfaces are
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available as shared library, which can be compiled and
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linked to with the <literal>libsystemd-login</literal>
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<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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