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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
205 lines
8.4 KiB
XML
205 lines
8.4 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" conditional='HAVE_PAM'>
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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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<refname>sd_uid_get_display</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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<funcprototype>
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<funcdef>int <function>sd_uid_get_display</function></funcdef>
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<paramdef>uid_t <parameter>uid</parameter></paramdef>
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<paramdef>char **<parameter>session</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 used to
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determine the login state of a specific Unix user identifier. The
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following states are currently known: <literal>offline</literal>
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(user not logged in at all), <literal>lingering</literal> (user
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not logged in, but some user services running),
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<literal>online</literal> (user logged in, but not active, i.e.
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has no session in the foreground), <literal>active</literal> (user
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logged in, and has at least one active session, i.e. one session
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in the foreground), <literal>closing</literal> (user not logged
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in, and not lingering, but some processes are still around). In
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the future additional states might be defined, client code should
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be written to be robust in regards to additional state strings
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being returned. The returned string needs to be freed with the
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libc
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<citerefentry project='man-pages'><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 used to
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determine whether a specific user is logged in or active on a
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specific seat. Accepts a Unix user identifier and a seat
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identifier string as parameters. The
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<parameter>require_active</parameter> parameter is a boolean
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value. If non-zero (true), this function will test if the user is
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active (i.e. has a session that is in the foreground and accepting
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user input) on the specified seat, otherwise (false) only if the
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user is logged in (and possibly inactive) on the specified
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seat.</para>
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<para><function>sd_uid_get_sessions()</function> may be used to
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determine the current sessions of the specified user. Accepts a
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Unix user identifier as parameter. The
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<parameter>require_active</parameter> parameter controls whether
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the returned list shall consist of only those sessions where the
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user is currently active (> 0), where the user is currently
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online but possibly inactive (= 0), or logged in at all but
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possibly closing the session (< 0). The call returns a
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<constant>NULL</constant> terminated string array of session
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identifiers in <parameter>sessions</parameter> which needs to be
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freed by the caller with the libc
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use, including all the strings referenced. If the
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string array parameter is passed as <constant>NULL</constant>, the
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array will not be filled in, but the return code still indicates
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the number of current sessions. Note that instead of an empty
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array <constant>NULL</constant> may be returned and should be
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considered equivalent to an empty array.</para>
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<para>Similarly, <function>sd_uid_get_seats()</function> may be
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used to determine the list of seats on which the user currently
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has sessions. Similar semantics apply, however note that the user
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may have multiple sessions on the same seat as well as sessions
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with no attached seat and hence the number of entries in the
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returned array may differ from the one returned by
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<function>sd_uid_get_sessions()</function>.</para>
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<para><function>sd_uid_get_display()</function> returns the name
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of the "primary" session of a user. If the user has graphical
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sessions, it will be the oldest graphical session. Otherwise, it
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will be the oldest open session.</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, <function>sd_uid_get_state()</function> returns
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0 or a positive integer. If the test succeeds,
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<function>sd_uid_is_on_seat()</function> returns a positive
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integer; if it fails, 0.
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<function>sd_uid_get_sessions()</function> and
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<function>sd_uid_get_seats()</function> return the number of
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entries in the returned arrays.
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<function>sd_uid_get_display()</function> returns a non-negative
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code on success. On failure, these calls return a negative
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errno-style error code.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>Functions described here are available as a shared library,
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and can be compiled and linked to using the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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entry.</para>
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</refsect1>
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<refsect1>
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<title>History</title>
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<para><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> functions were added in
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systemd-31.</para>
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<para><function>sd_uid_get_display()</function> was added in
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systemd-213.</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>3</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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