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7d6b27238f
The only difference is that functions are not individually listed by name, but that seems completely pointless, since all functions that are documented are always exported, so the generic text tells the user all she or he needs to know.
214 lines
8.2 KiB
XML
214 lines
8.2 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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-->
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<refentry id="sd_uid_get_state" conditional='HAVE_PAM'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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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>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ENODATA</constant></term>
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<listitem><para>The given field is not specified for the described
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user.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>The specified seat is unknown.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>An input parameter was invalid (out of range,
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or NULL, where that is not accepted). This is also returned if
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the passed user ID is 0xFFFF or 0xFFFFFFFF, which are
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undefined on Linux.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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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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