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b1de39dec8
Logically, this is better, because we're describing a subset of possible return values. Visually this also looks quite good because groff renders refsect2 much less prominently. Also rewrap things, add <constant> in various places, fix some typos.
191 lines
8.0 KiB
XML
191 lines
8.0 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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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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</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 0 or a positive integer. If the test
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succeeds, <function>sd_uid_is_on_seat()</function> returns a positive integer; if it fails, 0.
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<function>sd_uid_get_sessions()</function> and <function>sd_uid_get_seats()</function> return the number
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of entries in the returned arrays. <function>sd_uid_get_display()</function> returns a non-negative code
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on success. On failure, these calls return a negative errno-style error code.</para>
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<refsect2>
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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 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, or NULL, where that is not
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accepted). This is also returned if the passed user ID is <constant>0xFFFF</constant> or
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<constant>0xFFFFFFFF</constant>, which are 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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</refsect2>
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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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