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diff --git a/man/sd_uid_get_state.xml b/man/sd_uid_get_state.xml new file mode 100644 index 0000000..087a2d5 --- /dev/null +++ b/man/sd_uid_get_state.xml @@ -0,0 +1,191 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> +<!-- SPDX-License-Identifier: LGPL-2.1-or-later --> + +<refentry id="sd_uid_get_state" conditional='HAVE_PAM' + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_uid_get_state</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_uid_get_state</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_uid_get_state</refname> + <refname>sd_uid_is_on_seat</refname> + <refname>sd_uid_get_sessions</refname> + <refname>sd_uid_get_seats</refname> + <refname>sd_uid_get_display</refname> + <refpurpose>Determine login state of a specific Unix user ID</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_uid_get_state</function></funcdef> + <paramdef>uid_t <parameter>uid</parameter></paramdef> + <paramdef>char **<parameter>state</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_uid_is_on_seat</function></funcdef> + <paramdef>uid_t <parameter>uid</parameter></paramdef> + <paramdef>int <parameter>require_active</parameter></paramdef> + <paramdef>const char *<parameter>seat</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_uid_get_sessions</function></funcdef> + <paramdef>uid_t <parameter>uid</parameter></paramdef> + <paramdef>int <parameter>require_active</parameter></paramdef> + <paramdef>char ***<parameter>sessions</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_uid_get_seats</function></funcdef> + <paramdef>uid_t <parameter>uid</parameter></paramdef> + <paramdef>int <parameter>require_active</parameter></paramdef> + <paramdef>char ***<parameter>seats</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_uid_get_display</function></funcdef> + <paramdef>uid_t <parameter>uid</parameter></paramdef> + <paramdef>char **<parameter>session</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_uid_get_state()</function> may be used to + determine the login state of a specific Unix user identifier. The + following states are currently known: <literal>offline</literal> + (user not logged in at all), <literal>lingering</literal> (user + not logged in, but some user services running), + <literal>online</literal> (user logged in, but not active, i.e. + has no session in the foreground), <literal>active</literal> (user + logged in, and has at least one active session, i.e. one session + in the foreground), <literal>closing</literal> (user not logged + in, and not lingering, but some processes are still around). In + the future additional states might be defined, client code should + be written to be robust in regards to additional state strings + being returned. The returned string needs to be freed with the + libc + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> + call after use.</para> + + <para><function>sd_uid_is_on_seat()</function> may be used to + determine whether a specific user is logged in or active on a + specific seat. Accepts a Unix user identifier and a seat + identifier string as parameters. The + <parameter>require_active</parameter> parameter is a boolean + value. If non-zero (true), this function will test if the user is + active (i.e. has a session that is in the foreground and accepting + user input) on the specified seat, otherwise (false) only if the + user is logged in (and possibly inactive) on the specified + seat.</para> + + <para><function>sd_uid_get_sessions()</function> may be used to + determine the current sessions of the specified user. Accepts a + Unix user identifier as parameter. The + <parameter>require_active</parameter> parameter controls whether + the returned list shall consist of only those sessions where the + user is currently active (> 0), where the user is currently + online but possibly inactive (= 0), or logged in but + possibly closing the session (< 0). The call returns a + <constant>NULL</constant> terminated string array of session + identifiers in <parameter>sessions</parameter> which needs to be + freed by the caller with the libc + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> + call after use, including all the strings referenced. If the + string array parameter is passed as <constant>NULL</constant>, the + array will not be filled in, but the return code still indicates + the number of current sessions. Note that instead of an empty + array <constant>NULL</constant> may be returned and should be + considered equivalent to an empty array.</para> + + <para>Similarly, <function>sd_uid_get_seats()</function> may be + used to determine the list of seats on which the user currently + has sessions. Similar semantics apply, however note that the user + may have multiple sessions on the same seat as well as sessions + with no attached seat and hence the number of entries in the + returned array may differ from the one returned by + <function>sd_uid_get_sessions()</function>.</para> + + <para><function>sd_uid_get_display()</function> returns the name + of the "primary" session of a user. If the user has graphical + sessions, it will be the oldest graphical session. Otherwise, it + will be the oldest open session.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>sd_uid_get_state()</function> returns 0 or a positive integer. If the test + succeeds, <function>sd_uid_is_on_seat()</function> returns a positive integer; if it fails, 0. + <function>sd_uid_get_sessions()</function> and <function>sd_uid_get_seats()</function> return the number + of entries in the returned arrays. <function>sd_uid_get_display()</function> returns a non-negative code + on success. On failure, these calls return a negative errno-style error code.</para> + + <refsect2> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + + <varlistentry> + <term><constant>-ENODATA</constant></term> + + <listitem><para>The given field is not specified for the described user.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENXIO</constant></term> + + <listitem><para>The specified seat is unknown.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>An input parameter was invalid (out of range, or <constant>NULL</constant>, + where that is not accepted). This is also returned if the passed user ID is + <constant>0xFFFF</constant> or <constant>0xFFFFFFFF</constant>, which are undefined on Linux. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENOMEM</constant></term> + + <listitem><para>Memory allocation failed.</para></listitem> + </varlistentry> + </variablelist> + </refsect2> + </refsect1> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |