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aa3b40c3f9
sd_seat_get_sessions() would return 0 in the 'n_uids' (now 'ret_n_uids') output parameter when 'uid' (now 'ret_uids') was passed as NULL. While at it, drop FOREACH_WORD() use. Also use any whitespace as separator. In practice this shouldn't matter, since logind always uses spaces, but it seems nicer to not specify this explicitly, and the default is more flexible.
163 lines
6.4 KiB
XML
163 lines
6.4 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_seat_get_active" 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_seat_get_active</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_seat_get_active</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_seat_get_active</refname>
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<refname>sd_seat_get_sessions</refname>
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<refname>sd_seat_can_tty</refname>
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<refname>sd_seat_can_graphical</refname>
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<refpurpose>Determine state of a specific seat</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_seat_get_active</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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<paramdef>char **<parameter>session</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_get_sessions</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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<paramdef>char ***<parameter>ret_sessions</parameter></paramdef>
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<paramdef>uid_t **<parameter>ret_uids</parameter></paramdef>
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<paramdef>unsigned int *<parameter>ret_n_uids</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_can_tty</function></funcdef>
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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_seat_can_graphical</function></funcdef>
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<paramdef>const char *<parameter>seat</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_seat_get_active()</function> may be used to
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determine which session is currently active on a seat, if there is
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any. Returns the session identifier and the user identifier of the
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Unix user the session is belonging to. Either the session or the
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user identifier parameter can be passed <constant>NULL</constant>,
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in case only one of the parameters shall be queried. The returned
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string needs to be freed 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.</para>
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<para><function>sd_seat_get_sessions()</function> may be used to determine all sessions on the specified
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seat. Returns two arrays, one (<constant>NULL</constant> terminated) with the session identifiers of the
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sessions and one with the user identifiers of the Unix users the sessions belong to. An additional
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parameter may be used to return the number of entries in the latter array. This value is the same as the
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return value if the return value is nonnegative. The output parameters may be passed as
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<constant>NULL</constant> in case these output values are not needed. The arrays and the strings
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referenced by them need to be freed with the libc <citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> call after
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use. Note that instead of an empty 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><function>sd_seat_can_tty()</function> may be used to
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determine whether a specific seat provides TTY functionality, i.e.
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is useful as a text console.</para>
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<para><function>sd_seat_can_graphical()</function> may be used to
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determine whether a specific seat provides graphics functionality,
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i.e. is useful as a graphics display.</para>
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<para>If the <varname>seat</varname> parameter of any of these
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functions is passed as <constant>NULL</constant>, the operation is
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executed for the seat of the session of the calling process, if
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there is any.</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_seat_get_active()</function> returns 0 or a positive integer. On success,
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<function>sd_seat_get_sessions()</function> returns the number of entries in the session identifier
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array. If the test succeeds,
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<function>sd_seat_can_tty</function> and <function>sd_seat_can_graphical</function> return a positive
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integer, if it fails 0. 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 seat.</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 <constant>NULL</constant>, where
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that is not accepted).</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>History</title>
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<para>In the past, <function>sd_seat_can_multi_session()</function> was used to check whether the seat
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supports multiple sessions. All seats support that now, so that function has been deprecated and always
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returns true.</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_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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