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5aded36978
It is annoying when we have dead links on fd.o. Add project='man-pages|die-net|archlinux' to <citerefentry>-ies. In generated html, add external links to http://man7.org/linux/man-pages/man, http://linux.die.net/man/, https://www.archlinux.org/. By default, pages in sections 2 and 4 go to man7, since Michael Kerrisk is the autorative source on kernel related stuff. The rest of links goes to linux.die.net, because they have the manpages. Except for the pacman stuff, since it seems to be only available from archlinux.org. Poor gummiboot gets no link, because gummitboot(8) ain't to be found on the net. According to common wisdom, that would mean that it does not exist. But I have seen Kay using it, so I know it does, and deserves to be found. Can somebody be nice and put it up somewhere?
216 lines
11 KiB
XML
216 lines
11 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
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used to determine the login state of a specific Unix
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user identifier. The following states are currently
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known: <literal>offline</literal> (user not logged in
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at all), <literal>lingering</literal> (user not logged
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in, but some user services running),
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<literal>online</literal> (user logged in, but not
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active, i.e. has no session in the foreground),
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<literal>active</literal> (user logged in, and has at
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least one active session, i.e. one session in the
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foreground), <literal>closing</literal> (user not
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logged in, and not lingering, but some processes are
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still around). In the future additional states might
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be defined, client code should be written to be robust
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in regards to additional state strings being
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returned. The returned string needs to be freed with
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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_uid_is_on_seat()</function> may be
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used to determine whether a specific user is logged in
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or active on a specific seat. Accepts a Unix user
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identifier and a seat identifier string as
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parameters. The <parameter>require_active</parameter>
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parameter is a boolean value. If non-zero (true), this
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function will test if the user is active (i.e. has a
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session that is in the foreground and accepting user
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input) on the specified seat, otherwise (false) only
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if the user is logged in (and possibly inactive) on
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the specified seat.</para>
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<para><function>sd_uid_get_sessions()</function> may
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be used to determine the current sessions of the
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specified user. Accepts a Unix user identifier as
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parameter. The <parameter>require_active</parameter>
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parameter controls whether the returned list shall
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consist of only those sessions where the user is
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currently active (> 0), where the user is currently
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online but possibly inactive (= 0), or
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logged in at all but possibly closing the session (< 0). The call returns a
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<constant>NULL</constant> terminated string array of session identifiers in
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<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
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referenced. If the string array parameter is passed as
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<constant>NULL</constant>, the array will not be filled in, but the return
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code still indicates the number of current
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sessions. Note that instead of an empty array <constant>NULL</constant> may
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be returned and should be considered equivalent to an
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empty array.</para>
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<para>Similarly, <function>sd_uid_get_seats()</function>
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may be used to determine the list of seats on which
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the user currently has sessions. Similar semantics
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apply, however note that the user may have
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multiple sessions on the same seat as well as sessions
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with no attached seat and hence the number of entries
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in the returned array may differ from the one returned
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by <function>sd_uid_get_sessions()</function>.</para>
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<para><function>sd_uid_get_display()</function>
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returns the name of the "primary" session of a user.
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If the user has graphical sessions, it will be the
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oldest graphical session. Otherwise, it will be the
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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,
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<function>sd_uid_get_state()</function> returns 0 or a
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positive integer. If the test succeeds,
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<function>sd_uid_is_on_seat()</function> returns a
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positive integer; if it fails,
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0. <function>sd_uid_get_sessions()</function> and
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<function>sd_uid_get_seats()</function> return the
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number of entries in the returned arrays.
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<function>sd_uid_get_display()</function> returns
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a non-negative code on success. On failure,
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these calls return a negative errno-style error
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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
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shared library, and can be compiled and linked to
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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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<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>,
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and <function>sd_uid_get_seats()</function> functions
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were added in systemd-31.
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<para><function>sd_uid_get_display()</function> was
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added in 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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