mirror of
https://github.com/systemd/systemd-stable.git
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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
323 lines
14 KiB
XML
323 lines
14 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_session_is_active" conditional='HAVE_PAM'>
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<refentryinfo>
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<title>sd_session_is_active</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_session_is_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_session_is_active</refname>
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<refname>sd_session_is_remote</refname>
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<refname>sd_session_get_state</refname>
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<refname>sd_session_get_uid</refname>
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<refname>sd_session_get_seat</refname>
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<refname>sd_session_get_service</refname>
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<refname>sd_session_get_type</refname>
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<refname>sd_session_get_class</refname>
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<refname>sd_session_get_desktop</refname>
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<refname>sd_session_get_display</refname>
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<refname>sd_session_get_tty</refname>
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<refname>sd_session_get_vt</refname>
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<refname>sd_session_get_remote_host</refname>
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<refname>sd_session_get_remote_user</refname>
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<refpurpose>Determine state of a specific session</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_session_is_active</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_is_remote</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_state</function></funcdef>
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<paramdef>const char *<parameter>session</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_session_get_uid</function></funcdef>
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<paramdef>const 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_session_get_seat</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>seat</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_service</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>service</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_type</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>type</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_class</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>class</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_desktop</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>desktop</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_display</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>display</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_remote_host</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>remote_host</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_remote_user</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>remote_user</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_tty</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>char **<parameter>tty</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_session_get_vt</function></funcdef>
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<paramdef>const char *<parameter>session</parameter></paramdef>
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<paramdef>unsigned int *<parameter>vt</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_session_is_active()</function> may be used to
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determine whether the session identified by the specified session
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identifier is currently active (i.e. currently in the foreground
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and available for user input) or not.</para>
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<para><function>sd_session_is_remote()</function> may be used to
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determine whether the session identified by the specified session
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identifier is a remote session (i.e. its remote host is known) or
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not.</para>
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<para><function>sd_session_get_state()</function> may be used to
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determine the state of the session identified by the specified
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session identifier. The following states are currently known:
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<literal>online</literal> (session logged in, but session not
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active, i.e. not in the foreground), <literal>active</literal>
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(session logged in and active, i.e. in the foreground),
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<literal>closing</literal> (session nominally logged out, but some
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processes belonging to it are still around). In the future
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additional states might be defined, client code should be written
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to be robust in regards to additional state strings being
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returned. This function is a more generic version of
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<function>sd_session_is_active()</function>. The returned string
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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_session_get_uid()</function> may be used to
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determine the user identifier of the Unix user the session
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identified by the specified session identifier belongs to.</para>
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<para><function>sd_session_get_seat()</function> may be used to
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determine the seat identifier of the seat the session identified
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by the specified session identifier belongs to. Note that not all
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sessions are attached to a seat, this call will fail for them. The
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returned 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_session_get_service()</function> may be used to
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determine the name of the service (as passed during PAM session
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setup) that registered the session identified by the specified
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session identifier. 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_session_get_type()</function> may be used to
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determine the type of the session identified by the specified
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session identifier. The returned string is one of
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<literal>x11</literal>, <literal>wayland</literal>,
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<literal>tty</literal>, <literal>mir</literal> or
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<literal>unspecified</literal> and 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_session_get_class()</function> may be used to
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determine the class of the session identified by the specified
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session identifier. The returned string is one of
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<literal>user</literal>, <literal>greeter</literal>,
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<literal>lock-screen</literal>, or <literal>background</literal>
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and 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_session_get_desktop()</function> may be used to
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determine the brand of the desktop running on the session
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identified by the specified session identifier. This field can be
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set freely by desktop environments and does not follow any special
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formatting. However, desktops are strongly recommended to use the
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same identifiers and capitalization as for
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<varname>$XDG_CURRENT_DESKTOP</varname>, as defined by the <ulink
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url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop
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Entry Specification</ulink>. The returned string needs to be freed
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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_session_get_display()</function> may be used to
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determine the X11 display of the session identified by the
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specified session identifier. The returned string needs to be
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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_session_get_remote_host()</function> may be
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used to determine the remote hostname of the session identified by
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the specified session identifier. The returned string needs to be
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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_session_get_remote_user()</function> may be
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used to determine the remote username of the session identified by
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the specified session identifier. The returned string needs to be
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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. Note that this value is rarely known to the
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system, and even then should not be relied on.</para>
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<para><function>sd_session_get_tty()</function> may be used to
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determine the TTY device of the session identified by the
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specified session identifier. The returned string needs to be
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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_session_get_vt()</function> may be used to
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determine the VT number of the session identified by the specified
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session identifier. This function will return an error if the seat
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does not support VTs.</para>
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<para>If the <varname>session</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 session the calling process is a member of, 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>If the test succeeds,
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<function>sd_session_is_active()</function> and
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<function>sd_session_is_remote()</function> return a
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positive integer; if it fails, 0. On success,
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<function>sd_session_get_state()</function>,
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<function>sd_session_get_uid()</function>,
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<function>sd_session_get_seat()</function>,
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<function>sd_session_get_service()</function>,
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<function>sd_session_get_type()</function>,
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<function>sd_session_get_class()</function>,
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<function>sd_session_get_display()</function>,
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<function>sd_session_get_remote_user()</function>,
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<function>sd_session_get_remote_host()</function> and
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<function>sd_session_get_tty()</function> return 0 or
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a positive integer. On failure, these calls return a
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negative errno-style error code.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_session_is_active()</function>,
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<function>sd_session_get_state()</function>,
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<function>sd_session_get_uid()</function>,
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<function>sd_session_get_seat()</function>,
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<function>sd_session_get_service()</function>,
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<function>sd_session_get_type()</function>,
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<function>sd_session_get_class()</function>,
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<function>sd_session_get_display()</function>,
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<function>sd_session_get_remote_host()</function>,
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<function>sd_session_get_remote_user()</function> and
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<function>sd_session_get_tty()</function>
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interfaces are available as a shared library, which can
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be compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</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_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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