mirror of
https://github.com/systemd/systemd.git
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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
350 lines
14 KiB
XML
350 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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 (returning
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<constant>-ENODATA</constant>) for them. The returned string needs
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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>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>-ENXIO</constant></term>
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<listitem><para>The specified session does not exist.</para>
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</listitem>
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</varlistentry>
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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
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session.</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,
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or NULL, where 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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</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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