<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
-<refentry id="sd-login">
-
- <refentryinfo>
- <title>sd-login</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd-login</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd-login</refname>
- <refpurpose>APIs for
- tracking logins</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
- </funcsynopsis>
-
- <cmdsynopsis>
- <command>pkg-config --cflags --libs libsystemd-login</command>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>sd-login.h</filename> provides APIs to
- introspect and monitor seat, login session and user
- status information on the local system. </para>
-
- <para>See <ulink
- url="http://www.freedesktop.org/wiki/Software/systemd/multiseat">Multi-Seat
- on Linux</ulink> for an introduction into multi-seat
- support on Linux, the background for this set of APIs.</para>
-
- <para>Note that these APIs only allow purely passive access
- and monitoring of seats, sessions and users. To
- actively make changes to the seat configuration,
- terminate login sessions, or switch session on a seat
- you need to utilize the D-Bus API of
- systemd-logind, instead.</para>
-
- <para>These functions synchronously access data in
- <filename>/proc</filename>,
- <filename>/sys/fs/cgroup</filename> and
- <filename>/run</filename>. All of these are virtual
- file systems, hence the runtime cost of the accesses
- is relatively cheap.</para>
-
- <para>It is possible (and often a very good choice) to
- mix calls to the synchronous interface of
- <filename>sd-login.h</filename> with the asynchronous
- D-Bus interface of systemd-logind. However, if this is
- done you need to think a bit about possible races
- since the stream of events from D-Bus and from
- <filename>sd-login.h</filename> interfaces such as the
- login monitor are asynchronous and not ordered against
- each other.</para>
-
- <para>If the functions return string arrays, these are
- generally NULL terminated and need to be freed by the
- caller with the libc
- <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- call after use, including the strings referenced
- therein. Similar, individual strings returned need to
- be freed, as well.</para>
-
- <para>As a special exception, instead of an empty
- string array NULL may be returned, which should be
- treated equivalent to an empty string array.</para>
-
- <para>See
- <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- for more information about the functions
- implemented.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>These APIs are implemented as shared library,
- which can be compiled and linked to with the
- <literal>libsystemd-login</literal>
- <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- file.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
+<refentry id="sd-login" conditional='HAVE_PAM'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd-login</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd-login</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd-login</refname>
+ <refpurpose>APIs for
+ tracking logins</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
+ </funcsynopsis>
+
+ <cmdsynopsis>
+ <command>pkg-config --cflags --libs libsystemd</command>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>sd-login.h</filename> provides APIs to introspect
+ and monitor seat, login session and user status information on the
+ local system. </para>
+
+ <para>See <ulink
+ url="http://www.freedesktop.org/wiki/Software/systemd/multiseat">Multi-Seat
+ on Linux</ulink> for an introduction into multi-seat support on
+ Linux, the background for this set of APIs.</para>
+
+ <para>Note that these APIs only allow purely passive access and
+ monitoring of seats, sessions and users. To actively make changes
+ to the seat configuration, terminate login sessions, or switch
+ session on a seat you need to utilize the D-Bus API of
+ systemd-logind, instead.</para>
+
+ <para>These functions synchronously access data in
+ <filename>/proc</filename>, <filename>/sys/fs/cgroup</filename>
+ and <filename>/run</filename>. All of these are virtual file
+ systems, hence the runtime cost of the accesses is relatively
+ cheap.</para>
+
+ <para>It is possible (and often a very good choice) to mix calls
+ to the synchronous interface of <filename>sd-login.h</filename>
+ with the asynchronous D-Bus interface of systemd-logind. However,
+ if this is done you need to think a bit about possible races since
+ the stream of events from D-Bus and from
+ <filename>sd-login.h</filename> interfaces such as the login
+ monitor are asynchronous and not ordered against each
+ other.</para>
+
+ <para>If the functions return string arrays, these are generally
+ <constant>NULL</constant> terminated and need to be freed by the
+ caller with the libc
+ <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use, including the strings referenced therein.
+ Similarly, individual strings returned need to be freed, as
+ well.</para>
+
+ <para>As a special exception, instead of an empty string array
+ <constant>NULL</constant> may be returned, which should be treated
+ equivalent to an empty string array.</para>
+
+ <para>See
+ <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more information about the functions
+ implemented.</para>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
</refentry>
~ianmdlvl / elogind.git / blobdiff