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man: document systemd-user-sessions.service

This commit is contained in:
Lennart Poettering 2012-06-25 17:34:50 +02:00
parent 448eefeba9
commit a882169a16
5 changed files with 89 additions and 6 deletions
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7
Makefile.am
View File

@ -2944,7 +2944,8 @@ MANPAGES += \
man/sd_uid_get_state.3 \
man/sd_session_is_active.3 \
man/sd_seat_get_active.3 \
man/sd_get_seats.3
man/sd_get_seats.3 \
man/systemd-user-sessions.service.8
MANPAGES_ALIAS += \
man/systemd-logind.8 \
@ -2965,7 +2966,8 @@ MANPAGES_ALIAS += \
man/sd_seat_get_sessions.3 \
man/sd_seat_can_multi_session.3 \
man/sd_get_sessions.3 \
man/sd_get_uids.3
man/sd_get_uids.3 \
man/systemd-user-sessions.8
man/systemd-logind.8: man/systemd-logind.service.8
man/sd_login_monitor_unref.3: man/sd_login_monitor_new.3
@ -2986,6 +2988,7 @@ man/sd_seat_get_sessions.3: man/sd_seat_get_active.3
man/sd_seat_can_multi_session.3: man/sd_seat_get_active.3
man/sd_get_sessions.3: man/sd_get_seats.3
man/sd_get_uids.3: man/sd_get_seats.3
man/systemd-user-sessions.8: man/systemd-user-sessions.service.8
EXTRA_DIST += \
src/login/logind-gperf.gperf \

1
man/systemd-logind.service.xml
View File

@ -112,6 +112,7 @@
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>

77
man/systemd-user-sessions.service.xml Normal file
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@ -0,0 +1,77 @@
<?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">
<!--
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="systemd-user-sessions.service">
<refentryinfo>
<title>systemd-user-sessions.service</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>systemd-user-sessions.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-user-sessions.service</refname>
<refname>systemd-user-sessions</refname>
<refpurpose>Permit user logins after boot, prohibit user logins at shutdown.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-user-sessions.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-user-sessions</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-user-sessions.service</filename>
is a service that controls user logins. After basic
system initialization is complete it removes
<filename>/run/login</filename>, thus permitting
logins. Before system shutdown it creates
<filename>/run/nologin</filename>, thus prohibiting
further logins. At the same time it also kills all
user processes, so that system shutdown may proceed
without any remaining user processes around.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>pam_nologin</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>

7
src/login/user-sessions.c
View File

@ -69,17 +69,18 @@ int main(int argc, char*argv[]) {
int r, q;
char *cgroup_user_tree = NULL;
if ((r = write_one_line_file_atomic("/run/nologin", "System is going down.")) < 0)
r = write_one_line_file_atomic("/run/nologin", "System is going down.");
if (r < 0)
log_error("Failed to create /run/nologin: %s", strerror(-r));
if ((q = cg_get_user_path(&cgroup_user_tree)) < 0) {
q = cg_get_user_path(&cgroup_user_tree);
if (q < 0) {
log_error("Failed to determine use path: %s", strerror(-q));
goto finish;
}
q = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup_user_tree, true);
free(cgroup_user_tree);
if (q < 0) {
log_error("Failed to kill sessions: %s", strerror(-q));
goto finish;

3
units/systemd-user-sessions.service.in
View File

@ -7,7 +7,8 @@
[Unit]
Description=Permit User Sessions
After=local-fs.target remote-fs.target
Documentation=man:systemd-user-sessions.service(8)
After=remote-fs.target
[Service]
Type=oneshot