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diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index ab59eb7..49086b7 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -112,7 +112,7 @@ check_tcp_LDADD = $(SSLOBJS)
112check_time_LDADD = $(NETLIBS) 112check_time_LDADD = $(NETLIBS)
113check_ntp_time_LDADD = $(NETLIBS) $(MATHLIBS) 113check_ntp_time_LDADD = $(NETLIBS) $(MATHLIBS)
114check_ups_LDADD = $(NETLIBS) 114check_ups_LDADD = $(NETLIBS)
115check_users_LDADD = $(BASEOBJS) $(WTSAPI32LIBS) 115check_users_LDADD = $(BASEOBJS) $(WTSAPI32LIBS) $(SYSTEMDLIBS)
116check_by_ssh_LDADD = $(NETLIBS) 116check_by_ssh_LDADD = $(NETLIBS)
117check_ide_smart_LDADD = $(BASEOBJS) 117check_ide_smart_LDADD = $(BASEOBJS)
118negate_LDADD = $(BASEOBJS) 118negate_LDADD = $(BASEOBJS)
diff --git a/plugins/check_users.c b/plugins/check_users.c
index f6f4b36..2a9ee98 100644
--- a/plugins/check_users.c
+++ b/plugins/check_users.c
@@ -1,33 +1,33 @@
1/***************************************************************************** 1/*****************************************************************************
2* 2*
3* Monitoring check_users plugin 3* Monitoring check_users plugin
4* 4*
5* License: GPL 5* License: GPL
6* Copyright (c) 2000-2012 Monitoring Plugins Development Team 6* Copyright (c) 2000-2012 Monitoring Plugins Development Team
7* 7*
8* Description: 8* Description:
9* 9*
10* This file contains the check_users plugin 10* This file contains the check_users plugin
11* 11*
12* This plugin checks the number of users currently logged in on the local 12* This plugin checks the number of users currently logged in on the local
13* system and generates an error if the number exceeds the thresholds 13* system and generates an error if the number exceeds the thresholds
14* specified. 14* specified.
15* 15*
16* 16*
17* This program is free software: you can redistribute it and/or modify 17* This program is free software: you can redistribute it and/or modify
18* it under the terms of the GNU General Public License as published by 18* it under the terms of the GNU General Public License as published by
19* the Free Software Foundation, either version 3 of the License, or 19* the Free Software Foundation, either version 3 of the License, or
20* (at your option) any later version. 20* (at your option) any later version.
21* 21*
22* This program is distributed in the hope that it will be useful, 22* This program is distributed in the hope that it will be useful,
23* but WITHOUT ANY WARRANTY; without even the implied warranty of 23* but WITHOUT ANY WARRANTY; without even the implied warranty of
24* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25* GNU General Public License for more details. 25* GNU General Public License for more details.
26* 26*
27* You should have received a copy of the GNU General Public License 27* You should have received a copy of the GNU General Public License
28* along with this program. If not, see <http://www.gnu.org/licenses/>. 28* along with this program. If not, see <http://www.gnu.org/licenses/>.
29* 29*
30* 30*
31*****************************************************************************/ 31*****************************************************************************/
32 32
33const char *progname = "check_users"; 33const char *progname = "check_users";
@@ -48,6 +48,11 @@ const char *email = "devel@monitoring-plugins.org";
48# include "popen.h" 48# include "popen.h"
49#endif 49#endif
50 50
51#ifdef HAVE_LIBSYSTEMD
52#include <systemd/sd-daemon.h>
53#include <systemd/sd-login.h>
54#endif
55
51#define possibly_set(a,b) ((a) == 0 ? (b) : 0) 56#define possibly_set(a,b) ((a) == 0 ? (b) : 0)
52 57
53int process_arguments (int, char **); 58int process_arguments (int, char **);
@@ -85,6 +90,11 @@ main (int argc, char **argv)
85 90
86 users = 0; 91 users = 0;
87 92
93#ifdef HAVE_LIBSYSTEMD
94 if (sd_booted () > 0)
95 users = sd_get_sessions (NULL);
96 else {
97#endif
88#if HAVE_WTSAPI32_H 98#if HAVE_WTSAPI32_H
89 if (!WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 99 if (!WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE,
90 0, 1, &wtsinfo, &wtscount)) { 100 0, 1, &wtsinfo, &wtscount)) {
@@ -156,6 +166,9 @@ main (int argc, char **argv)
156 if (spclose (child_process)) 166 if (spclose (child_process))
157 result = possibly_set (result, STATE_UNKNOWN); 167 result = possibly_set (result, STATE_UNKNOWN);
158#endif 168#endif
169#ifdef HAVE_LIBSYSTEMD
170 }
171#endif
159 172
160 /* check the user count against warning and critical thresholds */ 173 /* check the user count against warning and critical thresholds */
161 result = get_status((double)users, thlds); 174 result = get_status((double)users, thlds);
@@ -163,7 +176,7 @@ main (int argc, char **argv)
163 if (result == STATE_UNKNOWN) 176 if (result == STATE_UNKNOWN)
164 printf ("%s\n", _("Unable to read output")); 177 printf ("%s\n", _("Unable to read output"));
165 else { 178 else {
166 printf (_("USERS %s - %d users currently logged in |%s\n"), 179 printf (_("USERS %s - %d users currently logged in |%s\n"),
167 state_text(result), users, 180 state_text(result), users,
168 sperfdata_int("users", users, "", warning_range, 181 sperfdata_int("users", users, "", warning_range,
169 critical_range, TRUE, 0, FALSE, 0)); 182 critical_range, TRUE, 0, FALSE, 0));