1 /**
2 * collectd - src/users.c
3 * Copyright (C) 2005-2007 Sebastian Harl
4 * Copyright (C) 2005 Niki W. Waibel
5 * Copyright (C) 2005-2007 Florian octo Forster
6 * Copyright (C) 2008 Oleg King
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; only version 2 of the license is applicable.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * Authors:
22 * Sebastian Harl <sh at tokkee.org>
23 * Niki W. Waibel <niki.waibel at newlogic.com>
24 * Florian octo Forster <octo at collectd.org>
25 * Oleg King <king2 at kaluga.ru>
26 **/
28 #include "collectd.h"
30 #include "common.h"
31 #include "plugin.h"
33 #if HAVE_STATGRAB_H
34 # include <statgrab.h>
35 #endif /* HAVE_STATGRAB_H */
37 #if HAVE_UTMPX_H
38 # include <utmpx.h>
39 /* #endif HAVE_UTMPX_H */
41 #elif HAVE_UTMP_H
42 # include <utmp.h>
43 /* #endif HAVE_UTMP_H */
44 #endif
46 static void users_submit (gauge_t value)
47 {
48 value_t values[1];
49 value_list_t vl = VALUE_LIST_INIT;
51 values[0].gauge = value;
53 vl.values = values;
54 vl.values_len = 1;
55 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
56 sstrncpy (vl.plugin, "users", sizeof (vl.plugin));
57 sstrncpy (vl.type, "users", sizeof (vl.plugin));
59 plugin_dispatch_values (&vl);
60 } /* void users_submit */
62 static int users_read (void)
63 {
64 #if HAVE_GETUTXENT
65 unsigned int users = 0;
66 struct utmpx *entry = NULL;
68 /* according to the *utent(3) man page none of the functions sets errno
69 in case of an error, so we cannot do any error-checking here */
70 setutxent();
72 while (NULL != (entry = getutxent())) {
73 if (USER_PROCESS == entry->ut_type) {
74 ++users;
75 }
76 }
77 endutxent();
79 users_submit (users);
80 /* #endif HAVE_GETUTXENT */
82 #elif HAVE_GETUTENT
83 unsigned int users = 0;
84 struct utmp *entry = NULL;
86 /* according to the *utent(3) man page none of the functions sets errno
87 in case of an error, so we cannot do any error-checking here */
88 setutent();
90 while (NULL != (entry = getutent())) {
91 if (USER_PROCESS == entry->ut_type) {
92 ++users;
93 }
94 }
95 endutent();
97 users_submit (users);
98 /* #endif HAVE_GETUTENT */
100 #elif HAVE_LIBSTATGRAB
101 sg_user_stats *us;
103 # if HAVE_LIBSTATGRAB_0_90
104 size_t num_entries;
105 us = sg_get_user_stats (&num_entries);
106 # else
107 us = sg_get_user_stats ();
108 # endif
109 if (us == NULL)
110 return (-1);
112 users_submit ((gauge_t)
113 # if HAVE_LIBSTATGRAB_0_90
114 num_entries);
115 # else
116 us->num_entries);
117 # endif
118 /* #endif HAVE_LIBSTATGRAB */
120 #else
121 # error "No applicable input method."
122 #endif
124 return (0);
125 } /* int users_read */
127 void module_register (void)
128 {
129 plugin_register_read ("users", users_read);
130 } /* void module_register(void) */