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"
29 #include "common.h"
30 #include "plugin.h"
32 #if HAVE_STATGRAB_H
33 # include <statgrab.h>
34 #endif /* HAVE_STATGRAB_H */
36 #if HAVE_UTMPX_H
37 # include <utmpx.h>
38 /* #endif HAVE_UTMPX_H */
40 #elif HAVE_UTMP_H
41 # include <utmp.h>
42 /* #endif HAVE_UTMP_H */
43 #endif
45 static void users_submit (gauge_t value)
46 {
47 value_t values[1];
48 value_list_t vl = VALUE_LIST_INIT;
50 values[0].gauge = value;
52 vl.values = values;
53 vl.values_len = 1;
54 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
55 sstrncpy (vl.plugin, "users", sizeof (vl.plugin));
56 sstrncpy (vl.type, "users", sizeof (vl.plugin));
58 plugin_dispatch_values (&vl);
59 } /* void users_submit */
61 static int users_read (void)
62 {
63 #if HAVE_GETUTXENT
64 unsigned int users = 0;
65 struct utmpx *entry = NULL;
67 /* according to the *utent(3) man page none of the functions sets errno
68 in case of an error, so we cannot do any error-checking here */
69 setutxent();
71 while (NULL != (entry = getutxent())) {
72 if (USER_PROCESS == entry->ut_type) {
73 ++users;
74 }
75 }
76 endutxent();
78 users_submit (users);
79 /* #endif HAVE_GETUTXENT */
81 #elif HAVE_GETUTENT
82 unsigned int users = 0;
83 struct utmp *entry = NULL;
85 /* according to the *utent(3) man page none of the functions sets errno
86 in case of an error, so we cannot do any error-checking here */
87 setutent();
89 while (NULL != (entry = getutent())) {
90 if (USER_PROCESS == entry->ut_type) {
91 ++users;
92 }
93 }
94 endutent();
96 users_submit (users);
97 /* #endif HAVE_GETUTENT */
99 #elif HAVE_LIBSTATGRAB
100 sg_user_stats *us;
102 # if HAVE_LIBSTATGRAB_0_90
103 size_t num_entries;
104 us = sg_get_user_stats (&num_entries);
105 # else
106 us = sg_get_user_stats ();
107 # endif
108 if (us == NULL)
109 return (-1);
111 users_submit ((gauge_t)
112 # if HAVE_LIBSTATGRAB_0_90
113 num_entries);
114 # else
115 us->num_entries);
116 # endif
117 /* #endif HAVE_LIBSTATGRAB */
119 #else
120 # error "No applicable input method."
121 #endif
123 return (0);
124 } /* int users_read */
126 void module_register (void)
127 {
128 plugin_register_read ("users", users_read);
129 } /* void module_register(void) */