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_list_t vl = VALUE_LIST_INIT;
50 vl.values = &(value_t) { .gauge = value };
51 vl.values_len = 1;
52 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
53 sstrncpy (vl.plugin, "users", sizeof (vl.plugin));
54 sstrncpy (vl.type, "users", sizeof (vl.plugin));
56 plugin_dispatch_values (&vl);
57 } /* void users_submit */
59 static int users_read (void)
60 {
61 #if HAVE_GETUTXENT
62 unsigned int users = 0;
63 struct utmpx *entry = NULL;
65 /* according to the *utent(3) man page none of the functions sets errno
66 in case of an error, so we cannot do any error-checking here */
67 setutxent();
69 while (NULL != (entry = getutxent())) {
70 if (USER_PROCESS == entry->ut_type) {
71 ++users;
72 }
73 }
74 endutxent();
76 users_submit (users);
77 /* #endif HAVE_GETUTXENT */
79 #elif HAVE_GETUTENT
80 unsigned int users = 0;
81 struct utmp *entry = NULL;
83 /* according to the *utent(3) man page none of the functions sets errno
84 in case of an error, so we cannot do any error-checking here */
85 setutent();
87 while (NULL != (entry = getutent())) {
88 if (USER_PROCESS == entry->ut_type) {
89 ++users;
90 }
91 }
92 endutent();
94 users_submit (users);
95 /* #endif HAVE_GETUTENT */
97 #elif HAVE_LIBSTATGRAB
98 sg_user_stats *us;
100 # if HAVE_LIBSTATGRAB_0_90
101 size_t num_entries;
102 us = sg_get_user_stats (&num_entries);
103 # else
104 us = sg_get_user_stats ();
105 # endif
106 if (us == NULL)
107 return (-1);
109 users_submit ((gauge_t)
110 # if HAVE_LIBSTATGRAB_0_90
111 num_entries);
112 # else
113 us->num_entries);
114 # endif
115 /* #endif HAVE_LIBSTATGRAB */
117 #else
118 # error "No applicable input method."
119 #endif
121 return (0);
122 } /* int users_read */
124 void module_register (void)
125 {
126 plugin_register_read ("users", users_read);
127 } /* void module_register(void) */