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