1 /**
2 * collectd - src/users.c
3 * Copyright (C) 2005-2007 Sebastian Harl
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the license is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Sebastian Harl <sh at tokkee.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
26 #if HAVE_UTMPX_H
27 # include <utmpx.h>
28 #else /* !HAVE_UTMPX_H */
29 # if HAVE_UTMP_H
30 # include <utmp.h>
31 # endif /* HAVE_UTMP_H */
32 #endif /* HAVE_UTMPX_H */
34 #define MODULE_NAME "users"
36 #if HAVE_GETUTXENT || HAVE_GETUTENT
37 # define USERS_HAVE_READ 1
38 #else
39 # define USERS_HAVE_READ 0
40 #endif
42 #if USERS_HAVE_READ
43 static void users_submit (gauge_t value)
44 {
45 value_t values[1];
46 value_list_t vl = VALUE_LIST_INIT;
48 values[0].gauge = value;
50 vl.values = values;
51 vl.values_len = 1;
52 vl.time = time (NULL);
53 strcpy (vl.host, hostname_g);
54 strcpy (vl.plugin, "users");
56 plugin_dispatch_values ("users", &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 return (0);
98 } /* int users_read */
99 #endif /* USERS_HAVE_READ */
101 void module_register (void)
102 {
103 #if USERS_HAVE_READ
104 plugin_register_read ("users", users_read);
105 #endif
106 } /* void module_register(void) */