2739c2beec307bb17f9e55460f0f5ada5ae58b74
1 /**
2 * collectd - src/users.c
3 * Copyright (C) 2005 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; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Sebastian Harl <sh at tokkee.org>
21 **/
23 #include "common.h"
24 #include "plugin.h"
25 #include "users.h"
27 #if HAVE_UTMPX_H
28 # include <utmpx.h>
29 #else /* !HAVE_UTMPX_H */
30 # if HAVE_UTMP_H
31 # include <utmp.h>
32 # endif /* HAVE_UTMP_H */
33 #endif /* HAVE_UTMPX_H */
35 #define MODULE_NAME "users"
37 static char *rrd_file = "users.rrd";
38 static char *ds_def[] =
39 {
40 "DS:users:GAUGE:25:0:65535",
41 NULL
42 };
43 static int ds_num = 1;
45 static void users_init (void)
46 {
47 /* we have nothing to do here :-) */
48 return;
49 } /* static void users_init(void) */
51 static void users_write (char *host, char *inst, char *val)
52 {
53 rrd_update_file(host, rrd_file, val, ds_def, ds_num);
54 return;
55 } /* static void users_write(char *host, char *inst, char *val) */
57 /* I don't like this temporary macro definition - well it's used everywhere
58 else in the collectd-sources, so I will just stick with it... */
59 #define BUFSIZE 256
60 static void users_submit (unsigned int users)
61 {
62 char buf[BUFSIZE] = "";
64 if (snprintf(buf, BUFSIZE, "%u:%u",
65 (unsigned int)curtime, users) >= BUFSIZE)
66 {
67 return;
68 }
70 plugin_submit(MODULE_NAME, NULL, buf);
71 return;
72 } /* static void users_submit(unsigned int users) */
73 #undef BUFSIZE
75 static void users_read (void)
76 {
77 #if HAVE_GETUTXENT
78 unsigned int users = 0;
79 struct utmpx *entry = NULL;
81 /* according to the *utent(3) man page none of the functions sets errno
82 in case of an error, so we cannot do any error-checking here */
83 setutxent();
85 while (NULL != (entry = getutxent())) {
86 if (USER_PROCESS == entry->ut_type) {
87 ++users;
88 }
89 }
90 endutxent();
92 users_submit (users);
93 /* #endif HAVE_GETUTXENT */
95 #elif HAVE_GETUTENT
96 unsigned int users = 0;
97 struct utmp *entry = NULL;
99 /* according to the *utent(3) man page none of the functions sets errno
100 in case of an error, so we cannot do any error-checking here */
101 setutent();
103 while (NULL != (entry = getutent())) {
104 if (USER_PROCESS == entry->ut_type) {
105 ++users;
106 }
107 }
108 endutent();
110 users_submit(users);
111 #endif /* HAVE_GETUTENT */
113 return;
114 } /* static void users_read(void) */
116 void module_register (void)
117 {
118 plugin_register (MODULE_NAME, users_init, users_read, users_write);
119 return;
120 } /* void module_register(void) */