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 */
37 #define MODULE_NAME "users"
39 static char *rrd_file = "users.rrd";
40 static char *ds_def[] = {
41 "DS:users:GAUGE:25:0:65535",
42 NULL
43 };
44 static int ds_num = 1;
48 static void users_submit(unsigned int users);
49 static void users_init(void);
50 static void users_read(void);
51 static void users_write(char *host, char *inst, char *val);
55 /* I don't like this temporary macro definition - well it's used everywhere
56 else in the collectd-sources, so I will just stick with it... */
57 #define BUFSIZE 256
58 static void
59 users_submit(unsigned int users)
60 {
61 char buf[BUFSIZE] = "";
63 if (snprintf(buf, BUFSIZE, "%u:%u",
64 (unsigned int)curtime, users) >= BUFSIZE)
65 {
66 return;
67 }
69 plugin_submit(MODULE_NAME, NULL, buf);
70 return;
71 } /* static void users_submit(unsigned int users) */
72 #undef BUFSIZE
76 static void
77 users_init(void)
78 {
79 /* we have nothing to do here :-) */
80 return;
81 } /* static void users_init(void) */
83 static void
84 users_read(void)
85 {
86 #if HAVE_GETUTXENT
87 unsigned int users = 0;
88 struct utmpx *entry = NULL;
90 /* according to the *utent(3) man page none of the functions sets errno
91 in case of an error, so we cannot do any error-checking here */
92 setutxent();
94 while (NULL != (entry = getutxent())) {
95 if (USER_PROCESS == entry->ut_type) {
96 ++users;
97 }
98 }
99 endutxent();
101 users_submit(users);
102 #else /* !HAVE_GETUTXENT */
103 # if HAVE_GETUTENT
104 unsigned int users = 0;
105 struct utmp *entry = NULL;
107 /* according to the *utent(3) man page none of the functions sets errno
108 in case of an error, so we cannot do any error-checking here */
109 setutent();
111 while (NULL != (entry = getutent())) {
112 if (USER_PROCESS == entry->ut_type) {
113 ++users;
114 }
115 }
116 endutent();
118 users_submit(users);
119 # endif /* HAVE_GETUTENT */
120 #endif /* HAVE_GETUTXENT */
122 return;
123 } /* static void users_read(void) */
125 static void
126 users_write(char *host, char *inst, char *val)
127 {
128 rrd_update_file(host, rrd_file, val, ds_def, ds_num);
129 return;
130 } /* static void users_write(char *host, char *inst, char *val) */
134 void
135 module_register(void)
136 {
137 plugin_register(MODULE_NAME, users_init, users_read, users_write);
138 return;
139 } /* void module_register(void) */