1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* $Id: plugin_loadavg.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_loadavg.c $
*
* plugin for load average
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int plugin_init_loadavg (void)
* adds functions for load average
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include "debug.h"
#include "plugin.h"
#ifndef HAVE_GETLOADAVG
static int fd = -2;
int getloadavg(double loadavg[], int nelem)
{
char buf[65], *p;
ssize_t nread;
int i;
if (fd == -2)
fd = open("/proc/loadavg", O_RDONLY);
if (fd < 0)
return -1;
lseek(fd, 0, SEEK_SET);
nread = read(fd, buf, sizeof buf - 1);
if (nread < 0)
return -1;
buf[nread - 1] = '\0';
if (nelem > 3)
nelem = 3;
p = buf;
for (i = 0; i < nelem; ++i) {
char *endp;
loadavg[i] = strtod(p, &endp);
if (endp == NULL || endp == p)
/* This should not happen. The format of /proc/loadavg
must have changed. Don't return with what we have,
signal an error. */
return -1;
p = endp;
}
return i;
}
#endif
static void my_loadavg(RESULT * result, RESULT * arg1)
{
static int nelem = -1;
int index, age;
static double loadavg[3];
static struct timeval last_value;
struct timeval now;
gettimeofday(&now, NULL);
age = (now.tv_sec - last_value.tv_sec) * 1000 + (now.tv_usec - last_value.tv_usec) / 1000;
/* reread every 10 msec only */
if (nelem == -1 || age == 0 || age > 10) {
nelem = getloadavg(loadavg, 3);
if (nelem < 0) {
error("getloadavg() failed!");
SetResult(&result, R_STRING, "");
return;
}
last_value = now;
}
index = R2N(arg1);
if (index < 1 || index > nelem) {
error("loadavg(%d): index out of range!", index);
SetResult(&result, R_STRING, "");
return;
}
SetResult(&result, R_NUMBER, &(loadavg[index - 1]));
return;
}
int plugin_init_loadavg(void)
{
AddFunction("loadavg", 1, my_loadavg);
return 0;
}
void plugin_exit_loadavg(void)
{
#ifndef HAVE_GETLOADAVG
if (fd > 0)
close(fd);
fd = -2;
#endif
}
|
