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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
This file is part of pload - a program to monitor ppp activity for X
Copyright (C) 1999-2000 Matt Smith <mdsmith@engr.utk.edu>
This program 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 of the License, or
(at your option) any later version.
This program 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.
*/
/* get_stat.c */
#include <stdio.h> /* perror */
#include <stdlib.h> /* exit, atoi */
#include <unistd.h> /* gettimeofday */
#include <sys/time.h> /* gettimeofday */
#include <string.h> /* memset */
#include <errno.h> /* perror */
#include "pload.h"
/* global variables */
extern int errno;
void ifd_initialize( if_data *ifd,
char *device,
int histsize,
int useProc)
{
memset(ifd, 0, sizeof(if_data));
ifd->device = device;
ifd->history_size = histsize;
#ifdef STREAMS
/* note: It is assumed that the device number
is just the 4th character. This currently
isn't a problem because dev_n is only used
in the stream based interface. I only know
how to get ppp statistics from streams. */
ifd->dev_n = atoi(device+3); /* the X of pppX */
#endif
#ifdef LINUXPROC
if (useProc)
ifd->getstats = proc_stat; /* use /proc/net/dev */
else
ifd->getstats = ioctl_stat; /* use ioctl() */
#else
ifd->getstats = ioctl_stat; /* non-linuxproc gets ioctl always */
#endif
/* allocate the arrays to average points over */
if (histsize < 1) die("number of average points can't be < 1");
ifd->in_history = (double *)calloc(ifd->history_size, sizeof(double));
ifd->out_history = (double *)calloc(ifd->history_size, sizeof(double));
if ((ifd->in_history == NULL) || (ifd->out_history == NULL))
die("calloc failed");
}
void ifd_stop(if_data *ifd)
{
free(ifd->in_history);
free(ifd->out_history);
memset(ifd, 0, sizeof(if_data));
}
void get_stat(if_data *ifd)
{
double delta_t;
double rate;
double sum;
int i;
/* get in_bytes and out_bytes */
ifd->getstats(ifd);
if (gettimeofday(&ifd->curr_time, NULL) != 0)
die("gettimeofday");
/* double seconds */
delta_t = (double)
((ifd->curr_time.tv_sec - ifd->prev_time.tv_sec) * 1000000L
+(ifd->curr_time.tv_usec - ifd->prev_time.tv_usec)) / 1000000.0;
/******** in rate ******************/
if ((ifd->in_bytes_old == 0UL) || (ifd->in_bytes_old > ifd->in_bytes))
/* first time around or hangups */
rate = 0.0;
else
rate =(double)(ifd->in_bytes - ifd->in_bytes_old) / delta_t;
sum = 0.0;
for (i=0;i<=ifd->history_size-2;i++) /* doesn't happen if size==1 */
{
ifd->in_history[i] =
ifd->in_history[i+1]; /* shift all past values down */
sum +=ifd->in_history[i]; /* keep a running total */
}
ifd->in_history[ifd->history_size-1] = rate; /* put current at end */
/* averaged rate */
ifd->in_rate = (sum + ifd->in_history[ifd->history_size-1])
/ (double)ifd->history_size;
/***********************************/
/******** out rate ******************/
if ((ifd->out_bytes_old == 0UL) || (ifd->out_bytes_old > ifd->out_bytes))
/* first time around or hangups */
rate = 0.0;
else
rate =(double)(ifd->out_bytes - ifd->out_bytes_old) / delta_t;
sum = 0.0;
for (i=0;i<=ifd->history_size-2;i++) /* doesn't happen if size==1 */
{
ifd->out_history[i] =
ifd->out_history[i+1]; /* shift all past values down */
sum +=ifd->out_history[i]; /* keep a running total */
}
ifd->out_history[ifd->history_size-1] = rate; /* put current at end */
/* averaged rate */
ifd->out_rate = (sum + ifd->out_history[ifd->history_size-1])
/ (double)ifd->history_size;
/***********************************/
/* find maximum rates */
if (ifd->in_rate > ifd->in_max) ifd->in_max = ifd->in_rate;
if (ifd->out_rate > ifd->out_max) ifd->out_max = ifd->out_rate;
/* old = new */
memcpy(&ifd->prev_time, &ifd->curr_time, sizeof(struct timeval));
ifd->in_bytes_old = ifd->in_bytes;
ifd->out_bytes_old = ifd->out_bytes;
return;
}
void die(char *m)
{
perror(m);
exit(EXIT_FAILURE);
}
|
