libstatgrab/docs/network.txt

Network Statistics

All network statistics return a network_stat_t structure.

typedef struct{
        char *interface_name;
        long long tx;
        long long rx;
        time_t systime;
}network_stat_t;

Interface name is the name known to the OS. E.g. eth0 on linux.
tx is a long long with the number of bytes transmitted.
rx is a long long with the number of bytes recieved.
sysname is time_t covering the time the amount of data in rx/tx was 
generated.


network_stat_t *get_network_stats(int *entries);

network_stat_t *get_network_stats_diff(int *entries);

Both calls takes a pointer to a int, entries. This is filled with the number 
of network interfaces the machine has. You need to know this to know how 
many network_stat_t how many network_stat_t have been returned.

get_network_stats returns the network traffic stored in the kernel. E.g. 
since bootup as long as the way it is stored in the kernel can store a large 
enough number. Solaris 7 can not, it only stores it in a 32bit int, so it 
can only store upto 4gb before it will wrap around. Solaris 8 upwards stores 
it in a 64bit int and so is a very large number :)

get_network_stats_diff is the same as get_network_stats except it will 
return the difference since the last call. So, for instance a call to 
get_network_stats_diff is made, and called again 5 seconds later. Over that 
time, 20 bytes of traffic was transmitted and 10 bytes received. Tx will 
store 20, rx will store 10 and systime will store 5. This function copes 
with wrap arounds by the O/S so should be seemless to use.

Bugs:
get_network_stats_diff on very first call will return the same as  
get_network_stats. After first call it will always return the difference.

Very basic example in examples/network_traffic.c

Revision:	1.1
Committed:	Sun May 11 17:05:23 2003 UTC (21 years ago) by pajs
Content type:	text/plain
Branch:	MAIN
Log Message:	Added basic docs for network stats, and a example. Needs some basic work, and no doubt several typos :)
#	User	Rev	Content
1	pajs	1.1	Network Statistics
2
3			All network statistics return a network_stat_t structure.
4
5			typedef struct{
6			char *interface_name;
7			long long tx;
8			long long rx;
9			time_t systime;
10			}network_stat_t;
11
12			Interface name is the name known to the OS. E.g. eth0 on linux.
13			tx is a long long with the number of bytes transmitted.
14			rx is a long long with the number of bytes recieved.
15			sysname is time_t covering the time the amount of data in rx/tx was
16			generated.
17
18
19			network_stat_t get_network_stats(int entries);
20
21			network_stat_t get_network_stats_diff(int entries);
22
23			Both calls takes a pointer to a int, entries. This is filled with the number
24			of network interfaces the machine has. You need to know this to know how
25			many network_stat_t how many network_stat_t have been returned.
26
27			get_network_stats returns the network traffic stored in the kernel. E.g.
28			since bootup as long as the way it is stored in the kernel can store a large
29			enough number. Solaris 7 can not, it only stores it in a 32bit int, so it
30			can only store upto 4gb before it will wrap around. Solaris 8 upwards stores
31			it in a 64bit int and so is a very large number :)
32
33			get_network_stats_diff is the same as get_network_stats except it will
34			return the difference since the last call. So, for instance a call to
35			get_network_stats_diff is made, and called again 5 seconds later. Over that
36			time, 20 bytes of traffic was transmitted and 10 bytes received. Tx will
37			store 20, rx will store 10 and systime will store 5. This function copes
38			with wrap arounds by the O/S so should be seemless to use.
39
40			Bugs:
41			get_network_stats_diff on very first call will return the same as
42			get_network_stats. After first call it will always return the difference.
43
44			Very basic example in examples/network_traffic.c
45