System calls in click

[Shweta Bhandare]

Hi Eddie,

	Thanks so much for your help. How much time do you think it takes to
execute a system call through click?

	The command takes a few msec's to execute teh command from teh command
line.

	The system call used is iwconfig eth0 txpower <value> - this sets the power
level of the ethernet card to transmit packets. The same protocol works well
when i comment out this system call - i.e. i receive ping replies in a
matter of a few milliseconds. Whereas the same line when uncommented, the
ping replies are delayed - what could be the reason?

Thanks,
Shweta

-----Original Message-----
From: Eddie Kohler [mailto:kohler at icir.org]
Sent: Sunday, June 02, 2002 11:48 PM
To: Shweta.Bhandare at colorado.edu
Cc: click at amsterdam.lcs.mit.edu
Subject: Re: Help Needed


Hi Shweta,

> 	Is it possible using click C++ programming level I mean, to get the MAC
> Address of a particular wireless ethernet card? in the .cc files I mean
when
> i say C++ programming level.

Use AddressInfo to do this. For example:

#include <click/standard/addressinfo.hh>

// ...

unsigned char ether_addr[6];
if (!AddressInfo::query_ethernet("devicename", ether_addr, this))
   return errh->error("no such device, or device is not Ethernet");

Eddie