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Forum Topic - socket bind and prefix:
   
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Thomas Zauner(deleted)
10/29/2008 1:55 PM
post15681
socket bind and prefix   
I use the io-net tcp stack startet like this, with prefix:
io-net -d rtl8169 -ptcpip prefix=/iopkt
SOCK=/iopkt ifconfig en0 192.168.1.10
When trying to bind a socket to address 192.168.1.10, bind fails with errno "Can't assign requested address".
I assume I have so specify the prefix somewhere.
Thanks in advance!
Thomas
Sean Boudreau(deleted)
10/29/2008 2:05 PM
post15683
Re: socket bind and prefix   
On Wed, Oct 29, 2008 at 01:55:22PM -0400, Thomas Zauner wrote:
> I use the io-net tcp stack startet like this, with prefix:
> io-net -d rtl8169 -ptcpip prefix=/iopkt
> SOCK=/iopkt ifconfig en0 192.168.1.10
> When trying to bind a socket to address 192.168.1.10, bind fails with errno "Can't assign requested address".
> I assume I have so specify the prefix somewhere.
> Thanks in advance!
> Thomas

You need to have the program doing the bind() inherit or
specify the same SOCK envar when doing the socket() call.

# SOCK=/iopkt myprog

-seanb
Thomas Zauner(deleted)
10/31/2008 5:25 AM
post15777
Re: socket bind and prefix   
Thanks, Sean and Robert.
My problem is: The system is equipped by my customer. They installed both io-net and io-pkt for the 2 network cards, as 
they did not get both adapters to run with io-pkt. I want to do UDP communication with the first adapter, and pcap with 
the second. If I specify SOCK, I can access only one adapter in my program.
Is it possible for a program to access 2 stacks at a time, or should my custerms try to set up io-pkt correctly for the 
2 adapters?

Thomas

(SOCK=/iopkt ifconfig returns one interface, and ifconfig returns the other interface)
(You are right, the network forum would have been better. I'll use it for the next related questions.)
Sean Boudreau(deleted)
10/31/2008 8:58 AM
post15785
Re: socket bind and prefix   
On Fri, Oct 31, 2008 at 05:25:05AM -0400, Thomas Zauner wrote:
> Thanks, Sean and Robert.
> My problem is: The system is equipped by my customer. They installed both io-net and io-pkt for the 2 network cards, 
as they did not get both adapters to run with io-pkt. I want to do UDP communication with the first adapter, and pcap 
with the second. If I specify SOCK, I can access only one adapter in my program.
> Is it possible for a program to access 2 stacks at a time, or should my custerms try to set up io-pkt correctly for 
the 2 adapters?

It's possible.  You'd have to clearenv(), setenv() SOCK as
required before each socket() call to target a particular
stack.  Or you could get a seed socket for each stack once
via the SOCK method, leave it open and do openfd() on them
as required which will get you a socket of the same domain,
type, protocol as the seed managed by the same stack.

-seanb
Robert Craig
10/31/2008 10:15 AM
post15794
RE: socket bind and prefix   
Is the real reason for running io-net and io-pkt to get both adapters
working?  If so, then why not just run the io-net driver with the shim
in io-pkt?  The setenv definitely works.  I've done it in the past in
order to access two stacks (one doing data plane and one doing
management) in a single app.

	Robert.

-----Original Message-----
From: Sean Boudreau [mailto:community-noreply@qnx.com] 
Sent: Friday, October 31, 2008 8:59 AM
To: ostech-core_os
Subject: Re: socket bind and prefix

On Fri, Oct 31, 2008 at 05:25:05AM -0400, Thomas Zauner wrote:
> Thanks, Sean and Robert.
> My problem is: The system is equipped by my customer. They installed
both io-net and io-pkt for the 2 network cards, as they did not get both
adapters to run with io-pkt. I want to do UDP communication with the
first adapter, and pcap with the second. If I specify SOCK, I can access
only one adapter in my program.
> Is it possible for a program to access 2 stacks at a time, or should
my custerms try to set up io-pkt correctly for the 2 adapters?

It's possible.  You'd have to clearenv(), setenv() SOCK as
required before each socket() call to target a particular
stack.  Or you could get a seed socket for each stack once
via the SOCK method, leave it open and do openfd() on them
as required which will get you a socket of the same domain,
type, protocol as the seed managed by the same stack.

-seanb

_______________________________________________
OSTech
http://community.qnx.com/sf/go/post15785
Robert Craig
10/29/2008 2:06 PM
post15684
RE: socket bind and prefix   
I'm a bit confused as to why you'd do the "prefix=/iopkt" with io-net.
If this is on 6.4, then io-net isn't present at all.

In any case, if you do

SOCK=/iopkt ifconfig

Does it report any interfaces at all?

	Robert.

P.S.  This question is best posted in the Networking forum rather than
an OS forum.

-----Original Message-----
From: Thomas Zauner [mailto:community-noreply@qnx.com] 
Sent: Wednesday, October 29, 2008 1:55 PM
To: ostech-core_os
Subject: socket bind and prefix

I use the io-net tcp stack startet like this, with prefix:
io-net -d rtl8169 -ptcpip prefix=/iopkt
SOCK=/iopkt ifconfig en0 192.168.1.10
When trying to bind a socket to address 192.168.1.10, bind fails with
errno "Can't assign requested address".
I assume I have so specify the prefix somewhere.
Thanks in advance!
Thomas


_______________________________________________
OSTech
http://community.qnx.com/sf/go/post15681

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