bind() problem...

[Joachim Pluschke]

vxworks 5.4, Tronado 2, PPC860 target & bsp

Hi ALL,

I'm trying to make a TCP connection running....
but around the bind() call I'm not clear about what's happening...
To exclude an hints by "own" software i took the
tcpServer.c, tcpClient.c, tcpExample.h from the vx-onlinemanual.

When I set
serverAddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
or
serverAddr.sin_addr.s_addr = htonl (INADDR_ANY);
the tcpserver started up (i.e. the bind()-call was ok)
and in case of INADDR_ANY the client - server communication worked
(exchanging some strings).

BUT HOW TO PUT IN A SPECIFIC LOCAL IP THAT WORKS????

I took a look at byte-ordering , the servers IP interface (ifShow()) was
set as wanted.
Trying to feed in a specific IP (hex) in the according "struct
sockaddr_in" field like

serverAddr.sin_addr.s_addr = htonl ((u_long)(0xAC220107));/*172.16.1.7*/

_always_ caused the bind-error "0x31" ....
(EADDRNOTAVAIL 49 /* Can't assign requested address */)

ANY IDEAS why bind fails using a specific IP (servers' IP)????

I found a lot of articles around bind() and sockets in the
news-archives, but i didn't get the reason for this behaviour of bind().
Of course, using INADDR_ANY is not the solution.
(additional info: the target boots over network properly and can be
accessed with ftp!)

thanks in advance,
joachim

--

=====================================================
Gebrüder Stoye GmbH
department: traffic control systems
name: Joachim Pluschke
adr: Longericher Strasse 177
city: Cologne, Germany
zip: 50739
phone: ++49/221/1707013
fax: ++49/221/1707010
mailto: j.plu...@stoye.de
www: http://www.stoye.de
=====================================================

[Eric Lesch]

Hi Joachim,

Try using inet_addr("172.16.1.7") to avoid errors.

0xAC220107 = 172.34.1.7
Is that your problem?

Hope this helps,
Eric Lesch

[Urban Lindberg]

Hi

Using inet_addr("172.16.1.7") returns 0xAC100107 not 0xAC220107, which
one is correct the comment or the code?

HTH
Urban

[Joachim Pluschke]

thanks Eric!

Yes, now the sample-code bind() works.
- I should have typed in the correct IP and not rely on others
hex-values...

...sometimes problems seem to be confusing
but they're no problems... ;)

regards
Joachim

Eric Lesch schrieb: