Der Herr Hofrat wrote:
>
> > I'm using RTLV2.3 and kernel 2.2.14. I will most likely upgrade
> > everything
> > to the newer versions, but not until the test system is accepted by the
> > customer and that could be 3 months from now.
> >
> > I have miniRTL on 8 embedded machines 2 other Linux PC's and 3 Windows
> > machines on a local network. I have both real-time modules running on
> > my
> > linux PC's and user space applications. Specifically, the user space
> > applications send information to the Windows machines via ethernet
> > socket
> > code. I have a set of defined port numbers that the information uses.
> >
> > My problem is that sometimes when I know I have closed the code out and
> > I
> > restart it I get the message
> >
> > Unable to establish a port Connection: Address already in use.
> >
> > And sometimes I have to re-boot a linux computer to get rid of this
> > message
>
> this is happening because one side is not closing the socket cleanly so the
> other side has to listen for the handshake to timeout that is as far as I
> know 240s by default - so for this time the address is realy in use . you
> should never need to reboot though - if you check with netstat you will see
> that the port is in "FIN WAIT" state for quite a while if the other end hangs
> up - but latest after timeout*2 ( 8minutes) you should be able to restart
> everything . and at worst if that does not happen do a network stop/start
> - no need to reboot.
>
> hofrat
>
Try the socket option SO_REUSEADDR..
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