Re: Problem with UCX QIOW IO$_SETMODE

From: Valentin Likoum (me_at_privacy.net)
Date: 10/20/03

  • Next message: Dave Weatherall: "Re: XNET?" 
    Date: Mon, 20 Oct 2003 10:08:17 +0500

    Carl Perkins wrote:
    > "Ferry Bolhar" <bol@adv.magwien.gv.at> writes...
    [snip]
    > }However, when running the image, the second (and further) times, the iosb of
    > }the QIOW IO$_SETMODE request, which is used to set the socket parameters,
    > }returns in iosb[0] the return code SS$_DUPLNAM. According the documentation,
    > }this means that a process tries to listen on a TCP port which another
    > }process already is listening on. However, this isn't the case here - the
    > }image has terminated and the bg: device which represented the listening port
    > }(can be shown with UCX SHOW DEVICE) disappeared.
    > }However, after waiting for a minute, the QIOW call succeeds.
    [snip]
    > ** Set Socket Options:
    > **
    > ** Inform the network driver that we want to reuse this port address right
    > ** away.
    > **
    > ** There might be some old messages still on the network destined for the
    > ** last server that used this port. To avoid delivering these straggling
    > ** messages to the wrong server the network imposes a timeout that must
    > ** expire between the time a server finishes using a port and that port can be
    > ** can be assigned to another server. The following call will override this.
    > **
    > ** The benifit of overriding this time out is, we do not have to wait before
    > ** we can reuse the port address. The down side is, we might get messages
    > ** that were not ment for this server.
    > **
    > */
    >
    > After that is the setup for a QIO call that uses the TCPIP$M_REUSEADDR item.
    >
    > --- Carl

       Hmm.. I have been using this option since UCX 4.2 and now
    on TCPIP 5.1, but it seems never happens to work. Option is
    definitly set accordinly to UCX SHOW DEVICE/FULL output. But
    I always get SS$_DUPLNAM after server restart if I don't
    disconnect all the clients before server shutdown.
    Other options enabled on server' socket are KEEPALIVE and
    FDPX_CLOSE. 

    -- 
Best regards,
  Valentin
  valentin.likoum at ncc dot volga dot ru
  • Next message: Dave Weatherall: "Re: XNET?"

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