[tao-users] After an upgrade of ACE/TAO from 2.2.2 to 2.3.3, the behaviour of the portspan parameter of -ORBListenEndpoints seems to have changed.

[Maarten Van Hout]

TAO VERSION: 2.3.3
ACE VERSION: 6.3.3

HOST MACHINE and OPERATING SYSTEM:
    Windows 7, Winsock2

COMPILER NAME AND VERSION (AND PATCHLEVEL):
    Visual Studio 2015 Express Edition 19.00.23918 for x86

THE $ACE_ROOT/ace/config.h FILE [if you use a link to a platform-
specific file, simply state which one]:
    ace/config-win32.h

CONTENTS OF $ACE_ROOT/bin/MakeProjectCreator/config/default.features
(used by MPC when you generate your own makefiles):
    -

AREA/CLASS/EXAMPLE AFFECTED:
    -

DOES THE PROBLEM AFFECT:
    COMPILATION? No
    LINKING? No
    EXECUTION? Yes
    The problem affects all our server applications.

SYNOPSIS:
    After an upgrade of ACE/TAO from 2.2.2 to 2.3.3, the behaviour
    of the portspan parameter of -ORBListenEndpoints seems to have
    changed.

DESCRIPTION:
    The following options are used to start our servers:
    -ORBListenEndpoints iiop://192.168.205.48:2001/portspan=31
    -ORBInitRef NameService=corbaloc:iiop:GET12022:1570/NameService

    With the first option, we use portspan=31 so our servers listen on
    the first free port, starting at 2001 till 2031.
    This has always worked, but ever since the upgrade, it didn't.

    What we saw when using TAO 2.3.3 was the following. After startup,
    all our servers where listening on port 2001, but only the first server
    to start was able to establish a connection with the naming service.

    With TAO 2.2.2 the behaviour was different. The first server started
    would use port 2001, the second 2002, and so on. What we expected our
    servers to continue doing after the upgrade to 2.3.3.

    We managed to get the needed behaviour by changing the first option to
    -ORBListenEndpoints iiop://192.168.205.48:2001/portspan=31&reuse_addr=0

    Is this the way to go now? Why did this behaviour change? Was it a bug that
    has been fixed? Or is it a bug now?

REPEAT BY:
    Please adjust the ip address in the following program. When executing
    this application twice, you should see the 2 applications listen
    on the same port (2001).

    #include "tao/TAO_Internal.h"
    #include "tao/PortableServer/PortableServer.h"

    int main()
    {
        CORBA::ORB_var orb = CORBA::ORB::_nil();
        PortableServer::POA_var poa = PortableServer::POA::_nil();
        PortableServer::POAManager_var poa_manager
            = PortableServer::POAManager::_nil();

        if(! CORBA::is_nil(orb)) return 1;
        char* oargv[] = {
        "dummy",
            "-ORBListenEndpoints",
            const_cast<char*>(
                "iiop://192.168.205.48:2001/portspan=31"),
            0
        };
        int oargc = (sizeof(oargv)/sizeof(char*)) - 1;
        orb = CORBA::ORB_init(oargc,oargv,"TAO_orb");

        CORBA::Object_var poa_object
            = orb->resolve_initial_references("RootPOA");
        poa = PortableServer::POA::_narrow(poa_object);
        poa_manager = poa->the_POAManager();
        poa_manager->activate();

        while(1);

        return 0;
    }

SAMPLE FIX/WORKAROUND:
    Changing the first option to
    -ORBListenEndpoints iiop://192.168.205.48:2001/portspan=31&reuse_addr=0
    did the trick.
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