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Re^5: Is there a problem with IPC::Open on Windows 7?

by glasswalk3r (Pilgrim)
on Aug 12, 2013 at 18:07 UTC ( #1049155=note: print w/ replies, xml ) Need Help??


in reply to Re^4: Is there a problem with IPC::Open on Windows 7?
in thread Is there a problem with IPC::Open on Windows 7?

Maybe a bug opened to update the documentation would be a good idea? There are couple of workarounds for IPC::Open3, but none seems to be able to reach core.

Anyway, it seems to be possible to dup() sockets under MS Windows and use select() over them, but as I replied before, I need to do more tests with it.

Alceu Rodrigues de Freitas Junior
---------------------------------
"You have enemies? Good. That means you've stood up for something, sometime in your life." - Sir Winston Churchill


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Re^6: Is there a problem with IPC::Open on Windows 7?
by BrowserUk (Pope) on Aug 12, 2013 at 18:39 UTC
    it seems to be possible to dup() sockets under MS Windows and use select()

    Really? How would that work?

    To the best of my knowledge -- which I thought was pretty good on this subject -- Perl's select is implemented in terms of the winSock select() function which will always return WSAENOTSOCK if any of the descriptors in the set is not a socket.


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
      Really? How would that work? To the best of my knowledge -- which I thought was pretty good on this subject -- Perl's select is implemented in terms of the winSock select() function which will always return WSAENOTSOCK if any of the descriptors in the set is not a socket.

      I'm not a MS Windows specialist and I cannot give all the details of how it works since I copying implementation code from others, but so far it is working 100% for STDOUT, and some initial testing for STDERR is looking good too.

      Here is one implementation which I based mine: https://github.com/lucastheisen/ipc-open3-callback

      And here is my implementation (take a look at Siebel::Srvrmgr::Daemon run() method and Test::Siebel::Srvrmgr::Daemon runs_with_stderr() method): http://code.google.com/p/siebel-monitoring-tools/source/browse/

      Specific to the runs_with_stderr method, the test is not complete (the return code is being get from the Log::Log4perl log method) but if you keep the default logger configuration (see Siebel::Srvrmgr) you will get the STDERR from the srvrmgr-mock.pl script (included in the distribution).

      Alceu Rodrigues de Freitas Junior
      ---------------------------------
      "You have enemies? Good. That means you've stood up for something, sometime in your life." - Sir Winston Churchill
        Here is one implementation which I based mine: https://github.com/lucastheisen/ipc-open3-callback

        Okay. That makes more sense than your original description -- though I see how you arrived at that description.

        Essentially, they are doing the same thing as Win32::SocketPairopen2() and Win32::SocketPairopen2_5() (original author:salva), in that they are redirecting the outputs from the commands via socket pairs, which are selectable.

        I'm like the idea of IPC::Open3::Callback. It is a very clever way to address both the problems with IPC::Open3.

        However, as it stands, it steals both the pid of the subprocess, and the stdin; which make it less useful than it could be. I can see myself stealing the idea of the callbacks and producing my own version that corrects for those. (Assuming the author doesn't modify his interface before sending it to cpan :)


        With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.

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