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  4. QFileSystemWatcher not working with /etc/mtab

QFileSystemWatcher not working with /etc/mtab

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  • D Offline
    D Offline
    dangelog
    wrote on last edited by
    #3

    Works for me -- are you returning to the event loop?

    Software Engineer
    KDAB (UK) Ltd., a KDAB Group company

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    • T Offline
      T Offline
      TheQtGuy
      wrote on last edited by
      #4

      loladiro: I read that page before, but I didn't quite understood what was going on...

      peppe: I don't know what would be to return to the event loop, but my guess is that my code is correct, otherwise it wouldn't work with files inside /home directory right?

      @watcher = new QFileSystemWatcher(QStringList() << "/etc/mtab",this);
      connect(watcher, SIGNAL(fileChanged(const QString &)), this, SLOT(getPathFromFile(const QString &)));@

      If I change "/etc/mtab" to say a file in my home folder, the fileChanged signal is emitted, but not for "etc/mtab" file :(

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      • L Offline
        L Offline
        loladiro
        wrote on last edited by
        #5

        The patch to Qt Mobility I linked basically changes the QFilesSystemWatcher and uses its inotify backend for linux. I think it is pretty straight forward what is going on, and since it does exactly what you want (listening for new devices), it might be worth it for you to see what's going on and how they replaced the old QFileSystemWatcher syntax (in red) with inotify (in green).

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        • D Offline
          D Offline
          dangelog
          wrote on last edited by
          #6

          Can you paste a small, correct, compilable example that shows your problem? I know QFSW is bugged, but it appears to be working fine for me (inotify backend, Linux 3.0).

          Software Engineer
          KDAB (UK) Ltd., a KDAB Group company

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          • McLionM Offline
            McLionM Offline
            McLion
            wrote on last edited by
            #7

            Sorry to dig this thread up and hijack it.
            How do you get an event when an USB device is plugged (ie. Memory stick as dev/sda1)?

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            • J Offline
              J Offline
              jafarabadi.qt
              wrote on last edited by
              #8

              Hi TheQtGuy
              i don't have any efficient solution but offer some idea:

              • Run Qt Creator as root :)
                @sudo -b qtcreator@

              • your real-time access problem is with Dir o File? check it !

              say more about ur prob. and share ur experience dear ;)

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              • McLionM Offline
                McLionM Offline
                McLion
                wrote on last edited by
                #9

                @ a.jafarabadi: ???

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                • J Offline
                  J Offline
                  jafarabadi.qt
                  wrote on last edited by
                  #10

                  excuse me friend because of my low english writing ability
                  i think that you want check your USB devices, and for doing it, you watch a file usign filewatcher that OS change it when a new usb connect or disconnect, but your watch doesn't work and does not determine any change in file.
                  now you want understand why this problem occured? YES?

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                  • McLionM Offline
                    McLionM Offline
                    McLion
                    wrote on last edited by
                    #11

                    Not exactly.
                    If I attach a UBS memorystick it does not get mounted automatically so I can not monitor /etc/mtab.
                    I need to somehow catch the USB plug event and get the device path (i.e. /dev/sda1) and then handle the mount from my Qt code.

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                    • McLionM Offline
                      McLionM Offline
                      McLion
                      wrote on last edited by
                      #12

                      .. or could QFileSystemWatcher used to monitor the /dev ?
                      This way I t could generate an event when an sd?? is added.

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                      • McLionM Offline
                        McLionM Offline
                        McLion
                        wrote on last edited by
                        #13

                        Just like to add that this works as proposed using QFileSystemWatcher used to monitor the /dev. On the event I do some filtering using QDir ... that's it.

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