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  1. Qt
  2. QTBUG-111964

QProcess::start does not return if setChildModifier hangs

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: P2: Important P2: Important
    • 6.5.2, 6.6.0
    • 6.4.0 FF
    • Core: I/O
    • None
    • Linux/X11
    • 29b2fe40d (dev), 65528387d (6.5), c5221f6be (dev)

      Previously in Qt 6.2.x it was possible to call "kill(getpid(), SIGSTOP);" inside the setChildProcessModifier callback. 

      This is necessary to start an app suspended, e.g. to later attach a debugger to it.

      With 6.4.x ( my guess would be with https://codereview.qt-project.org/c/qt/qtbase/+/417829 ) this hangs in QProcess::start.

      FYI: On macOS it still works, its just linux having an issue.

        1. processHang.cpp
          0.6 kB
        For Gerrit Dashboard: QTBUG-111964
        # Subject Branch Project Status CR V
        467493,5 Revert commit "don't ever force fork() instead of forkfd()" dev qt/qtbase Status: MERGED +2 0
        467508,18 QProcess/Linux: add a flag to re-enable the vfork()-like semantics dev qt/qtbase Status: MERGED +2 0
        477743,2 Revert commit "don't ever force fork() instead of forkfd()" 6.5 qt/qtbase Status: MERGED +2 0

            thiago Thiago Macieira
            madwinter Marcus Tillmanns
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              Created:
              Updated:
              Resolved:

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