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Problem Report 0210 Details

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Report 0210 Actions

    Problem Report Number 0210
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0210
    Raised 1995-05-04 08:00
    Updated 2003-03-13 08:00
    Published 1995-05-10 08:00
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.3.4
    Test Identification ANSI.os/signal/signal_X 8
    Problem Summary TSD4.210 There appears to be a timing problem in this test that can cause unpredictable results. For each signal tested, the child process is created. This child will set a handler for the signal being tested ...
    Problem Text
    There appears to be a timing problem in this test that can cause
    unpredictable results. For each signal tested, the child process is
    created. This child will set a handler for the signal being tested
    and enter a loop that it will leave only after the signal is
    delivered. Meanwhile, the parent does a sleep() and then sends a
    single signal. The problem with this scenario is that the parent only
    sleeps for one second. This assumes that the signal is delivered to
    the child after the handler is established but this which cannot be
    guaranteed and should not be expected. When the test is run with VSX
    debugging enabled, the test passes but this timing problem does not
    make this a good general test.

    The test should be modified to have the parent wait until the child is
    in the loop. For example, before the fork(), a pipe could be created.
    The parent will block on reading from the pipe until the child is
    ready to enter its loop and writes a byte to the pipe. Once the
    parent is un-blocked, it would be sensible to do a sleep() for a short
    period of time. One second may be enough but it might be better to use
    a variable (such as "WAITTIME") that can change depending on the
    platform being used.
    Test Output
    /tset/ANSI.os/signal/signal_X/T.signal_X 8 Unresolved

    Test Description:
    except SIGFPE
    when the signal handling procedure func executes a return statement,
    the program will resume execution at the point it was interrupted;

    Test Information:
    child process timed out

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    It is accepted that there is the possibility that the signal will be
    delivered to the child process before the signal handler has been
    established. Since this test executes correctly with VSX debugging set,
    it is recommended that this failure be treated as a test suite deficiency.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion
    This is an agreed Test Suite Deficiency

    Problem Reporting System Options:

     

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