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Problem Report 0828 Details

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Report 0828 Actions

    Problem Report Number 0828
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0343
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published 1996-02-28 08:00
    Product Standard Commands and Utilities V2 (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSC version 4.1.5
    Test Identification POSIX.upe/ps 1004
    Problem Summary TSD4C.00168 This test may fail on implementations because a valid session id list may not be generated by the test.
    Problem Text
    This test may fail on implementations because a valid
    session id list may not be generated by the test.

    Reference: TSD4C.00028
    Note: Version 4.1.5 was changed to address this failure.
    However, the change was insufficient as explained below.

    This test case fails on platforms which require the grouplist
    argument to -g to contain only session leaders.

    The test case uses 'ps -o pgid=""' to generate a list of process ids.
    It then tests every pid through individual "ps -g $pid" calls to
    determine which ones are session leaders, before invoking "ps -g"
    with the final list of pids which are truly session leaders.

    The problem with the test case is that 'ps -o pgid=""' does not find
    session leaders, but only process group leaders. Process group leaders
    are not necessarily session leaders. In this instance there were
    no session leaders found to pass to 'ps -g', and the test failed.

    POSIX.2 definitions state:

    process group leader: A process whose process ID is the same
    as its process group ID. (POSIX.2 pg. 32, lines 836-837)

    session leader: A process that has created a session.
    (POSIX.2 pg. 34, lines 913-914)

    session: A collection of process groups established for job
    control purposes. (POSIX.2 pg. 34, lines 905-906)

    Therefore process group leaders and session leaders are not equivalent.

    The X/Open CAE specifications, Commands and Utilities Issue 4,
    Version 2 (pg. 593) states for the ps -g option:

    -g grouplist
    write information for processes whose session leaders are
    given in grouplist. The grouplist must be a single
    argument in the form of a blank- or comma-separated list.

    And for the -o option, with regards to the pgid format specification
    (pg 595):

    pgid: The decimal value of the process group ID

    The first specification verifies that the -g option should be testing
    for session leaders, not process group leaders. The latter verifies
    that the -o pgid="" specification will only list process group IDs,
    not session IDs.

    A portable workaround for finding session leaders is to do 'ps -o ppid=""'.
    The parent pid of one of the process group leaders should be a
    session leader. The pids should then be tested individually through
    calls to 'ps -g' to find the session leader, then the final 'ps -g'
    test can be performed.

    A workaround which uses HP-UX proprietary behavior, but is more
    straightforward: 'ps -o sid=""' will generate a list of
    session leaders. This can then be input directly to the final 'ps -g'
    since the pids have all been verified to be session leaders.
    Test Output
    200|412 1 09:50:13|TP Start
    520|412 1 3708 1 1|Assertion #1004 (A): ps -g writes information whose session
    520|412 1 3708 1 2| <LC> leaders are given in grouplist.
    520|412 1 3708 1 11|Expected exit code = 0; Received 1
    520|412 1 3708 1 12|Expected exit code = 0; Received 1
    220|412 1 1 09:50:14|FAIL
    410|412 1004 1 09:50:14|IC End

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We agree this is a test suite deficiency in the test
    suite version(s) listed.

    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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