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Problem Report 2707 Details

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Report 2707 Actions

    Problem Report Number 2707
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Permanent Interpretation (PIN)
    Problem Resolution ID PIN.X.0295
    Raised 2020-03-31 08:18
    Updated 2020-03-31 10:02
    Published 2020-03-31 10:02
    Product Standard Commands and Utilities V4 (UNIX 03)
    Certification Program The Open Brand certification program
    Test Suite VSC version 5.3.17NW
    Test Identification test/POSIX.cmd/sed/sed.ex Assertion 101
    Specification Shell and Utilities Issue 6
    Location in Spec The Open Group Base Specifications Issue 6, specification for "sed - stream editor".
    Problem Summary The sed test for assertion 101 incorrectly expects an empty stderr, while the standard permits (and
    even encourages) it.
    Problem Text In the VSC5.3.17NW test for the sed utility, Assertion 101 creates a sed script with an unused label.
    It then runs a test with the script, and at the end attempts to verify that stderr is empty.

    In The Open Group Base Specifications Issue 6, in the specification of the sed utility, it says
    "Implementors are encouraged to provide warning messages about labels that are never used or
    jumps to labels that do not exist." We are following that advice. The standard further states that
    "The standard error shall be used only for diagnostic messages." Such a warning seems clearly to
    qualify as a diagnostic message, so we write it to stderr. The test for Assertion 101 (and any other
    tests that create sed scripts with unused labels) should not expect stderr to be empty.
    Test Output 400|0 101 1 15:02:54|IC Start
    200|0 101 15:02:54|TP Start
    520|0 101 33483 1 1|Assertion #101 (A): Test permitted label length
    520|0 101 33483 2 1|Standard error isn't empty
    520|0 101 33483 2 2|Contents of out.stderr:
    520|0 101 33483 2 3|sed: 6: sed_in_101_1: unused label 'unique_2'
    220|0 101 1 15:02:54|FAIL
    410|0 101 1 15:02:54|IC End

    Review Information

    Review Type TSMA Review
    Start Date 2020-03-31 08:18
    Last Updated 2020-03-31 09:48
    Completed 2020-03-31 09:48
    Status Complete
    Review Recommendation Permanent Interpretation (PIN)
    Review Response XCU6 section 1.11 under STDERR says:

    When this section is listed as "The standard error shall be used only
    for diagnostic messages.", it means that, unless otherwise stated, the
    diagnostic messages shall be sent to the standard error only when the
    exit status is non-zero

    Thus, according to the normative text, sed is not allowed to write
    warning messages (i.e. it must not write anything to stderr when sed's
    exit status is zero). However, in XCU7 the STDERR section for sed has
    changed to say:

    The standard error shall be used only for diagnostic and warning
    messages.

    Therefore this should be considered to be a defect in XCU6 and a
    Permanent Interpretation is recommended.

    Review Type SA Review
    Start Date 2020-03-31 17:48
    Last Updated 2020-03-31 10:02
    Completed 2020-03-31 10:02
    Status Complete
    Review Resolution Permanent Interpretation (PIN)
    Review Conclusion A permanent interpretation is granted.

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