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Problem Report 1232 Details

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Report 1232 Actions

    Problem Report Number 1232
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0434
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published null
    Product Standard Internationalised System Calls and Libraries Extended (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSU version 4.0.2
    Test Identification BASE/sigstack 4 8
    Problem Summary PG4U.00031 A non-zero value of ss_onstack should be permitted to disable an alternate stack.
    Problem Text
    Test 4 fails because it assumes that a non-zero value of
    ss_onstack enables the alternate stack. The sigstack spec
    merely states that

    the value of ss_onstack determines whether the alternate stack is
    sed, but it doesn't state what the value should be.

    HP-UX has implemented a non-zero value of ss_onstack to indicate that
    the alternate stack is DISabled. The test should not be testing this
    implementation-dependent choice. However, the test could run twice,
    pass in 0 and non-0 values, and make sure that the alternate stack is
    enabled in only one case.

    Test 8 fails for a similar reason. It initially disables use of the
    alternate stack when it thinks it's really enabling it. It should
    determine which value of ss_onstack really enables the alternate
    stack before proceeding with the rest of the test.
    Test Output
    TEST CASE: sigstack

    TEST PURPOSE #4
    A call to int sigstack(struct sigstack *ss , struct
    sigstack *oss) when the ss_onstack member of ss is
    non-zero shall indicate to the system that the process
    wants the system to use an alternate signal stack when
    delivering signals.
    PREP: Call sigstack(ss, oss) with ss_onstack non-zero
    PREP: Call sigaction() with SA_ONSTACK set
    PREP: Send self SIGTERM
    TEST: Verify alternate stack used
    ERROR: Auto declaration was outside boundaries of declared stack
    Declared Top of Stack = 4000f7c8
    Declared End of Stack = 4000b7c8
    Received Auto Address = 7b03aac8
    4 FAIL

    TEST PURPOSE #8
    EPERM in errno and return -1 on call to int
    sigstack(struct sigstack *ss , struct sigstack *oss)
    when an attempt is made to modify an active stack.
    PREP: Call sigstack(ss, oss)
    PREP: Call sigaction() with SA_ONSTACK set
    PREP: Send self SIGTERM
    TEST: Call sigstack(ss, oss) with new parameters
    ERROR: sisgstack() returned 0 with errno 0(0 - No error)
    Expected -1 with errno EPERM
    8 FAIL

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We recommend this request be refused.

    ss_onstack is a sigstack structure member. The signal.h spec states

    The <signal.h> header defines the sigstack structure
    that includes at least the following members:

    int ss_onstack non-zero when signal stack is in use

    We believe this mandates that ss_onstack must be non-zero when
    the the stack is enabled.

    Although not normative, this is also consistent with existing
    practice. Allowing an implementation to invert the semantics
    here would make application portability impossible.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Rejected (REJ)
    Review Conclusion
    This request is refused.

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