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Problem Report 0340 Details

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This page provides all information on Problem Report 0340.

Report 0340 Actions

    Problem Report Number 0340
    Submitter's Classification Specification problem
    State Resolved
    Resolution Permanent Interpretation (PIN)
    Problem Resolution ID PIN.X.0056
    Raised 1996-02-05 08:00
    Updated 2003-03-13 08:00
    Published 1996-03-06 08:00
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite Unknown version N/A
    Test Identification N/A
    Specification System Interfaces and Headers Issue 4
    Location in Spec See Problem Text
    Problem Summary PIN4.056 BACKGROUND: This interpretation relates to the shared memory interface defined in XPG4 The size argument to shmget() is used to specify the size of a shared memory segment. In the X/Open specification...
    Problem Text

    BACKGROUND:
    This interpretation relates to the shared memory interface defined in XPG4
    The size argument to shmget() is used to specify the size of a shared memory
    segment.
    In the X/Open specification, the size argument type is a size_t.
    Shmctl() provides an option to get the size of an existing shared memory
    segment.
    The size is returned in the shm_segsz field of the shmid_ds structure.
    X/Open specifies the type of shm_segsz to be an int.

    OBSERVATION:
    The two variables do not have the same type. This appear to be an error
    introduced
    at the time the interface was adopted into XPG4.

    INTERPRETATION:
    We request an interpretation that implementations where shm_segsz is of type
    size_t is ALSO
    accepted as compliant.
    Test Output

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This interpretation does not reference any test failures or provide any
    test results which suggests that this is not currently causing a problem
    with the test suites or with applications.

    The change would only affect systems where the size_t type is set to a value
    different from int, in which case there is the possibility of truncation on
    assignment from the structure element to/from the function argument. It is
    not believed that this is likely to be an issue on 32 bit systems, but is
    likely to be an issue with 64 bit systems where it is more likely that the
    sizes of int and size_t would differ.

    The change certainly seems sensible, but this is really in the province of the
    Base working group to provide a recommendation. I would suggest that this is
    forwarded for a 14 day review.

    No Discussion comments in this Review.


    Review Type Expert Group Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution No Resolution Given
    Review Conclusion
    The Base WG recommends that a PIN be granted for this issue. The group
    recommends that a future revision of XSH will specify shm_segsz as a type
    size_t.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Permanent Interpretation (PIN)
    Review Conclusion
    A Permanent Interpretation is granted.

    Problem Reporting System Options:

     

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