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Problem Report 0401 Details

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Report 0401 Actions

    Problem Report Number 0401
    Submitter's Classification Specification problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0020
    Raised 1993-05-05 08:00
    Updated 2003-03-13 08:00
    Published null
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.2.4
    Test Identification POSIX.os/ioprim/fcntl 9
    Problem Summary PG4R.020 Therefore the Interpretation Request VWG/008/063092 exists, in which the item "OPEN RESOLUTION" tells: The X/Open proposed behaviour is a temporary interpretation pending resolution by the IEEE. The "...
    Problem Text
    Therefore the Interpretation Request VWG/008/063092 exists, in which
    the item "OPEN RESOLUTION" tells:
    The X/Open proposed behaviour is a temporary interpretation pending
    resolution by the IEEE.
    The "Test Suite Status" tells:
    Retain a documented grey area where it has not yet been resolved and
    X/Open's recommendation was to leave the tests as they are.
    Test Output
    400|156 9 1 18:06:07|IC Start
    200|156 9 18:06:07|TP Start
    520|156 9 12932 1 1|fcntl(F_GETLK) on write-locked file did not set lock struct
    fields properly
    220|156 9 1 18:06:07|FAIL
    410|156 9 1 18:06:07|IC End

    ************************************************************************
    /tset/POSIX.os/ioprim/fcntl/T.fcntl 9 Failed

    Test Description:
    A call to fcntl(fildes, F_GETLK, arg) shall provide a description of
    the first file lock for the file fildes which blocks the lock
    description pointed to by arg by overwriting the original lock
    description contained in arg with a new lock description containing
    the following information:
    (i) the lock type l_type is set to type of file lock which blocks
    the original lock description;
    (ii) the value l_whence is set to SEEK_SET;
    (iii) the value l_start is set to the offset of the blocking lock
    relative to the start of the file;
    (iv) the value l_len is set to the length of locked area;
    (v) the value l_pid is set to the process-id of the process that
    created the lock.
    When l_whence is one of SEEK_SET, SEEK_CUR, SEEK_END
    Posix Ref: Component FCNTL Assertion 6.5.2.2-14(A)

    Test Strategy:
    OPEN new file using creat()
    WRITE 40 bytes to file
    SET lock {F_WRLCK, SEEK_SET, 10, 15, 0} using fcntl(F_SETLK)
    SET lock {F_WRLCK, SEEK_END, -10, 5, 0} using fcntl(F_SETLK)
    CREATE child process
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_SET,
    0, 37, 0} gives lock description {F_WRLCK, SEEK_SET, 10, 15,
    getppid()}
    SET the current file pointer to 20 using lseek()
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_CUR,
    -10, 37, 0} gives lock description {F_WRLCK, SEEK_SET, 10, 15,
    getppid()}
    VERIFY that fcntl(F_GETLK) with lock description {F_RDLCK, SEEK_END,
    -30, 37, 0} gives lock description {F_WRLCK, SEEK_SET, 10, 15,
    getppid()}

    Test Information:
    fcntl(F_GETLK) on write-locked file did not set lock struct fields
    properly
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    The cited interpretation deals with the coalescing of locks which is agreed
    not to be necessary. However, according to the strategy shown above the
    locks are applied to the regions from byte 10 to 24 and from byte 30 to 34.
    Since these regions are not adjacent, the locks will not be subject to
    possible coalescing and the argument cited in VWG/008/063092 will not apply.
    It is also noted that this interpretation was raised against VSX3.205 but
    not against the test number for which this interpretation is requested.
    It is not recommended that this request be granted on the evidence
    provided.

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

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