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Problem Report 0159 Details

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Report 0159 Actions

    Problem Report Number 0159
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0159
    Raised 1994-06-10 08:00
    Updated 2003-03-13 08:00
    Published 1994-06-14 08:00
    Product Standard Internationalised System Calls and Libraries (XPG4)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.3.2
    Test Identification POSIX.os/ioprim/write 12
    Linked Problem Reports PG3.623, (in, old, system)
    Problem Summary TSD4.159 This test fails due to the incorrect assumption as to when a write to a pipe will continue after being blocked. On our system a blocked write will not continue until the amount of data in the pipe dro...
    Problem Text

    This test fails due to the incorrect assumption as to when a write to
    a pipe will continue after being blocked. On our system a blocked
    write will not continue until the amount of data in the pipe drops below
    a low water mark. This test fails because the amount of data in the
    pipe never falls below this low water mark. Specifically, the test
    fills the pipe and then attempts to write an additional number of
    bytes to the pipe expecting the write to block. This succeeds. The
    child then reads 5k bytes and expects the write to continue, however,
    at this point, the writer will not wake up because the low water mark
    has not been reached. The parent process hangs and times out resulting
    in the EINTR errno.

    There is nothing in either the XPG4 or P1003.1 stating at what point the
    write will continue. The only reasonable assumption is that emptying
    the pipe will unblock the blocked writes.

    Test Output

    ************************************************************************
    /tset/POSIX.os/ioprim/write/T.write 12 Failed

    Test Description:
    For the XNFS specification:
    Not in use.
    For the XSH specification:
    When writing {PIPE_BUF} or fewer bytes to a pipe or FIFO for which
    the O_NONBLOCK is clear, the calling process will block until
    space is available to complete the write operation
    Posix Ref: Component WRITE Assertion 6.4.2.2-20(A)
    Posix Ref: Component PATHCONF Assertion 5.7.1.2-40(A)

    Test Strategy:
    REPEAT for FIFO and pipe:
    WRITE to FIFO/pipe until no more data can be transferred
    CREATE process pair
    PARENT process:
    WRITE pipe_buf bytes to FIFO/pipe
    CHILD process:
    SLEEP for WAITTIME/2
    READ pipe_buf bytes from FIFO/pipe
    PARENT process:
    VERIFY that write() returns pipe_buf bytes

    Test Information:
    write() returned -1, expected 5120
    errno was set to 4 (EINTR)
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This is accepted as a fault in the test suite and it is recommended that
    a waiver is granted on the grounds of a test suite deficiency.

    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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