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Problem Report 0299 Details

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Report 0299 Actions

    Problem Report Number 0299
    Submitter's Classification Specification problem
    State Resolved
    Resolution Permanent Interpretation (PIN)
    Problem Resolution ID PIN.X.0015
    Raised 1993-12-16 08:00
    Updated 2003-03-13 08:00
    Published 1993-12-22 08:00
    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/devclass/c_iflag 19
    Specification System Interfaces and Headers Issue 4
    Location in Spec See Problem Text
    Linked Problem Reports PIN4.010, (in, old, system)
    Problem Summary PIN4.015 . Summary of tests failed: POSIX.os/devclass/c_iflag 19 Our system (SVR4 based) does not support locally connected asynchronous terminals. In order to run VSX tests, we use a pseudo-tty loopback to si...
    Problem Text
    .
    Summary of tests failed:

    POSIX.os/devclass/c_iflag 19

    Our system (SVR4 based) does not support locally connected asynchronous
    terminals. In order to run VSX tests, we use a pseudo-tty loopback to simulate
    the hardware terminal interface. Because of the limitations on software
    simulation, hardware related features are not supported, such as parity
    generation/detection, character size, and START/STOP characters.

    This failure is related to the hardware features of a asynchronous
    terminal. For this reason, we request a waiver for it.
    Test Output

    ************************************************************************
    /tset/POSIX.os/devclass/c_iflag/T.c_iflag 19 Failed

    Test Description:
    If general terminal interface supported:
    When IXOFF is set the system shall transmit one or more STOP
    characters as needed to prevent the number of characters in the
    input queue from exceeding its capacity. The system shall transmit
    one or more START characters as needed to start transmitting data.
    CONDITIONAL: If _POSIX_MAX_INPUT <= MAX_INPUT <= PCTS_MAX_INPUT
    assertion is base (type C) otherwise assertion is extended (type
    D).
    Posix Ref: Component Settable Parameters Assertion 7.1.2.2-32(C:D)
    Posix Ref: Component Settable Parameters Assertion 7.1.2.2-33(C:D)

    Test Strategy:
    OPEN and initialise terminal file and loop back file (having SAME
    parity)
    OBTAIN max_input from fpathconf(tty_fildes, _PC_MAX_INPUT)
    SET IXON, VMIN=0 and VTIME=10 in loop back control flags
    CLEAR ICANON in loop back control flags
    SET IXOFF, VMIN=0 and VTIME=10 in terminal control flags
    CLEAR ICANON in terminal control flags
    CREATE child process
    UNTIL a timeout occurs
    SET TIMEOUT of WAITTIME/2 seconds
    WRITE string to loop back file
    FLUSH output queue on loop back file using tcflush(fd, TCOFLUSH)
    READ entire input queue from terminal file
    SET capacity to the greater of the number of bytes read and
    max_input
    CLEAR IXON in loop back control flags
    UNTIL capacity bytes have been written
    WRITE string to loop back file
    SLEEP to allow data to transfer to terminal file
    READ from loop back file
    VERIFY that read() read at least one STOP character
    UNTIL capacity bytes have been read or a read error occurs
    READ from terminal file
    SLEEP to allow more data to become available
    VERIFY that capacity bytes in total were read
    READ from loop back file
    VERIFY that read() read at least one START character

    Test Information:
    after input queue filled to 1598 bytes, attempt
    to read() STOP character(s) returned 0, expected >= 1
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    It is accepted that flow control is not necessarily supported by the use of
    START and STOP characters across a pseudo-tty loopback. A permanent
    interpretation is recommended.

    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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