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Problem Report 1230 Details

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Report 1230 Actions

    Problem Report Number 1230
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0432
    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 CAPIbase/ftwnftw 1 24
    Problem Summary PG4U.00033 The test does not properly test the number of fds used by ftw().
    Problem Text
    Both of these tests that the allocation of file descripters are sequential
    numbers. The lowest file descriptor is allocated but since a number may have
    been skipped the method used by the test suite to determine the number of
    file descriptors used is inaccurate. The specification does not require that
    these interfaces compensate for file descripters that may have been used by
    the operating system on the behalf of the process.
    Test Output
    TEST CASE: ftw

    TEST PURPOSE #1
    A call to int ftw(const char *path, int (*fn)(const
    char *, const struct stat *ptr, int flag), int ndirs)
    shall use at most one file descriptor for each level
    in the file tree.
    PREP: Determine which file descriptors should be used
    TEST: No more than 1 file descriptor used per directory
    ERROR: Too many file descriptors used
    1 FAIL

    also

    TEST CASE: nftw

    TEST PURPOSE #24
    A call to int nftw(const char *path, int (*fn)(const
    char *, const struct stat *, int, struct FTW *), int
    depth, int flags) shall use at most one file
    descriptor for each directory level.
    PREP: Create path
    TEST: No more than 1 file descriptor is used in traversal
    INFO: Call to fn() at ../tmp/data/dirh
    INFO: Call to fn() at ../tmp/data/dirh/dir_left.1
    INFO: Call to fn() at ../tmp/data/dirh/dir_left.1/dir_left.2
    ERROR: expected no more than 3 fds to be used, 4 used

    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.

    We believe the tests are correct.

    Using the ftw test as an example...

    The test determines how many initial file descriptors are open
    then calls ftw() to walk a heirarchy.

    The per object function provided (which is called for each object
    in the hierarchy) does an open and close to get the next available
    fd. Since the XSH open() spec states

    The open() function will return a file descriptor for the named
    file that is the lowest file descriptor not currently open for
    that process. ...

    this fd is guaranteed represent the number of fds used.

    Since the net number of fds used by the function is 0 and the
    function is called by ftw() the difference between the number of
    fds used at that point and the initial number of fds in use
    before the ftw() call must be attributed to the ftw() call.

    The ftw() spec states

    The ftw() function uses at most one file descriptor for each
    level in the tree.

    The test compares the number of fds used to the maximum depth
    of the hierarchy being searched. If this number is exceeded the
    test fails.

    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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