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Problem Report 1053 Details

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Report 1053 Actions

    Problem Report Number 1053
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0290
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published null
    Product Standard Internationalised System Calls and Libraries Extended V2 (UNIX 98)
    Certification Program The Open Brand certification program
    Test Suite VSRT version 5.0.1
    Test Identification rt.os/mqueue/mq_notify 2, 3
    Problem Summary PG4R.00014 These tests may fail due to signals interrupting a semaphore operation.
    Problem Text
    This failures can be caused by a problem with SRC/common/vsrtlib/event.c:

    int vsrt_wait_event(int event, int t)
    {
    struct sembuf mysembuf;
    int save_errno, rval;

    ...

    if (t > 0) {
    got_sigalrm = 0;
    sigemptyset(&(Sigaction.sa_mask));
    Sigaction.sa_handler = vsrt_lsah;
    Sigaction.sa_flags = 0;
    rval = sigaction(SIGALRM,&Sigaction,(struct sigaction *)NULL);
    if (rval == -1) {
    in_rpt("vsrt_wait_event: sigaction failed, errno =
    %s (%
    s), errno, errname(errno)");
    xx_rpt(FAILURE);
    return -1;
    }
    (void) alarm((unsigned int)t);
    }

    line 142 -> rval = semop(semid, &mysembuf, 1);


    ....
    }

    The test code intends to do semaphore operations, but semop() could be
    interrupted by a signal. In that case, semop() will return -1 and
    errno will be set to EINTR.

    suggested fix:

    rval = semop(semid, &mysembuf, 1); <-- line 142
    while (rval == -1 && errno == EINTR) {
    rval = semop(semid, &mysembuf, 1);
    }
    Test Output


    **********************************************************************
    /tset/rt.os/mqueue/mq_notify/T.mq_notify 2 Failed

    Test Description:
    If _POSIX_MESSAGE_PASSING and _POSIX_REALTIME_SIGNALS are defined or
    the implementation supports the mq_notify() function as described in
    System Interfaces and Headers, Issue 5:
    A successful call to mq_notify() when notification->sigev_notify is
    SIGEV_SIGNAL shall cause the signal specified in notification-
    >sigev_signo to be generated for the process upon message arrival at
    the empty message queue associated with mqdes and the process'
    registration for notification shall be removed.

    Test Information:
    message queue did not have any messages
    **********************************************************************

    **********************************************************************
    /tset/rt.os/mqueue/mq_notify/T.mq_notify 3 Failed

    Test Description:
    If _POSIX_MESSAGE_PASSING and _POSIX_REALTIME_SIGNALS are defined or
    the implementation supports the mq_notify() function as described in
    System Interfaces and Headers, Issue 5:
    After a successful call to mq_notify() when notification-
    >sigev_notify is SIGEV_SIGNAL and the SA_SIGINFO flag is set for the
    signal specified in notification->sigev_signo, the signal shall be
    queued for the process when it is generated and the value specified
    in notification->sigev_value shall be in the si_value component of
    the generated signal.

    Test Information:
    message queue did not have any messages
    **********************************************************************


    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.

    The vsrt_wait_event() code goes on after the fragment provided above to
    check the value of rval and if it was -1 an error message starting
    with "vsrt_wait_event: semop failed" would be emitted.

    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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