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Problem Report 2699 Details

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Report 2699 Actions

    Problem Report Number 2699
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.1413
    Raised 2018-08-02 03:23
    Updated 2018-08-02 09:54
    Published 2018-08-02 09:54
    Product Standard Internationalised System Calls and Libraries Extended V3 (UNIX 03)
    Certification Program The Open Brand certification program
    Test Suite VSX4 version 4.7.14
    Test Identification ANSI.os/genuts/system_X/T.system_X 52
    Specification Base Definitions Issue 6
    Location in Spec http://pubs.opengroup.org/onlinepubs/9699919799/functions/system.html
    Problem Summary VSX test /tset/ANSI.os/genuts/system_X/T.system_X 52 makes unwarranted
    assumptions
    Problem Text We think this test is invalid. It is legal to return -1/ECHILD from
    system(). According to the
    specification at
    http://pubs.opengroup.org/onlinepubs/9699919799/functions/system.html:

    ERRORS

    [CX] [Option Start] The system() function may set errno values as
    described by fork. [Option End]

    In addition, system() may fail if:

    [ECHILD]
    [CX] [Option Start] The status of the child process created by system()
    is no longer available.
    [Option End]

    This test essentially does the following:

    int rc;

    signal(SIGCHLD, SIG_IGN);

    rc = system("exit 0");
    if (rc < 0) {
    perror("system");
    }

    The call signal(SIGCHLD, SIG_IGN) ignores SIGCHLD signals, which causes
    the system to not
    create zombies. Since zombies are the means by which the exit status of
    a process is preserved
    until one of the waitX() calls is made, this call makes the exit status
    unavailable, thereby triggering
    the exclusion. The same applies when using sigaction() with sa_flags set
    to SA_NOCLDWAIT.

    The call to system() does indeed wait for the child to terminate. The
    waiting is done using wait4().
    Test Output 400|100 52 1 16:38:34|IC Start
    520|100 52 00079864 5 1|testing with SIGCHLD ignored ...
    520|100 52 00079864 7 1|system() returned -1, expected 0
    520|100 52 00079864 7 2|errno was set to 10 (ECHILD)
    520|100 52 00079864 9 1|testing with SIGCHLD handler and SA_NOCLDWAIT
    set ...
    520|100 52 00079864 11 1|system() returned -1, expected 0
    520|100 52 00079864 11 2|errno was set to 10 (ECHILD)
    220|100 52 2 16:38:49|UNRESOLVED
    410|100 52 1 16:38:49|IC End

    Review Information

    Review Type TSMA Review
    Start Date 2018-08-02 03:23
    Last Updated 2018-08-02 09:19
    Completed 2018-08-02 09:19
    Status Complete
    Review Recommendation Test Suite Deficiency (TSD)
    Review Response This is accepted as a fault in the test suite.

    Review Type SA Review
    Start Date 2018-08-02 17:19
    Last Updated 2018-08-02 09:49
    Completed 2018-08-02 09:49
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion The recommended resolution was given as Test Suite Deficiency (TSD).

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