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Problem Report 1150 Details

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Report 1150 Actions

    Problem Report Number 1150
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0352
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published null
    Product Standard Sockets (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSU version 4.1.1
    Test Identification Socket/accept 13
    Problem Summary PG4U.00118 This was refused because it is a duplicate. Use TSD4U.00171 instead.
    Problem Text
    Race condition in accept test case #13 AF_UNIX. This test succeeds
    if all the file descriptors are consumed by the server, accept
    returns -1 with EMFILE as errno. However, if the client process
    is scheduled before the server such that the TEMFILE is not created
    by the server yet, client would return ENOENT since O_NONBLOCK is
    set. ENOENT is a valid errno from connect call according to XOPEN
    spec.

    The test suite didn't take care of the ENOENT case in unix_client2()
    shown as follows:

    if (connect(s, (struct sockaddr *) sun2, slen) == -1) {
    if ((errno != ECONNABORTED) && (errno != ECONNREFUSED) &&
    (errno != ECONNRESET) &&
    (((flags & CL_NONBLOCK) == 0) || (errno != EINPROGRESS))) {
    uwerrno("unix_client: connect");
    vsu_debug_exit("capi_sock/unix.c:unix_client2()", 0);
    return(-1);
    }
    }



    If the client gets scheduled before the server creates the TEMPFILE.


    parent child
    ----------------------------------------------------------

    fork

    WAIT_EVENT(PARENT_READY)

    s = socket()
    bind()
    listen()
    POST_EVENT(PARENT_READY)

    s = unix_client2
    socket()
    connect()
    return ENOENT

    consume all available fds
    by create(TEMPFILE, PROT_ALL)
    accept()
    release fds

    Test Output
    TEST CASE: accept

    TEST PURPOSE #13

    SPEC1170TESTSUITE CASE 13
    If the implementation supports a communications
    domain and a connection-oriented socket type:
    EMFILE in errno and return -1 on a call to int
    accept(int socket, struct sockaddr *address, size_t
    *address_len) when OPEN_MAX file descriptors are
    currently open in the calling process.
    PREP: Determine OPEN_MAX
    TEST: AF_INET SOCK_STREAM
    PREP: Create test sockaddr_in: address = 129.214.206.5, port = 4901
    PREP: Child: wait for parent
    PREP: Create a socket
    PREP: Connect socket to address 129.214.206.5, port 4901
    ERROR: inet_client: connect failed, errno = 146(ECONNREFUSED - Connection
    refused)
    PREP: Create socket
    PREP: Bind to socket
    PREP: Call listen for socket
    PREP: Signal child parent is ready
    PREP: Consume all available file descriptors
    TEST: Call accept
    TEST: Return value
    TEST: errno value
    CLEANUP: Close sockets, kill child
    TEST: AF_UNIX SOCK_STREAM
    PREP: Create test sockaddr_un: path = ../tmp/unix.a004p3
    PREP: Child: wait for parent
    PREP: Create socket
    PREP: Set O_NONBLOCK for socket
    PREP: Connect to address ../tmp/unix.a004p3
    ERROR: unix_client: connect failed, errno = 2(ENOENT - No such file or
    directory)
    PREP: Create socket
    PREP: Bind to socket
    PREP: Call listen for socket
    PREP: Signal child parent is ready
    PREP: Consume all available file descriptors
    TEST: Call accept
    TEST: Return value
    TEST: errno value
    CLEANUP: Close sockets, kill child
    UNRESOLVED
    IC End
    TC End
    /tset/CAPIsockets/faccept/faccept1 11:04:10|Clean Start, scenario ref 3-1
    Clean End
    TCC End

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    The submitter is correct but a recent ruling regarding this issue
    exists. To avoid the confusion duplicate rulings regarding the same
    issue might cause we recommend this request be refused and the submitter
    use TSD4U.00171 instead.

    Note that the reason for the failure is the same. The output is
    just different when it affects the AF_UNIX case.

    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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