Thread: getsockname() bad address error

  1. #1
    Registered User
    Join Date
    Apr 2004

    getsockname() bad address error

    I'm trying to retrieve the random port number the kernel assigned to my socket. Unfortunately getsockname() keeps throwing a bad address error and I have no idea why.... Hopefully someone can provide some assistance.

    Below is the code segment:
        struct sockaddr_in target, me;
        int rc, sd;
        /* set target struct info*/
        target.sin_family = target_address->h_addrtype;
        memcpy((char *) &target.sin_addr.s_addr, 
                target_address->h_addr_list[0], target_address->h_length);
        target.sin_port = target_port;
        /* create socket */
        if ((sd = socket(AF_INET, SOCK_DGRAM, 0)) == -1){
        /* bind socket to random port */
        me.sin_family = AF_INET;
        me.sin_addr.s_addr = INADDR_ANY;
        me.sin_port = 0;
        if ((bind(sd, (struct sockaddr *) &me, sizeof(me))) == -1){
        /* connect UDP socket */
        if ((rc = connect(sd, (struct sockaddr *) &target, sizeof(target)))){
        /* get random port */
        if (getsockname(sd, (struct sockaddr *) &me, (int *)sizeof(me)) == -1){
        printf("Listening on port %d\n", me.sin_port);

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > (int *)sizeof(me)
    This should be a pointer to a variable (of whatever type) containing the value sizeof(me)

    socklen_t foo = sizeof(me);
    getsockname(sd, (struct sockaddr *) &me, &foo )
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    Registered User
    Join Date
    Apr 2004
    Ah! much thanks.

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