C Socket programming problem

This is a discussion on C Socket programming problem within the Networking/Device Communication forums, part of the General Programming Boards category; Hi Guys and Girls... I should imagine it is actually mainly guys here, but best not to be sexist! I ...

  1. #1
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    C Socket programming problem

    Hi Guys and Girls... I should imagine it is actually mainly guys here, but best not to be sexist!

    I have written this code

    Code:
    #include <stdio.h>          /* stderr, stdout */
    #include <sys/socket.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netinet/ip.h> /* superset of previous */
    #include <string.h>
    
    int net_listen() {
        int fn_socket, fn_bind_result;
        fn_socket = socket(AF_INET, SOCK_STREAM, 0);
        if (fn_socket < 0) return -1;
        printf ("net_listen: socket created.\n");
        struct sockaddr_in fn_bind_addr;
        memset(&fn_bind_addr, 0, sizeof(struct sockaddr_in));
        fn_bind_addr.sin_family = AF_INET;
        fn_bind_addr.sin_port = htons(4080);
        fn_bind_addr.sin_addr.s_addr = INADDR_ANY;
        fn_bind_result = bind(fn_socket, &fn_bind_addr, sizeof(struct sockaddr_in));
        if (fn_bind_result < 0) return -1;
        printf ("net_listen: bind success");
    }
    Codeblocks says this when I try to compile it:

    /home/jamie/aws/socket_linux.cpp|18|error: cannot convert ‘sockaddr_in*’ to ‘const sockaddr*’ for argument ‘2’ to ‘int bind(int, const sockaddr*, socklen_t)’|
    Anyone able to tell me the problem?

    Jamie

  2. #2
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    From experience...

    SOCKADDR_IN is a fine way to alias a SOCKADDR struct to get at the bits inside... but it's not a struct you want to be passing around to various functions. Almost none of the socket procedures can use it directly.

    You could try...
    Code:
       fn_bind_result = bind(fn_socket, (sockaddr*)&fn_bind_addr, sizeof(struct sockaddr_in));
    But I ain't makin' no promises.

  3. #3
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    Thumbs up

    my two cents:

    1. from your commandline i suspect you code onto linux, i am not that familiar with linux in include files, on bsd for this to work you will need at least(coding in c not c++)

    Code:
    #include <stdio.h>
    #include <string.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    2. for your socket problem commentater almost had it, if you look into the definition of bind you see it is asking for the struct so give it what it needs:
    Code:
    fn_bind_result = bind(fn_socket, (struct sockaddr *)&fn_bind_addr, sizeof(fn_bind_addr));
    i changed the sizeof as well to the sizeof fn_bind_addr.

    have fun,
    fc

  4. #4
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    I'm working from windows ... yet another OS in the mix.

    In windows sockaddr is a typedef so no need for (struct sockaddr*), in fact I could use (PSOCKADDR) in the cast.

    Changing the size of is a good idea...

  5. #5
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    Talking

    Quote Originally Posted by CommonTater View Post
    I'm working from windows ... yet another OS in the mix.
    right, there were some other OS in the wild

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