Address already in use

This is a discussion on Address already in use within the Linux Programming forums, part of the Platform Specific Boards category; Hi All, Got a problem restarting my server: bind: Address already in use I start it like: Code: srv.sin_addr.s_addr = ...

  1. #1
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    Address already in use

    Hi All,

    Got a problem restarting my server:

    bind: Address already in use

    I start it like:
    Code:
                           srv.sin_addr.s_addr = INADDR_ANY;
                            srv.sin_port = htons( port);
                            srv.sin_family = AF_INET;
    
                            sock_opt = 1;
                            if(setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(void *)&sock_opt,sizeof(sock_opt)) == -1)
                            {
                                    perror("setsockopt(SO_REUSEADDR)");
                                    close(s);
                                    return 3;
                            }
    
                            if(bind(s,(struct sockaddr *)&srv,sizeof(srv)) == -1)
                            {
                                    perror("bind");
                                    close(s);
                                    return 4;
                            }
    
                            if(listen(s,3) == -1)
                            {
                                    perror("listen");
                                    close(s);
                                    return 5;
                            }
    So it should be reusing the socket.

    Had a look in nestat and:
    Code:
    tcp       25      0 localhost:5580          localhost:40353         CLOSE_WAIT
    tcp       48      0 localhost:5580          localhost:40352         CLOSE_WAIT
    tcp       25      0 localhost:5580          localhost:40361         CLOSE_WAIT
    tcp       48      0 localhost:5580          localhost:40360         CLOSE_WAIT
    Connections in CLOSE_WAIT state.

    Any ideas how I can get round this?

    Cheers, rotis23

  2. #2
    End Of Line Hammer's Avatar
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    so_resuse should do the trick.

    Do you have something like
    memset(&(srv.sin_zero), '\0', 8);

    I presume sock_opt is an int?
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
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    Hi Hammer,

    When you say so_resuse, you are agreeing with SO_REUSEADDR?

    Hmm. I don't memset anything, only this before previously posted code:
    Code:
    int s, sock_opt, client, cli_size, pid, res, result = 0;
    struct sockaddr_in srv, cli;
    
    //fork code
    
                            //signal handler code
    
                            s = socket(AF_INET, SOCK_STREAM, 0);
                            if(s == -1)
                            {
                                    perror("socket");
                                    return 2;
                            }
    Should I be more careful here?

  4. #4
    End Of Line Hammer's Avatar
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    >>When you say so_resuse, you are agreeing with SO_REUSEADDR?
    Yes

    >>memset
    Yes, you should be memset()'ing.
    Sample:
    http://personal.windsofstorm.net/tserver.c
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  5. #5
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    I see.

    Thanks Hammer.

  6. #6
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    I had a look around after your last post and noticed that there are:

    SO_REUSEADDR
    SO_REUSEPORT

    From this thread I guess SO_REUSEPORT is not needed because it allows multiple processes to bind to the same address:

    http://www.unixguide.net/network/socketfaq/4.11.shtml

    I'm also not sure if this is implemented on RedHat Linux systems or if it's just BSD.

  7. #7
    End Of Line Hammer's Avatar
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    So, are you fixed or not?
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  8. #8
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    Not sure - going to do some load testing tomorrow and see if I can reproduce.

    I've added the memset though.

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