simple tcp socket programming

[Roger Oberholtzer]

On Tue, 24 Feb 2004 22:25:42 +0800
"M.W. Chang" <mwchang at i-cable.com> wrote:

> 
> Given this code fragment, how could I modify it to bind to a 
> user-specified port, rather than obtaining an available port?
> 
> server.c:
> 
>     /* open socket */
>     sock = socket(PF_INET, SOCK_STREAM , 0);
>     if (sock < 0) {
>          perror("server: Error opening stream socket");
>          exit(1);
>     }
> 
>     server.sin_family = PF_INET;
>     server.sin_addr.s_addr = INADDR_ANY;
>     server.sin_port = 0;

      server.sin_port = htons((short) port);

      /* Set any socket/protocol options */
      int on = 1;
      setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on));

>     if (bind(sock, (struct sockaddr *)&server, sizeof server) < 0) {
>          perror("server: Error binding server socket to message socket");
>          exit(1);
>     }
> 
>     /* obtain the first availble port */
>     length = sizeof server;
>     if (getsockname(sock, (struct sockaddr *)&server, &length)<0) {
>          perror("server: Error obtaining socket name");
>          exit(1);
>     }
>     listen(sock,5);
> 
> 
> -- 
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> 
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