Protocol Options

After a socket is created, we can tune various options for the different protocols running under that socket.

Use setsockopt() to change socket and protocol options.

Example:

 int s = socket(PF_INET, SOCK_STREAM, 0);

 /* this is the parameter that 'SO_REUSEADDR'     */
 /* requires. different options require different */
 /* parameter types.                              */
 int so_on = 1;

 /* make the system allow address re-usage. */
 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
            (char*)&set_on, sizeof(set_on));