[SOCKET] socket reuse example

1. bsd case

int on = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
{
perror("setsockopt(SO_REUSEADDR) failed");
}

2. python case

sock = socket.socket( socket.AF_INET, socket.SOCK_STREAM )

# Enable the SO_REUSEADDR option
sock.setsockopt( socket.SOL_SOCKET, socket.SO_REUSEADDR, 1 )

# Get the size of the socket's send buffer
bufsize = sock.getsockopt( socket.SOL_SOCKET, socket.SO_SNDBUF )

# Get the state of the SO_REUSEADDR option
state = sock.getsockopt( socket.SOL_SOCKET, socket.SO_REUSEADDR )