[Xen-users] choose_vnc_display():

["Brian A. Seklecki" <lavalamp@xxxxxxxxxxxxxxxxxxxxxx>]

All -- we've gotta be careful with assuming formatting output on
netstat(1).  "-tan" is a generally acceptable set of flags, but some
distros separate ipaddr+ports by periods "." instead of colon ":".

All of this out-of-poxis userland+kernel-specific stuff will likely
need a uname(3) wrapper.

~BAS


def choose_vnc_display():
    """Try to choose a free vnc display.
    """
    def netstat_local_ports():
        """Run netstat to get a list of the local ports in use.
        """
        l = os.popen("netstat -nat").readlines()
        r = []
        # Skip 2 lines of header.
        for x in l[2:]:
            # Local port is field 3.
            y = x.split()[3]
            # Field is addr:port, split off the port.
            y = y.split(':')[-1]
            r.append(int(y))
        return r

    ports = [1,10000]
    for d in range(1, 100):
        port = VNC_BASE_PORT + d
        if port in ports: continue
        return d
    return None
vncpid = None



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