[Swingosc-devel] sclang udp port choice (was: Re: [sc-users] OSC first-timer problem)

[nescivi <ne...@gm...>]

On Wednesday 23 June 2010 08:29:48 Jonatan Liljedahl wrote:
> James Harkins wrote:
> > On 6/23/10 9:35 AM, da...@da... wrote:
> >>    2. python needs to be told to OSC.OSCClient().connect to the
> >> (localhost-ip, NetAddr.langPort) but each time SC restarts it seems to
> >> have a different langport. How can python find out the langport
> >> dynamically so the routine can work correctly without needing to being
> >> recoded? Should I just write the number to a file, or is there an
> >> elegant way to do it?
> >
> > Oh, PS... this is odd. sclang should be on 57120 by default. If it's
> > choosing a different port each time, maybe one sclang process hasn't
> > released the port before the next one starts?
> 
> This happens to me sometimes on linux, very frustrating.
> 
> You can see what process is holding the port with this terminal command
> (not sure it exists on MacOSX):
> 
> $ lsof -i :57120

ah, useful!

First run of sclang with SwingOSC:

pantometheus% lsof -i :57120 
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sclang  3247 nescivi    3u  IPv4  42848      0t0  UDP *:57120 
sh      3280 nescivi    3u  IPv4  42848      0t0  UDP *:57120 
java    3282 nescivi    3u  IPv4  42848      0t0  UDP *:57120 


After recompile, SwingOSC keeps running, sclang picks a new port:
pantometheus% lsof -i :57120
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sh      3280 nescivi    3u  IPv4  42848      0t0  UDP *:57120 
java    3282 nescivi    3u  IPv4  42848      0t0  UDP *:57120 
pantometheus% lsof -i :57121
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sclang  3304 nescivi    3u  IPv4  44127      0t0  UDP *:57121 


I'm not sure what the "sh" process is and why it has taken the UDP port...
Killing it makes no difference though (keeping SwingOSC running again, and 
recompiling):

pantometheus% lsof -i :57121
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sclang  3365 nescivi    3u  IPv4  45495      0t0  UDP *:57121 
pantometheus% lsof -i :57120
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    3282 nescivi    3u  IPv4  42848      0t0  UDP *:57120 

The curious thing is that SwingOSC is supposed to use TCP on port 57131 
(that's the number I set it to, default is 57111).

So what could cause java to open up 57120?

hmm... this seems to happen here (SwingOSC)?

	bootServerApp {
		var cmd, localAddr;
		// note : the -h option is used again because it significantly speeds
		// up the connection.
		localAddr = NetAddr.localAddr;
		cmd = java + (options.javaOptions ? "") + "-jar \"" ++ program ++ "\" " ++ 
options.asOptionsString( addr.port ) +
			("-h " ++ localAddr.ip ++ ":" ++ localAddr.port);
		("booting " ++ cmd).inform;
		unixCmd( cmd );
	}



sincerely,
Marije