[MACTCL] [send] on OS X.

[Revar D. <rev...@gm...>]

My program Trebuchet currently attempts to open a server socket at  
startup.  If the socket is already bound (if the program was run  
twice), the new process sends a message to the server socket asking  
the first process to do the task the new process was going to do,  
then the new process exits.  This lets me have one instance of the  
program handle external requests via command-line.  ie:

     trebtk --connect domain1.com:8888    ;#(Starts Treb, connects to  
domain1.com)
     trebtk --connect domain2.com:5201    ;#(Causes first Treb  to  
also connect to domain2.com)

This implementation is, to put it nicely... inelegant and ugly as  
hell, and probably a security issue.

So I went to rewrite it with the [send] command.

Under OS X, the comments in file tkMacOSXSend.c pretty much say that  
[send] will _not_ currently work for inter process communications on  
the Mac.  It further goes on to suggest how to implement it.  So I'm  
thinking, sure, I'll see if I can figure that out.  It suggests that  
Tk needs to record it's appnames using a Gestalt(), to keep a system- 
side table for appname to processes id lookups.  So I go reading  
docs.  The docs for the Gestalt Manager say, though, that under OS X,  
Gestalt() is per process, so you _can't_ use Gestalt() to do the  
storage for this.

If Gestalt() is unworkable (and deprecated, no less), what is the  
suggested OS X way to keep a system-wide table of tcl appnames?  A  
shared memmap file somewhere?

     - Revar