[PATCH] Maintain outgoing TCP meta buffer

[Scott Lamb]

Here's a patch that does the steps I mentioned in my last email:

- remove BlockingTCP
- make send_meta return true on EWOULDBLOCK
- add logic to main_loop to watch for write availability of meta  
connections with non-empty buffers and flush them.

It fixes the extra packets with TCPOnly and should resolve the  
problems that made BlockingTCP necessary also. (No testing of that  
last bit.)

The buffer management is a bit dumb:

- it never shrinks the buffer
- it copies stuff around more than necessary

but it's probably not worth fixing unless someone actually encounters  
problems. The copying is inefficient, but it's probably negligible  
compared to doing encryption.

It also only flushes after cycling the main loop, so it may even  
double the iterations of the main loop. So it's probably worth adding  
some flushes earlier on. This was the simplest thing that works, though.

-- 
Scott Lamb <http://www.slamb.org/>


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