tcflush hang problem

[H. Henning Schmidt]

I am pretty certain the the problem which is discussed in this thread 
has already been reported in
http://sources.redhat.com/ml/cygwin/2003-03/msg01529.html

There is obviously an input buffer, which overflows if you keep an open 
filedesc. on a serial port and let some external system generate input 
data on that port while your own app does not read them away from there 
fast enough. The message referenced above (from March 2003) also 
contains a reliable way to reproduce this problem. My guess is, that the 
tcflush() itself is probably not guilty in any way, it just helps 
reproducing the problem.

;Henning



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