Need to replicate TIOCGICOUNT and TIOCMIWAIT on cygwin

[Jim Brain <brain at jbrain dot com>]

I have an application that I need to port to windows, and it uses these two 
Linux IOCTLs.  Specifically, the app needs to monitor the DSR line and signal 
another process when it changes. 

I have migrated the rest of the app over with minimal work, but obviously 
cygwin does not support linux/serial.h.  I am OK with a rewrite of this 
function (the rest is working fine), and am also OK writing it in straight 
Win32 calls, but I don't know how to relate my opened fd with a HANDLE to use 
the relevant WIN32 calls. 

Of course, there might be a much easier way to monitor for changes to DSR line, 
so I am up for an alternative (It would be nice to make the code portable to 
*BSD* as well, which means losing this IOCTL), but I am lost at present.  Any 
help would be appreciated.

I can send the current code to anyone who needs it.

Jim Brain


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