addding new libraries to sml-nj

I was thinking about adding a new sml library for pty's since it  
consists of just a few functions and follows the existing posix/tty  
stuff fairly closely, i.e. seems like it would be relatively easy to  
add.

A couple of questions :

1.  is there anything already available (?)  Grepping through source  
did not reveal anything.

2. should libraries be written for inclusion be written using nlffi,  
or the ffi which is currently being used in the distribution.  It  
seems to me that the two methods are incompatible as far as the  
distribution goes, but I'm not sure.

Brian



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