From:	mike AT mbsun DOT mlb DOT org (Mike Bernson)
Subject:	Non blocking I/O
17 May 1997 14:52:01 -0700 :
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I am trying to set the the non-block read or write for a 
tcp-socket.

I do the following fcntl(fd, SETFL, O_NONBLOCK) which does not
return any errors. Then a do a read on the fd and it blocks. 

I need a way to do none blocking reads or find out how much data
is pending so I can do the read for just that amount of data.

The same would be nice for writes but not needed.
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