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I fixed the test hanging, but not the actual bug.  The bug
appears when running test_pty after test_openpty.  There's
some interaction, but I don't know what it is.  The problem
happens on AIX also.  I searched through some man pages, but
nothing leapt out at me.  I think I tried googling for the
answer to no avail. Any insight or ideas would be helpful. 
This may have started when adding /dev/ptmx (ptc for AIX)
support.