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It's been a hectic autumn. On december 21st, I finally
got time to test the Python 2.2c1 beta. I found that there
was a problem with fsh, but didn't have time to find out
what the problem was.  Hours later, the news reached me
that Python 2.2 final was released.  Bad timing, I guess.

It turns out that FD_CLOEXEC is set to 1 on every platform
in the known universe (including AIX), so I can work around
the problem.  My code won't look pretty, though:

   Use fcntl.FD_CLOEXEC, if available.
   Otherwise, use FCNTL.FD_CLOEXEC, if available, but
   make sure to turn off the warnings for importing
   FCNTL (if the warnings module is available).
   Otherwise, use 1.