Some constants are missing from the os module on Windows.

http://docs.python.org/lib/os-fd-ops.html falsely
claims that the following O_ constants are present on
Windows:

os.O_NDELAY
os.O_NONBLOCK
os.O_DSYNC
os.O_RSYNC
os.O_SYNC
os.O_NOCTTY

None of these constants are defined in module os on
Windows.

These constants allow file locking (via os.open). 
Currently, there is no cross platform way to lock a
file in Python.

I originally became interested in these constants
because of the following quote from module fcntl:

"The os.open function supports locking flags and is
available on a wider variety of platforms than the
fcntl.lockf and fcntl.flock functions, providing a more
platform-independent file locking facility."

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Changed category to Documentation, since this is a doc bug.  
The O_XXX constants listed here aren't available on Windows 
because Windows itself doesn't support them (and never 
will), so that part of the docs should change.

That doesn't change that these constants may be more 
portable than fcntl gimmicks (are they?  don't know).

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Weird -- a *comment* in the LaTeX source already notes 
that those 6 constants aren't supported on Windows.  Heh.

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Split the 6 non-Windows os.O_XXX constants into a different 
table, and removed the LaTeX comment, in Doc/lib/libos.tex 
rev 1.138.

Leaving this open for someone to investigate the doc's claim 
that these things are more portable than the fcntl gimmicks 
(offhand, doesn't seem likely to me).

The docs claim are wrong.