Gregory P. Smith added the comment:

adding {0,1,2} to fds_to_keep (populated from pass_fds) is indeed an alternate 
approach.  A variant of an alternate patch doing that attached.

This actually simplifies code.  Is there anything this would hurt that i'm not 
seeing?

I suppose it adds minor overhead to the fork_exec() call by passing more in and 
lookups into the fds_to_keep list now that it will always contain at least 4 
values instead of the previous 1.  I doubt that is matters (I haven't measured 
anything).

----------
Added file: 
http://bugs.python.org/file32830/issue15798_alternate-pass_fds-gps01.diff

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