How to close all files between fork and exec?

[Aahz Maruch]

In article <yv27l3upooj.fsf at lionsp093.lion-ag.de>,
Harald Kirsch  <kirschh at lionbioscience.com> wrote:
>
>Python has fork/exec. I want to use it. After fork and before exec I
>would like the child process to close all files other than 0, 1 and 2
>(i.e. standard input/output/error). 

Why not simply keep track of all open files in a dict or list?
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