gh-98552: Fix preloading '__main__' with forkserver being broken for a #99515
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…n for a long time (9 years). We do this by using spawn.get_preparation_data() and then using the values in that dictionary appropriately. This lets us also fix the setting of sys.path (which never worked) and other minor properties of the forkserver process. While updating the test to verify these fixes, we also discovered that forkserver was not flushing stdout/stderr before it forked to create a new process. This caused the updated test to fail because unflushed output in the forkserver would then be printed by the forked process as well. This is now fixed too.
aggieNick02
requested review from
brettcannon,
encukou,
ericsnowcurrently,
ncoghlan,
warsaw and
1st1
as code owners
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One minor thing I noticed incase @pitrou remembers from several years ago. In |
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@aggieNick02 I suppose it's a simple check that |
Ah ok, thanks! |
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long time (9 years).
We do this by using spawn.get_preparation_data() and then using the values in that dictionary appropriately. This lets us also fix the setting of sys.path (which never worked) and other minor properties of the forkserver process.
While updating the test to verify these fixes, we also discovered that forkserver was not flushing stdout/stderr before it forked to create a new process. This caused the updated test to fail because unflushed output in the forkserver would then be printed by the forked process as well. This is now fixed too.