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gh-98552: flush std streams in the multiprocessing forkserver before fork (#141849)

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* flush std streams in the multiprocessing forkserver before fork

* NEWS
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Gregory P. Smith 2025-11-22 10:29:51 -08:00 • committed by GitHub
parent 08477dbf30
commit 58badb1711
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1
Lib/multiprocessing/forkserver.py
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@ -326,6 +326,7 @@ def sigchld_handler(*_unused):
len(fds)))
child_r, child_w, *fds = fds
s.close()
util._flush_std_streams()
pid = os.fork()
if pid == 0:
# Child

4
Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst Normal file
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@ -0,0 +1,4 @@
The :mod:`multiprocessing` forkserver process now flushes stdout and stderr
before it forks to avoid the confusion children inheriting any buffered but
not yet written output data. Normally there is none, but when using
:func:`multiprocessing.set_forkserver_preload` there *could* be.