os.popen() interferes with os.fork()?

Hrvoje Niksic hniksic at xemacs.org
Mon Aug 25 21:10:54 CEST 2008

JohnMudd <JohnBMudd at gmail.com> writes:

> On Linux I get a "close failed: [Errno 10] No child processes" msg
> for each fork.  But only if I have a pipe open.  I don't understand
> the connection between the popen and the forks.  Am I doing
> something wrong?

Yes: don't use sys.exit, use os._exit.  This is not specific to
Python; in C you'd also need to use _exit(2) in preference to exit(3)
to exit a forked process.

With sys.exit(0) changed to os._exit(0), the program outputs:

rate: 2962.1 fork/sec

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