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issue7678 - Properly document how to replace a shell pipeline so that SIGPIPE

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happens when the end exits before the beginning.
This commit is contained in:
Gregory P. Smith 2011-02-05 21:47:25 +00:00
parent 738236dbd6
commit e09d2f1614
1 changed files with 3 additions and 0 deletions
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3
Doc/library/subprocess.rst
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@ -519,8 +519,11 @@ Replacing shell pipeline
==>
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
p1.stdout.close() # Allow p1 to receive a SIGPIPE if p2 exits.
output = p2.communicate()[0]
The p1.stdout.close() call after starting the p2 is important in order for p1
to receive a SIGPIPE if p2 exits before p1.
Replacing :func:`os.system`
^^^^^^^^^^^^^^^^^^^^^^^^^^^