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

happens when the end exits before the beginning.

issue7678 - Properly document how to replace a shell pipeline so that SIGPIPE
happens when the end exits before the beginning.
e09d2f16 · Gregory P. Smith · 738236db · e09d2f16
Kaydet (Commit) e09d2f16 authored Şub 05, 2011 tarafından Gregory P. Smith
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subprocess.rst Doc/library/subprocess.rst +3 -0

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--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -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`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^