Merged revisions 88352 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k
........
r88352 | gregory.p.smith | 2011-02-05 13:47:25 -0800 (Sat, 05 Feb 2011) | 3 lines
issue7678 - Properly document how to replace a shell pipeline so that SIGPIPE
happens when the end exits before the beginning.
........
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index c490203..e333309 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -465,8 +465,11 @@
==>
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`
^^^^^^^^^^^^^^^^^^^^^^^^^^^