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Issue #11459: A bufsize value of 0 in subprocess.Popen() really creates

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unbuffered pipes, such that select() works properly on them.
This commit is contained in:
Antoine Pitrou 2011-03-19 17:06:22 +01:00
commit 1679f4daa1
6 changed files with 24 additions and 5 deletions
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16
Lib/test/test_subprocess.py
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@ -1315,6 +1315,22 @@ def test_wait_when_sigchild_ignored(self):
" non-zero with this error:\n%s" %
stderr.decode('utf-8'))
def test_select_unbuffered(self):
# Issue #11459: bufsize=0 should really set the pipes as
# unbuffered (and therefore let select() work properly).
select = support.import_module("select")
p = subprocess.Popen([sys.executable, "-c",
'import sys;'
'sys.stdout.write("apple")'],
stdout=subprocess.PIPE,
bufsize=0)
f = p.stdout
try:
self.assertEqual(f.read(4), b"appl")
self.assertIn(f, select.select([f], [], [], 0.0)[0])
finally:
p.wait()
@unittest.skipUnless(mswindows, "Windows specific tests")
class Win32ProcessTestCase(BaseTestCase):