Mercurial > cpython-lru_cache-weakref
diff Lib/test/test_subprocess.py @ 68680:7451da272111 3.2
Issue #11459: A `bufsize` value of 0 in subprocess.Popen() really creates
unbuffered pipes, such that select() works properly on them.
| author | Antoine Pitrou <solipsis@pitrou.net> |
|---|---|
| date | Sat, 19 Mar 2011 17:04:13 +0100 |
| parents | ed802f82f07a 1dc52ecb8949 |
| children | 72f6f5a29e7a cb148da52c47 |
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--- a/Lib/test/test_subprocess.py Sat Mar 19 17:45:40 2011 +0800 +++ b/Lib/test/test_subprocess.py Sat Mar 19 17:04:13 2011 +0100 @@ -1216,6 +1216,22 @@ " non-zero with this error:\n%s" % stderr.decode('utf8')) + 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):