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Issue #12196: Add PIPE_MAX_SIZE to test.support, constant larger than the

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underlying OS pipe buffer size.
This commit is contained in:
Charles-François Natali 2011-05-29 16:36:44 +02:00
parent b30eed981f
commit 2d51721832
3 changed files with 13 additions and 9 deletions
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11
Lib/test/test_subprocess.py
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@ -489,24 +489,21 @@ class ProcessTestCase(BaseTestCase):
# This test will probably deadlock rather than fail, if
# communicate() does not work properly.
x, y = os.pipe()
if mswindows:
pipe_buf = 512
else:
pipe_buf = os.fpathconf(x, "PC_PIPE_BUF")
os.close(x)
os.close(y)
p = subprocess.Popen([sys.executable, "-c",
'import sys,os;'
'sys.stdout.write(sys.stdin.read(47));'
'sys.stderr.write("xyz"*%d);'
'sys.stdout.write(sys.stdin.read())' % pipe_buf],
'sys.stderr.write("x" * %d);'
'sys.stdout.write(sys.stdin.read())' %
support.PIPE_MAX_SIZE],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
self.addCleanup(p.stdin.close)
string_to_write = b"abc"*pipe_buf
string_to_write = b"a" * support.PIPE_MAX_SIZE
(stdout, stderr) = p.communicate(string_to_write)
self.assertEqual(stdout, string_to_write)