Issue #12196: Add PIPE_MAX_SIZE to test.support, constant larger than the
underlying OS pipe buffer size.
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 2eeff72..686c1b1 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -489,24 +489,21 @@
# 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)