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101 lines
3.3 KiB
101 lines
3.3 KiB
3 years ago
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import errno
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import os
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import select
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import subprocess
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import sys
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import textwrap
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import unittest
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from test import support
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@unittest.skipIf((sys.platform[:3]=='win'),
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"can't easily test on this system")
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class SelectTestCase(unittest.TestCase):
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class Nope:
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pass
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class Almost:
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def fileno(self):
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return 'fileno'
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def test_error_conditions(self):
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self.assertRaises(TypeError, select.select, 1, 2, 3)
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self.assertRaises(TypeError, select.select, [self.Nope()], [], [])
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self.assertRaises(TypeError, select.select, [self.Almost()], [], [])
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self.assertRaises(TypeError, select.select, [], [], [], "not a number")
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self.assertRaises(ValueError, select.select, [], [], [], -1)
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# Issue #12367: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/155606
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@unittest.skipIf(sys.platform.startswith('freebsd'),
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'skip because of a FreeBSD bug: kern/155606')
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def test_errno(self):
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with open(__file__, 'rb') as fp:
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fd = fp.fileno()
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fp.close()
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try:
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select.select([fd], [], [], 0)
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except OSError as err:
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self.assertEqual(err.errno, errno.EBADF)
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else:
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self.fail("exception not raised")
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def test_returned_list_identity(self):
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# See issue #8329
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r, w, x = select.select([], [], [], 1)
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self.assertIsNot(r, w)
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self.assertIsNot(r, x)
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self.assertIsNot(w, x)
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@unittest.skipUnless(hasattr(os, 'popen'), "need os.popen()")
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def test_select(self):
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code = textwrap.dedent('''
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import time
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for i in range(10):
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print("testing...", flush=True)
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time.sleep(0.050)
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''')
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cmd = [sys.executable, '-I', '-c', code]
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with subprocess.Popen(cmd, stdout=subprocess.PIPE) as proc:
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pipe = proc.stdout
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for timeout in (0, 1, 2, 4, 8, 16) + (None,)*10:
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if support.verbose:
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print(f'timeout = {timeout}')
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rfd, wfd, xfd = select.select([pipe], [], [], timeout)
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self.assertEqual(wfd, [])
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self.assertEqual(xfd, [])
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if not rfd:
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continue
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if rfd == [pipe]:
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line = pipe.readline()
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if support.verbose:
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print(repr(line))
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if not line:
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if support.verbose:
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print('EOF')
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break
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continue
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self.fail('Unexpected return values from select():',
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rfd, wfd, xfd)
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# Issue 16230: Crash on select resized list
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def test_select_mutated(self):
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a = []
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class F:
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def fileno(self):
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del a[-1]
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return sys.__stdout__.fileno()
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a[:] = [F()] * 10
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self.assertEqual(select.select([], a, []), ([], a[:5], []))
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def test_disallow_instantiation(self):
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support.check_disallow_instantiation(self, type(select.poll()))
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if hasattr(select, 'devpoll'):
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support.check_disallow_instantiation(self, type(select.devpoll()))
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def tearDownModule():
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support.reap_children()
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if __name__ == "__main__":
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unittest.main()
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