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from test import test_support
import unittest
import select
import os
import sys
@unittest.skipIf(sys.platform[:3] in ('win', 'os2', 'riscos'),
"can't easily test on this system")
class SelectTestCase(unittest.TestCase):
class Nope:
pass
class Almost:
def fileno(self):
return 'fileno'
def test_error_conditions(self):
self.assertRaises(TypeError, select.select, 1, 2, 3)
self.assertRaises(TypeError, select.select, [self.Nope()], [], [])
self.assertRaises(TypeError, select.select, [self.Almost()], [], [])
self.assertRaises(TypeError, select.select, [], [], [], "not a number")
def test_returned_list_identity(self):
# See issue #8329
r, w, x = select.select([], [], [], 1)
self.assertIsNot(r, w)
self.assertIsNot(r, x)
self.assertIsNot(w, x)
def test_select(self):
cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
p = os.popen(cmd, 'r')
for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
if test_support.verbose:
print 'timeout =', tout
rfd, wfd, xfd = select.select([p], [], [], tout)
if (rfd, wfd, xfd) == ([], [], []):
continue
if (rfd, wfd, xfd) == ([p], [], []):
line = p.readline()
if test_support.verbose:
print repr(line)
if not line:
if test_support.verbose:
print 'EOF'
break
continue
self.fail('Unexpected return values from select():', rfd, wfd, xfd)
p.close()
# Issue 16230: Crash on select resized list
def test_select_mutated(self):
a = []
class F:
def fileno(self):
del a[-1]
return sys.__stdout__.fileno()
a[:] = [F()] * 10
result = select.select([], a, [])
# CPython: 'a' ends up with 5 items, because each fileno()
# removes an item and at the middle the iteration stops.
# PyPy: 'a' ends up empty, because the iteration is done on
# a copy of the original list: fileno() is called 10 times.
if test_support.check_impl_detail(cpython=True):
self.assertEqual(len(result[1]), 5)
self.assertEqual(len(a), 5)
if test_support.check_impl_detail(pypy=True):
self.assertEqual(len(result[1]), 10)
self.assertEqual(len(a), 0)
def test_main():
test_support.run_unittest(SelectTestCase)
test_support.reap_children()
if __name__ == "__main__":
test_main()
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