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1from test import test_support
2import unittest
3import select
4import os
5import sys
6
7@unittest.skipIf(sys.platform[:3] in ('win', 'os2', 'riscos'),
8                 "can't easily test on this system")
9class SelectTestCase(unittest.TestCase):
10
11    class Nope:
12        pass
13
14    class Almost:
15        def fileno(self):
16            return 'fileno'
17
18    def test_error_conditions(self):
19        self.assertRaises(TypeError, select.select, 1, 2, 3)
20        self.assertRaises(TypeError, select.select, [self.Nope()], [], [])
21        self.assertRaises(TypeError, select.select, [self.Almost()], [], [])
22        self.assertRaises(TypeError, select.select, [], [], [], "not a number")
23
24    def test_returned_list_identity(self):
25        # See issue #8329
26        r, w, x = select.select([], [], [], 1)
27        self.assertIsNot(r, w)
28        self.assertIsNot(r, x)
29        self.assertIsNot(w, x)
30
31    def test_select(self):
32        cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
33        p = os.popen(cmd, 'r')
34        for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
35            if test_support.verbose:
36                print 'timeout =', tout
37            rfd, wfd, xfd = select.select([p], [], [], tout)
38            if (rfd, wfd, xfd) == ([], [], []):
39                continue
40            if (rfd, wfd, xfd) == ([p], [], []):
41                line = p.readline()
42                if test_support.verbose:
43                    print repr(line)
44                if not line:
45                    if test_support.verbose:
46                        print 'EOF'
47                    break
48                continue
49            self.fail('Unexpected return values from select():', rfd, wfd, xfd)
50        p.close()
51
52    # Issue 16230: Crash on select resized list
53    def test_select_mutated(self):
54        a = []
55        class F:
56            def fileno(self):
57                del a[-1]
58                return sys.__stdout__.fileno()
59        a[:] = [F()] * 10
60        self.assertEqual(select.select([], a, []), ([], a[:5], []))
61
62def test_main():
63    test_support.run_unittest(SelectTestCase)
64    test_support.reap_children()
65
66if __name__ == "__main__":
67    test_main()
68