summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_poll.py
blob: a1e5c3dbf8756821a3718edc49fb8d9c6090695c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
# Test case for the os.poll() function

import os
import subprocess
import random
import select
import _testcapi
try:
    import threading
except ImportError:
    threading = None
import time
import unittest
from test.support import TESTFN, run_unittest, reap_threads

try:
    select.poll
except AttributeError:
    raise unittest.SkipTest("select.poll not defined")


def find_ready_matching(ready, flag):
    match = []
    for fd, mode in ready:
        if mode & flag:
            match.append(fd)
    return match

class PollTests(unittest.TestCase):

    def test_poll1(self):
        # Basic functional test of poll object
        # Create a bunch of pipe and test that poll works with them.

        p = select.poll()

        NUM_PIPES = 12
        MSG = b" This is a test."
        MSG_LEN = len(MSG)
        readers = []
        writers = []
        r2w = {}
        w2r = {}

        for i in range(NUM_PIPES):
            rd, wr = os.pipe()
            p.register(rd)
            p.modify(rd, select.POLLIN)
            p.register(wr, select.POLLOUT)
            readers.append(rd)
            writers.append(wr)
            r2w[rd] = wr
            w2r[wr] = rd

        bufs = []

        while writers:
            ready = p.poll()
            ready_writers = find_ready_matching(ready, select.POLLOUT)
            if not ready_writers:
                raise RuntimeError("no pipes ready for writing")
            wr = random.choice(ready_writers)
            os.write(wr, MSG)

            ready = p.poll()
            ready_readers = find_ready_matching(ready, select.POLLIN)
            if not ready_readers:
                raise RuntimeError("no pipes ready for reading")
            rd = random.choice(ready_readers)
            buf = os.read(rd, MSG_LEN)
            self.assertEqual(len(buf), MSG_LEN)
            bufs.append(buf)
            os.close(r2w[rd]) ; os.close( rd )
            p.unregister( r2w[rd] )
            p.unregister( rd )
            writers.remove(r2w[rd])

        self.assertEqual(bufs, [MSG] * NUM_PIPES)

    def test_poll_unit_tests(self):
        # returns NVAL for invalid file descriptor
        FD, w = os.pipe()
        os.close(FD)
        os.close(w)
        p = select.poll()
        p.register(FD)
        r = p.poll()
        self.assertEqual(r[0], (FD, select.POLLNVAL))

        f = open(TESTFN, 'w')
        fd = f.fileno()
        p = select.poll()
        p.register(f)
        r = p.poll()
        self.assertEqual(r[0][0], fd)
        f.close()
        r = p.poll()
        self.assertEqual(r[0], (fd, select.POLLNVAL))
        os.unlink(TESTFN)

        # type error for invalid arguments
        p = select.poll()
        self.assertRaises(TypeError, p.register, p)
        self.assertRaises(TypeError, p.unregister, p)

        # can't unregister non-existent object
        p = select.poll()
        self.assertRaises(KeyError, p.unregister, 3)

        # Test error cases
        pollster = select.poll()
        class Nope:
            pass

        class Almost:
            def fileno(self):
                return 'fileno'

        self.assertRaises(TypeError, pollster.register, Nope(), 0)
        self.assertRaises(TypeError, pollster.register, Almost(), 0)

    # Another test case for poll().  This is copied from the test case for
    # select(), modified to use poll() instead.

    def test_poll2(self):
        cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
                                bufsize=0)
        p = proc.stdout
        pollster = select.poll()
        pollster.register( p, select.POLLIN )
        for tout in (0, 1000, 2000, 4000, 8000, 16000) + (-1,)*10:
            fdlist = pollster.poll(tout)
            if (fdlist == []):
                continue
            fd, flags = fdlist[0]
            if flags & select.POLLHUP:
                line = p.readline()
                if line != b"":
                    self.fail('error: pipe seems to be closed, but still returns data')
                continue

            elif flags & select.POLLIN:
                line = p.readline()
                if not line:
                    break
                self.assertEqual(line, b'testing...\n')
                continue
            else:
                self.fail('Unexpected return value from select.poll: %s' % fdlist)
        p.close()

    def test_poll3(self):
        # test int overflow
        pollster = select.poll()
        pollster.register(1)

        self.assertRaises(OverflowError, pollster.poll, 1 << 64)

        x = 2 + 3
        if x != 5:
            self.fail('Overflow must have occurred')

        pollster = select.poll()
        # Issue 15989
        self.assertRaises(OverflowError, pollster.register, 0,
                          _testcapi.SHRT_MAX + 1)
        self.assertRaises(OverflowError, pollster.register, 0,
                          _testcapi.USHRT_MAX + 1)
        self.assertRaises(OverflowError, pollster.poll, _testcapi.INT_MAX + 1)
        self.assertRaises(OverflowError, pollster.poll, _testcapi.UINT_MAX + 1)

    @unittest.skipUnless(threading, 'Threading required for this test.')
    @reap_threads
    def test_threaded_poll(self):
        r, w = os.pipe()
        self.addCleanup(os.close, r)
        self.addCleanup(os.close, w)
        rfds = []
        for i in range(10):
            fd = os.dup(r)
            self.addCleanup(os.close, fd)
            rfds.append(fd)
        pollster = select.poll()
        for fd in rfds:
            pollster.register(fd, select.POLLIN)

        t = threading.Thread(target=pollster.poll)
        t.start()
        try:
            time.sleep(0.5)
            # trigger ufds array reallocation
            for fd in rfds:
                pollster.unregister(fd)
            pollster.register(w, select.POLLOUT)
            self.assertRaises(RuntimeError, pollster.poll)
        finally:
            # and make the call to poll() from the thread return
            os.write(w, b'spam')
            t.join()


def test_main():
    run_unittest(PollTests)

if __name__ == '__main__':
    test_main()