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233 lines
7.2 KiB
Python
233 lines
7.2 KiB
Python
# Test case for the os.poll() function
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import os
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import subprocess
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import random
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import select
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import threading
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import time
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import unittest
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from test.support import TESTFN, run_unittest, reap_threads, cpython_only
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try:
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select.poll
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except AttributeError:
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raise unittest.SkipTest("select.poll not defined")
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def find_ready_matching(ready, flag):
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match = []
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for fd, mode in ready:
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if mode & flag:
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match.append(fd)
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return match
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class PollTests(unittest.TestCase):
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def test_poll1(self):
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# Basic functional test of poll object
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# Create a bunch of pipe and test that poll works with them.
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p = select.poll()
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NUM_PIPES = 12
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MSG = b" This is a test."
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MSG_LEN = len(MSG)
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readers = []
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writers = []
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r2w = {}
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w2r = {}
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for i in range(NUM_PIPES):
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rd, wr = os.pipe()
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p.register(rd)
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p.modify(rd, select.POLLIN)
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p.register(wr, select.POLLOUT)
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readers.append(rd)
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writers.append(wr)
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r2w[rd] = wr
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w2r[wr] = rd
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bufs = []
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while writers:
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ready = p.poll()
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ready_writers = find_ready_matching(ready, select.POLLOUT)
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if not ready_writers:
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raise RuntimeError("no pipes ready for writing")
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wr = random.choice(ready_writers)
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os.write(wr, MSG)
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ready = p.poll()
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ready_readers = find_ready_matching(ready, select.POLLIN)
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if not ready_readers:
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raise RuntimeError("no pipes ready for reading")
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rd = random.choice(ready_readers)
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buf = os.read(rd, MSG_LEN)
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self.assertEqual(len(buf), MSG_LEN)
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bufs.append(buf)
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os.close(r2w[rd]) ; os.close( rd )
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p.unregister( r2w[rd] )
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p.unregister( rd )
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writers.remove(r2w[rd])
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self.assertEqual(bufs, [MSG] * NUM_PIPES)
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def test_poll_unit_tests(self):
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# returns NVAL for invalid file descriptor
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FD, w = os.pipe()
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os.close(FD)
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os.close(w)
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p = select.poll()
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p.register(FD)
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r = p.poll()
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self.assertEqual(r[0], (FD, select.POLLNVAL))
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with open(TESTFN, 'w') as f:
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fd = f.fileno()
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p = select.poll()
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p.register(f)
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r = p.poll()
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self.assertEqual(r[0][0], fd)
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r = p.poll()
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self.assertEqual(r[0], (fd, select.POLLNVAL))
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os.unlink(TESTFN)
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# type error for invalid arguments
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p = select.poll()
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self.assertRaises(TypeError, p.register, p)
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self.assertRaises(TypeError, p.unregister, p)
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# can't unregister non-existent object
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p = select.poll()
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self.assertRaises(KeyError, p.unregister, 3)
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# Test error cases
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pollster = select.poll()
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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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self.assertRaises(TypeError, pollster.register, Nope(), 0)
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self.assertRaises(TypeError, pollster.register, Almost(), 0)
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# Another test case for poll(). This is copied from the test case for
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# select(), modified to use poll() instead.
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def test_poll2(self):
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cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
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proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
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bufsize=0)
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proc.__enter__()
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self.addCleanup(proc.__exit__, None, None, None)
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p = proc.stdout
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pollster = select.poll()
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pollster.register( p, select.POLLIN )
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for tout in (0, 1000, 2000, 4000, 8000, 16000) + (-1,)*10:
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fdlist = pollster.poll(tout)
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if (fdlist == []):
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continue
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fd, flags = fdlist[0]
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if flags & select.POLLHUP:
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line = p.readline()
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if line != b"":
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self.fail('error: pipe seems to be closed, but still returns data')
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continue
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elif flags & select.POLLIN:
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line = p.readline()
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if not line:
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break
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self.assertEqual(line, b'testing...\n')
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continue
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else:
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self.fail('Unexpected return value from select.poll: %s' % fdlist)
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def test_poll3(self):
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# test int overflow
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pollster = select.poll()
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pollster.register(1)
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self.assertRaises(OverflowError, pollster.poll, 1 << 64)
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x = 2 + 3
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if x != 5:
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self.fail('Overflow must have occurred')
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# Issues #15989, #17919
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self.assertRaises(ValueError, pollster.register, 0, -1)
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self.assertRaises(OverflowError, pollster.register, 0, 1 << 64)
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self.assertRaises(ValueError, pollster.modify, 1, -1)
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self.assertRaises(OverflowError, pollster.modify, 1, 1 << 64)
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@cpython_only
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def test_poll_c_limits(self):
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from _testcapi import USHRT_MAX, INT_MAX, UINT_MAX
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pollster = select.poll()
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pollster.register(1)
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# Issues #15989, #17919
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self.assertRaises(OverflowError, pollster.register, 0, USHRT_MAX + 1)
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self.assertRaises(OverflowError, pollster.modify, 1, USHRT_MAX + 1)
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self.assertRaises(OverflowError, pollster.poll, INT_MAX + 1)
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self.assertRaises(OverflowError, pollster.poll, UINT_MAX + 1)
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@reap_threads
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def test_threaded_poll(self):
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r, w = os.pipe()
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self.addCleanup(os.close, r)
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self.addCleanup(os.close, w)
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rfds = []
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for i in range(10):
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fd = os.dup(r)
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self.addCleanup(os.close, fd)
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rfds.append(fd)
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pollster = select.poll()
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for fd in rfds:
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pollster.register(fd, select.POLLIN)
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t = threading.Thread(target=pollster.poll)
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t.start()
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try:
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time.sleep(0.5)
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# trigger ufds array reallocation
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for fd in rfds:
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pollster.unregister(fd)
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pollster.register(w, select.POLLOUT)
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self.assertRaises(RuntimeError, pollster.poll)
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finally:
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# and make the call to poll() from the thread return
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os.write(w, b'spam')
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t.join()
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@unittest.skipUnless(threading, 'Threading required for this test.')
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@reap_threads
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def test_poll_blocks_with_negative_ms(self):
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for timeout_ms in [None, -1000, -1, -1.0, -0.1, -1e-100]:
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# Create two file descriptors. This will be used to unlock
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# the blocking call to poll.poll inside the thread
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r, w = os.pipe()
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pollster = select.poll()
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pollster.register(r, select.POLLIN)
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poll_thread = threading.Thread(target=pollster.poll, args=(timeout_ms,))
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poll_thread.start()
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poll_thread.join(timeout=0.1)
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self.assertTrue(poll_thread.is_alive())
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# Write to the pipe so pollster.poll unblocks and the thread ends.
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os.write(w, b'spam')
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poll_thread.join()
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self.assertFalse(poll_thread.is_alive())
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os.close(r)
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os.close(w)
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def test_main():
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run_unittest(PollTests)
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if __name__ == '__main__':
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test_main()
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