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# Test case for the os.poll() function
import os, select, random, unittest
from test.test_support import TestSkipped, TESTFN, run_unittest
try:
select.poll
except AttributeError:
raise TestSkipped("select.poll not defined -- skipping test_poll")
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 poll_unit_tests(self):
# returns NVAL for invalid file descriptor
FD = 42
try:
os.close(FD)
except OSError:
pass
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'
p = os.popen(cmd, 'r')
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 != "":
self.fail('error: pipe seems to be closed, but still returns data')
continue
elif flags & select.POLLIN:
line = p.readline()
if not line:
break
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')
def test_main():
run_unittest(PollTests)
if __name__ == '__main__':
test_main()
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