1"""This test checks for correct wait3() behavior.
2"""
3
4import os
5import time
6import unittest
7from test.fork_wait import ForkWait
8from test.test_support import run_unittest, reap_children
9
10try:
11    os.fork
12except AttributeError:
13    raise unittest.SkipTest, "os.fork not defined -- skipping test_wait3"
14
15try:
16    os.wait3
17except AttributeError:
18    raise unittest.SkipTest, "os.wait3 not defined -- skipping test_wait3"
19
20class Wait3Test(ForkWait):
21    def wait_impl(self, cpid):
22        for i in range(10):
23            # wait3() shouldn't hang, but some of the buildbots seem to hang
24            # in the forking tests.  This is an attempt to fix the problem.
25            spid, status, rusage = os.wait3(os.WNOHANG)
26            if spid == cpid:
27                break
28            time.sleep(1.0)
29
30        self.assertEqual(spid, cpid)
31        self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
32        self.assertTrue(rusage)
33
34def test_main():
35    run_unittest(Wait3Test)
36    reap_children()
37
38if __name__ == "__main__":
39    test_main()
40