1 """This test checks for correct wait4() behavior.

     2 """

     3 

     4 import os

     5 import time

     6 from test.fork_wait import ForkWait

     7 from test.test_support import TestSkipped, run_unittest, reap_children

     8 

     9 try:

    10     os.fork

    11 except AttributeError:

    12     raise TestSkipped, "os.fork not defined -- skipping test_wait4"

    13 

    14 try:

    15     os.wait4

    16 except AttributeError:

    17     raise TestSkipped, "os.wait4 not defined -- skipping test_wait4"

    18 

    19 class Wait4Test(ForkWait):

    20     def wait_impl(self, cpid):

    21         for i in range(10):

    22             # wait4() shouldn't hang, but some of the buildbots seem to hang

    23             # in the forking tests.  This is an attempt to fix the problem.

    24             spid, status, rusage = os.wait4(cpid, os.WNOHANG)

    25             if spid == cpid:

    26                 break

    27             time.sleep(1.0)

    28         self.assertEqual(spid, cpid)

    29         self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))

    30         self.assertTrue(rusage)

    31 

    32 def test_main():

    33     run_unittest(Wait4Test)

    34     reap_children()

    35 

    36 if __name__ == "__main__":

    37     test_main()