1 """This test checks for correct fork() 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_fork1"

    13 

    14 class ForkTest(ForkWait):

    15     def wait_impl(self, cpid):

    16         for i in range(10):

    17             # waitpid() shouldn't hang, but some of the buildbots seem to hang

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

    19             spid, status = os.waitpid(cpid, os.WNOHANG)

    20             if spid == cpid:

    21                 break

    22             time.sleep(1.0)

    23 

    24         self.assertEqual(spid, cpid)

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

    26 

    27 def test_main():

    28     run_unittest(ForkTest)

    29     reap_children()

    30 

    31 if __name__ == "__main__":

    32     test_main()