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      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 run_unittest, reap_children, get_attribute
      8 
      9 # If either of these do not exist, skip this test.
     10 get_attribute(os, 'fork')
     11 get_attribute(os, 'wait4')
     12 
     13 
     14 class Wait4Test(ForkWait):
     15     def wait_impl(self, cpid):
     16         for i in range(10):
     17             # wait4() 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, rusage = os.wait4(cpid, os.WNOHANG)
     20             if spid == cpid:
     21                 break
     22             time.sleep(1.0)
     23         self.assertEqual(spid, cpid)
     24         self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
     25         self.assertTrue(rusage)
     26 
     27 def test_main():
     28     run_unittest(Wait4Test)
     29     reap_children()
     30 
     31 if __name__ == "__main__":
     32     test_main()
     33