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test_wait4.py
"""This test checks for correct wait4() behavior. """ import os import time import sys import unittest from test.fork_wait import ForkWait from test.support import reap_children, get_attribute # If either of these do not exist, skip this test. get_attribute(os, 'fork') get_attribute(os, 'wait4') class Wait4Test(ForkWait): def wait_impl(self, cpid): option = os.WNOHANG if sys.platform.startswith('aix'): # Issue #11185: wait4 is broken on AIX and will always return 0 # with WNOHANG. option = 0 deadline = time.monotonic() + 10.0 while time.monotonic() <= deadline: # wait4() shouldn't hang, but some of the buildbots seem to hang # in the forking tests. This is an attempt to fix the problem. spid, status, rusage = os.wait4(cpid, option) if spid == cpid: break time.sleep(0.1) self.assertEqual(spid, cpid) self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8)) self.assertTrue(rusage) def tearDownModule(): reap_children() if __name__ == "__main__": unittest.main()