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"""This test checks for correct wait4() behavior.
"""
import os
import time
from test.fork_wait import ForkWait
from test.support import run_unittest, reap_children
try:
os.fork
except AttributeError:
raise unittest.SkipTest("os.fork not defined -- skipping test_wait4")
try:
os.wait4
except AttributeError:
raise unittest.SkipTest("os.wait4 not defined -- skipping test_wait4")
class Wait4Test(ForkWait):
def wait_impl(self, cpid):
for i in range(10):
# 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, os.WNOHANG)
if spid == cpid:
break
time.sleep(1.0)
self.assertEqual(spid, cpid)
self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
self.assertTrue(rusage)
def test_main():
run_unittest(Wait4Test)
reap_children()
if __name__ == "__main__":
test_main()
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