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"""This test checks for correct wait4() behavior.
"""
import os
import time
import sys
import unittest
from test.fork_wait import ForkWait
from test import support
# If either of these do not exist, skip this test.
support.get_attribute(os, 'fork')
support.get_attribute(os, 'wait4')
class Wait4Test(ForkWait):
def wait_impl(self, cpid, *, exitcode):
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() + support.SHORT_TIMEOUT
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, exitcode << 8,
"cause = %d, exit = %d" % (status&0xff, status>>8))
self.assertTrue(rusage)
def tearDownModule():
support.reap_children()
if __name__ == "__main__":
unittest.main()
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