def test_orphaned_signal_watcher(self):
# Install libev-based signal watcher.
s = gevent.signal(signal.SIGTERM, signals_test_sigterm_handler)
# Normal behavior: signal handlers become inherited by children.
# Bogus behavior of libev-based signal watchers in child process:
# They should not be active anymore when 'orphaned' (when their
# corresponding event loop has been destroyed). What happens, however:
# The old handler stays active and registering a new handler does not
# 'overwrite' the old one -- both are active.
# Since this test is about testing the behavior of 'orphaned' libev
# signal watchers, the signal must be transmitted *after* event loop
# recreation, so wait here for the child process to go through
# the hub & event loop destruction (and recreation) process before
# sending the signal. Waiting is realized with sync through pipe.
# Without cleanup code in gipc, the inherited but orphaned libev signal
# watcher would be active in the fresh event loop and trigger the
# handler. This is a problem. With cleanup code, this handler must
# never be called. Child exitcode 20 means that the inherited handler
# has been called, -15 (-signal.SIGTERM) means that the child was
# actually killed by SIGTERM within a certain short time interval.
# Returncode 0 would mean that the child finished normally after that
# short time interval.
with pipe() as (r, w):
p = start_process(signals_test_child_a, (w,))
assert r.get() == p.pid
os.kill(p.pid, signal.SIGTERM)
p.join()
if not WINDOWS:
assert p.exitcode == -signal.SIGTERM
else:
assert p.exitcode == signal.SIGTERM
s.cancel()
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