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[3.8] bpo-38323: Add guard clauses in MultiLoopChildWatcher. (GH-22756) #23807

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Dec 16, 2020
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[3.8] bpo-38323: Add guard clauses in MultiLoopChildWatcher. (GH-22756) #23807

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32 changes: 18 additions & 14 deletions Lib/asyncio/unix_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1152,13 +1152,15 @@ def is_active(self):

def close(self):
self._callbacks.clear()
if self._saved_sighandler is not None:
handler = signal.getsignal(signal.SIGCHLD)
if handler != self._sig_chld:
logger.warning("SIGCHLD handler was changed by outside code")
else:
signal.signal(signal.SIGCHLD, self._saved_sighandler)
self._saved_sighandler = None
if self._saved_sighandler is None:
return

handler = signal.getsignal(signal.SIGCHLD)
if handler != self._sig_chld:
logger.warning("SIGCHLD handler was changed by outside code")
else:
signal.signal(signal.SIGCHLD, self._saved_sighandler)
self._saved_sighandler = None

def __enter__(self):
return self
Expand All @@ -1185,15 +1187,17 @@ def attach_loop(self, loop):
# The reason to do it here is that attach_loop() is called from
# unix policy only for the main thread.
# Main thread is required for subscription on SIGCHLD signal
if self._saved_sighandler is not None:
return

self._saved_sighandler = signal.signal(signal.SIGCHLD, self._sig_chld)
if self._saved_sighandler is None:
self._saved_sighandler = signal.signal(signal.SIGCHLD, self._sig_chld)
if self._saved_sighandler is None:
logger.warning("Previous SIGCHLD handler was set by non-Python code, "
"restore to default handler on watcher close.")
self._saved_sighandler = signal.SIG_DFL
logger.warning("Previous SIGCHLD handler was set by non-Python code, "
"restore to default handler on watcher close.")
self._saved_sighandler = signal.SIG_DFL

# Set SA_RESTART to limit EINTR occurrences.
signal.siginterrupt(signal.SIGCHLD, False)
# Set SA_RESTART to limit EINTR occurrences.
signal.siginterrupt(signal.SIGCHLD, False)

def _do_waitpid_all(self):
for pid in list(self._callbacks):
Expand Down