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bpo-30057: Fix potential missed signal in signal.signal(). (GH-4258) (#4261)

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Bug report and patch by Jeroen Demeyer.
(cherry picked from commit f6f90ff079)
This commit is contained in:
Miss Islington (bot) 2017-11-03 12:23:12 -07:00 • committed by Antoine Pitrou
parent b5f09acf0a
commit ea80ae04e2
3 changed files with 6 additions and 1 deletions
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1
Misc/ACKS
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@ -358,6 +358,7 @@ Vincent Delft
Arnaud Delobelle
Konrad Delong
Erik Demaine
Jeroen Demeyer
Martin Dengler
John Dennis
L. Peter Deutsch

1
Misc/NEWS.d/next/Library/2017-11-03-19-11-43.bpo-30057.NCaijI.rst Normal file
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@ -0,0 +1 @@
Fix potential missed signal in signal.signal().

5
Modules/signalmodule.c
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@ -462,12 +462,15 @@ signal_signal_impl(PyObject *module, int signalnum, PyObject *handler)
}
else
func = signal_handler;
/* Check for pending signals before changing signal handler */
if (PyErr_CheckSignals()) {
return NULL;
}
if (PyOS_setsig(signalnum, func) == SIG_ERR) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
old_handler = Handlers[signalnum].func;
_Py_atomic_store_relaxed(&Handlers[signalnum].tripped, 0);
Py_INCREF(handler);
Handlers[signalnum].func = handler;
if (old_handler != NULL)