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bpo-30654: Do not reset SIGINT handler to SIG_DFL in finisignal #2162

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bpo-30654: Do not reset SIGINT handler to SIG_DFL in finisignal #2162

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4 changes: 4 additions & 0 deletions Misc/NEWS
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,10 @@ What's New in Python 2.7.14?
Core and Builtins
-----------------

- bpo-30654: Fixed reset of the SIGINT handler to SIG_DFL on interpreter
shutdown even when there was a custom handler set previously. Patch by
Philipp Kerling.

- bpo-27945: Fixed various segfaults with dict when input collections are
mutated during searching, inserting or comparing. Based on patches by
Duane Griffin and Tim Mitchell.
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14 changes: 2 additions & 12 deletions Modules/signalmodule.c
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Expand Up @@ -95,13 +95,6 @@ static PyObject *DefaultHandler;
static PyObject *IgnoreHandler;
static PyObject *IntHandler;

/* On Solaris 8, gcc will produce a warning that the function
declaration is not a prototype. This is caused by the definition of
SIG_DFL as (void (*)())0; the correct declaration would have been
(void (*)(int))0. */

static PyOS_sighandler_t old_siginthandler = SIG_DFL;

#ifdef HAVE_GETITIMER
static PyObject *ItimerError;

Expand Down Expand Up @@ -622,7 +615,7 @@ initsignal(void)
/* Install default int handler */
Py_INCREF(IntHandler);
Py_SETREF(Handlers[SIGINT].func, IntHandler);
old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
PyOS_setsig(SIGINT, signal_handler);
}

#ifdef SIGHUP
Expand Down Expand Up @@ -865,14 +858,11 @@ finisignal(void)
int i;
PyObject *func;

PyOS_setsig(SIGINT, old_siginthandler);
old_siginthandler = SIG_DFL;

for (i = 1; i < NSIG; i++) {
func = Handlers[i].func;
Handlers[i].tripped = 0;
Handlers[i].func = NULL;
if (i != SIGINT && func != NULL && func != Py_None &&
if (func != NULL && func != Py_None &&
func != DefaultHandler && func != IgnoreHandler)
PyOS_setsig(i, SIG_DFL);
Py_XDECREF(func);
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