bpo-45643: Add signal.SIGSTKFLT on platforms where this is defined (GH-29266)

Author: gareth-rees

Doc/library/signal.rst

@@ -197,6 +197,16 @@ The variables defined in the :mod:`signal` module are:
 
    Segmentation fault: invalid memory reference.
 
+.. data:: SIGSTKFLT
+
+    Stack fault on coprocessor. The Linux kernel does not raise this signal: it
+    can only be raised in user space.
+
+   .. availability:: Linux, on architectures where the signal is available. See
+      the man page :manpage:`signal(7)` for further information.
+
+   .. versionadded:: 3.11
+
 .. data:: SIGTERM
 
    Termination signal.

Misc/NEWS.d/next/Library/2021-10-28-11-40-59.bpo-45643.jeiPiX.rst

@@ -0,0 +1 @@
+Added :data:`signal.SIGSTKFLT` on platforms where this signal is defined.

Modules/signalmodule.c

@@ -1554,6 +1554,9 @@ signal_add_constants(PyObject *module)
 #ifdef SIGINFO
     ADD_INT_MACRO(SIGINFO);
 #endif
+#ifdef SIGSTKFLT
+    ADD_INT_MACRO(SIGSTKFLT);
+#endif
 
     // ITIMER_xxx constants
 #ifdef ITIMER_REAL