[orca/gnome-3-20] Don't try to catch SIGSEGV; use faulthandler to dump output from crash

[Joanmarie Diggs <joanied src gnome org>]

commit dfede1743dc3b74800823c28e15e9dabd646ad6e
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Wed Jun 1 14:20:43 2016 -0400

    Don't try to catch SIGSEGV; use faulthandler to dump output from crash
    
    Now when AT-SPI2 causes us to die from an illegal operation, we should
    die properly.

 src/orca/orca.py |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)
---
diff --git a/src/orca/orca.py b/src/orca/orca.py
index aee13a1..3785f9e 100644
--- a/src/orca/orca.py
+++ b/src/orca/orca.py
@@ -29,6 +29,7 @@ __copyright__ = "Copyright (c) 2004-2009 Sun Microsystems Inc." \
                 "Copyright (c) 2012 Igalia, S.L."
 __license__   = "LGPL"
 
+import faulthandler
 import gi
 import importlib
 import os
@@ -763,12 +764,6 @@ def shutdownOnSignal(signum, frame):
     if not cleanExit:
         die(EXIT_CODE_HANG)
 
-def abortOnSignal(signum, frame):
-    debug.println(debug.LEVEL_ALL,
-                  "Aborting due to signal = %d" \
-                  % signum)
-    die(signum)
-
 def main(cacheValues=True):
     """The main entry point for Orca.  The exit codes for Orca will
     loosely be based on signals, where the exit code will be the
@@ -776,6 +771,11 @@ def main(cacheValues=True):
     an exit code of 0 means normal completion and an exit code of 50
     means Orca exited because of a hang."""
 
+    if debug.debugFile and os.path.exists(debug.debugFile.name):
+        faulthandler.enable(file=debug.debugFile, all_threads=False)
+    else:
+        faulthandler.enable(all_threads=False)
+
     # Method to call when we think something might be hung.
     #
     settings.timeoutCallback = timeout
@@ -786,7 +786,6 @@ def main(cacheValues=True):
     signal.signal(signal.SIGINT, shutdownOnSignal)
     signal.signal(signal.SIGTERM, shutdownOnSignal)
     signal.signal(signal.SIGQUIT, shutdownOnSignal)
-    signal.signal(signal.SIGSEGV, abortOnSignal)
 
     if not _settingsManager.isAccessibilityEnabled():
         _settingsManager.setAccessibility(True)