[NaCl SDK] Add keyboard interrupt handlers for python scripts

native_client_sdk/src/tools/create_nmf.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import errno
 import hashlib
 import json
 import optparse
 import os
@@ skipping 617 matching lines @@
     Trace.verbose = True
   if options.debug_mode:
     DebugPrint.debug_mode = True
 
   if options.toolchain is not None:
     print 'warning: option -t/--toolchain is deprecated.'
 
   if len(args) < 1:
     raise Error('No nexe files specified.  See --help for more info')
 
+  for filename in args:
+    if not os.path.exists(filename):
+      raise Error('Input file not found: %s' % filename)
+    if not os.path.isfile(filename):
+      raise Error('Input is not a file: %s' % filename)
+
   canonicalized = ParseExtraFiles(options.extra_files, sys.stderr)
   if canonicalized is None:
     parser.error('Bad --extra-files (-x) argument syntax')
 
   remap = {}
   for ren in options.name:
     parts = ren.split(',')
     if len(parts) != 2:
       raise Error('Expecting --name=<orig_arch.so>,<new_name.so>')
     remap[parts[0]] = parts[1]
@@ skipping 29 matching lines @@
   return 0
 
 
 # Invoke this file directly for simple testing.
 if __name__ == '__main__':
   try:
     rtn = main(sys.argv[1:])
   except Error, e:
     sys.stderr.write('%s: %s\n' % (os.path.basename(__file__), e))
     rtn = 1
+  except KeyboardInterrupt:
+    sys.stderr.write('%s: interrupted\n' % os.path.basename(__file__))
+    rtn = 1
   sys.exit(rtn)