Issue #13854: Properly handle non-integer, non-string arg to SystemExit

Previously multiprocessing only expected int or str.  It also wrongly
used an exit code of 1 when the argument was a string instead of zero.

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/multiprocessing/process.py b/Lib/multiprocessing/process.py
index 2b61ee9a0d..3262b50f50 100644
--- a/Lib/multiprocessing/process.py
+++ b/Lib/multiprocessing/process.py
@@ -271,11 +271,11 @@ class Process(object):
         except SystemExit as e:
             if not e.args:
                 exitcode = 1
-            elif type(e.args[0]) is int:
+            elif isinstance(e.args[0], int):
                 exitcode = e.args[0]
             else:
-                sys.stderr.write(e.args[0] + '\n')
-                exitcode = 1
+                sys.stderr.write(str(e.args[0]) + '\n')
+                exitcode = 0 if isinstance(e.args[0], str) else 1
         except:
             exitcode = 1
             import traceback