From 0190bfad1366ba93030169e2e49b92d06e7db4ef 2013-10-29 23:32:43
From: MinRK <benjaminrk@gmail.com>
Date: 2013-10-29 23:32:43
Subject: [PATCH] clarify exit status / signal status comment

in _process_posix
---

diff --git a/IPython/utils/_process_posix.py b/IPython/utils/_process_posix.py
index 4e778f2..9c6054f 100644
--- a/IPython/utils/_process_posix.py
+++ b/IPython/utils/_process_posix.py
@@ -187,7 +187,9 @@ class ProcessHandler(object):
 
         # We follow the subprocess pattern, returning either the exit status
         # as a positive number, or the terminating signal as a negative
-        # number. sh returns 128+n for signals
+        # number.
+        # on Linux, sh returns 128+n for signals terminating child processes on Linux
+        # on BSD (OS X), the signal code is set instead
         if child.exitstatus is None:
             # on WIFSIGNALED, pexpect sets signalstatus, leaving exitstatus=None
             if child.signalstatus is None: