# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1481499213 -3600
# Node ID 4a9521f666e96808dfc05507f9d6c18cd2510f45
# Parent  333e1b23f4e47f6d4990de9f81a2a65dbc1b8376
Added attributes to OSError instances.

diff -r 333e1b23f4e4 -r 4a9521f666e9 lib/__builtins__/exception/system.py
--- a/lib/__builtins__/exception/system.py	Sun Dec 11 18:33:09 2016 +0100
+++ b/lib/__builtins__/exception/system.py	Mon Dec 12 00:33:33 2016 +0100
@@ -20,7 +20,18 @@
 """
 
 class EnvironmentError(Exception): pass
-class OSError(Exception): pass
+
+class OSError(Exception):
+
+    "A general operating system error."
+
+    def __init__(self, value, arg):
+
+        "Initialise the exception with the given error 'value' and 'arg'."
+
+        self.value = value
+        self.arg = arg
+
 class RuntimeError(Exception): pass
 class RuntimeWarning(Warning): pass
 class SystemError(Exception): pass