Merge pull request #34 from gocept/icemac-WindowsError-2.13

Don't bail on WindowsError which is not existing on non-windows systems.

doc/CHANGES.rst

@@ -8,7 +8,8 @@ http://docs.zope.org/zope2/
 2.13.24 (unreleased)
 --------------------
 
-- TBD
+- Issue #34: Fix ``NameError`` exception for ``WindowsError`` which could
+  happen on non-windows systems.
 
 2.13.23 (2015-06-29)
 --------------------

src/Zope2/Startup/__init__.py

@@ -27,6 +27,12 @@ from ZConfig.components.logger import loghandler
 from zope.event import notify
 from zope.processlifetime import ProcessStarting
 
+try:
+    IO_ERRORS = (IOError, WindowsError)
+except NameError:
+    IO_ERRORS = (IOError,)
+
+
 logger = logging.getLogger("Zope")
 started = False
 
@@ -283,7 +289,7 @@ class ZopeStarter:
                 lock_file(self.lockfile)
                 self.lockfile.write(str(os.getpid()))
                 self.lockfile.flush()
-            except (IOError, WindowsError):
+            except IO_ERRORS:
                 pass
 
     def makePidFile(self):
@@ -295,7 +301,7 @@ class ZopeStarter:
                 f = open(self.cfg.pid_filename, 'w')
                 f.write(str(os.getpid()))
                 f.close()
-            except (IOError, WindowsError):
+            except IO_ERRORS:
                 pass
 
     def unlinkPidFile(self):