WTF NPAPI extension. Early draft.

tools/nixysa/nixysa/locking.py

Index: tools/nixysa/nixysa/locking.py
===================================================================
--- tools/nixysa/nixysa/locking.py	(revision 0)
+++ tools/nixysa/nixysa/locking.py	(revision 0)
@@ -0,0 +1,68 @@
+#!/usr/bin/python2.4
+#
+# Copyright 2008 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This file implements flock-style file locking for use on Mac,
+Windows, or Linux.
+"""
+
+import sys
+
+if sys.platform == "win32":
+  import pywintypes
+  import win32con
+  import win32file
+
+  # Export the "standard" names for flock-style locking.
+  LOCK_SH = 0
+  LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY # 1
+  LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK  # 2
+  LOCK_UN = 4
+
+  overlapped = pywintypes.OVERLAPPED()
+  overlapped.hEvent = 0
+  overlapped.Offset = 0
+
+  def lockf(fd, operation):
+    file_handle = win32file._get_osfhandle(fd.fileno())
+    if operation == LOCK_UN:
+      try:
+        win32file.UnlockFileEx(file_handle, 0, -0x7fff0000, overlapped)
+      except pywintypes.error, e:
+        if e[0] == 158:
+          # Ignore error that happens when you unlock an already
+          # unlocked file.
+          pass
+        else:
+          raise
+    else:
+      try:
+        win32file.LockFileEx(file_handle, operation, 0, -0x7fff0000, overlapped)
+      except pywintypes.error, e:
+        if e[0] == 33:
+          raise Exception("Lock on fileno %d failed." % file.fileno())
+        else:
+          raise
+else:
+  import fcntl
+
+  # Export the "standard" names for flock-style locking.
+  LOCK_EX = fcntl.LOCK_EX
+  LOCK_NB = fcntl.LOCK_NB
+  LOCK_SH = fcntl.LOCK_SH
+  LOCK_UN = fcntl.LOCK_UN
+
+  def lockf(fd, operation):
+    fcntl.lockf(fd, operation)
Property changes on: tools/nixysa/nixysa/locking.py
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Added: svn:eol-style
   + LF