Initialize struct flock for AIX with O_LARGEFILE used by Python.

pylib/gyp/flock_tool.py

 #!/usr/bin/env python
 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """These functions are executed via gyp-flock-tool when using the Makefile
 generator.  Used on systems that don't have a built-in flock."""
 
 import fcntl
 import os
@@ skipping 22 matching lines @@
     return name_string.title().replace('-', '')
 
   def ExecFlock(self, lockfile, *cmd_list):
     """Emulates the most basic behavior of Linux's flock(1)."""
     # Rely on exception handling to report errors.
     # Note that the stock python on SunOS has a bug
     # where fcntl.flock(fd, LOCK_EX) always fails
     # with EBADF, that's why we use this F_SETLK
     # hack instead.
     fd = os.open(lockfile, os.O_WRONLY|os.O_NOCTTY|os.O_CREAT, 0666)
-    op = struct.pack('hhllhhl', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
+    if sys.platform.startswith('aix'):

[Nico, 2014/11/21 17:32:14]

Please add a comment saying

  # Python on AIX is compiled with LARGEFILE support, which changes the struct
size.

above the new struct.pack line.

+      op = struct.pack('hhIllqq', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
+    else:
+      op = struct.pack('hhllhhl', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
     fcntl.fcntl(fd, fcntl.F_SETLK, op)
     return subprocess.call(cmd_list)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))