fcntl substitute on Windows

Question

I received a Python project  which happens to be a Django project  if that matters   that uses the fcntl module from the standard library  which seems to be available only on Linux  When I try to run it on my Windows machine  it stops with an ImportError  because this module does not exist here   Is there any way for me to make a small change in the program to make it work on Windows

User · Answer

Although this does not help you right away, there is an alternative that can work with both Unix (fcntl) and Windows (win32 api calls), called: portalocker

It describes itself as a cross-platform (posix/nt) API for flock-style file locking for Python. It basically maps fcntl to win32 api calls.

The original code at http://code.activestate.com/recipes/65203/ can now be installed as a separate package - https://pypi.python.org/pypi/portalocker

User · Answer

The fcntl module is just used for locking the pinning file  so assuming you don t try multiple access  this can be an acceptable workaround   Place this module in your sys path  and it should just work as the official fcntl module   Try using this module for development testing purposes only in windows   def fcntl fd  op  arg 0       return 0  def ioctl fd  op  arg 0  mutable flag True       if mutable flag          return 0     else          return     def flock fd  op       return  def lockf fd  operation  length 0  start 0  whence 0       return

User · Answer

The substitute of fcntl on windows are win32api calls  The usage is completely different  It is not some switch you can just flip   In other words  porting a fcntl-heavy-user module to windows is not trivial  It requires you to analyze what exactly each fcntl call does and then find the equivalent win32api code  if any    There s also the possibility that some code using fcntl has no windows equivalent  which would require you to change the module api and maybe the structure paradigm of the program using the module you re porting   If you provide more details about the fcntl calls people can find windows equivalents

[python] fcntl substitute on Windows

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