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Not to self: ERROR_ALREADY_EXIST (183) can also mean your named Mutex already exists

Posted by jpluimers on 2020/09/16

A while ago, I had an error like this when debugging plugins:

Project bds.exe raised exception class EOSError with message ‘System Error.  Code: 183.
Cannot create a file when that file already exists’.

It got was raised when [WayBackGetLastError returned ERROR_ALREADY_EXIST which according to [WayBackSystem Error Codes (0-499) (Windows) has this description:


183 (0xB7)
Cannot create a file when that file already exists.


The last line is the same description that [WayBackFormatMessage returns. And it put me on the wrong foot as it wasn’t a file, but a mutex that was created: indeed [WayBackCreateMutex documents it:

If the mutex is a named mutex and the object existed before this function call, the return value is a handle to the existing object, GetLastError returns ERROR_ALREADY_EXISTS, bInitialOwner is ignored, and the calling thread is not granted ownership. However, if the caller has limited access rights, the function will fail with ERROR_ACCESS_DENIED and the caller should use the OpenMutex function.

In the mean time, the plugin doesn’t raise that as an exception any more.



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