[bdbxml] Environment initialization on shmget systems.

Hi,

A while back I asked about using the shmget interface with bsddb. 
I've finally come to believe that the set_shm_key code is working 
correctly. The problem I'm having is the same DBEnv.open() flags 
that work on Windows don't work on OS/X.

On Windows I'm initializing an environment by first creating an 
environment in a common directory and including the 
DB_RECOVER_FATAL | DB_CREATE flag. This removes an existing 
environment if it already exists. Then I initialize another 
environment in the same directory with the following flags:

DB_INIT_MPOOL | DB_SYSTEM_MEM | DB_CREATE | DB_THREAD

On Windows this works fine. However on OS/X, the code bombs 
either with a DBNoSuchFileError if the environment file 
(__db.001) doesn't exist. Of course it doesn't exist; bsddb is 
supposed to be creating it.

I need a method to properly initialize a shared memory 
environment that works on both shmget and non-shmget 
systems. I'm calling set_shm_key under Windows since it's just 
stubbed in that environment, and that seems to work fine. But 
bsddb doesn't want to create the shared environment file on OS/X, 
even though I have file create privilidges in the directory, and 
specified the DB_CREATE flag.

Any help appreciated,

Brian




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