[erlang-questions] port driver naming

[Michael Truog]

On 6/25/19 2:17 PM, Serge Aleynikov wrote:
> When writing a port driver the "driver_name" field in the ErlDrvEntry 
> structure is defined to match the name of the driver file.
>
> Is it possible to name the driver file differently from what's 
> specified in the ErlDrvEntry?
>
> I have two architectures x86 and x64, and would like to distribute a 
> prebuilt library with my application in the 32 and 64 bit flavors, and 
> have the application choose the proper driver filename depending on 
> the target architecture of the host machine.  For this reason I am 
> wondering if it's possible to name a driver file as "myapp-x86" or 
> "myapp-x64" with a driver name field containing "myapp".  Is that doable?
>
> Regards,
>
> Serge
Hi Serge,

With the current Erlang/OTP source code, you can get this to work by 
having driver_name be different for each file by using the preprocessor 
to create the unique filename.  You would effectively be using the 
string "myapp-" #arch, though it would require a few macros to expand 
properly (in the C/C++).

Best Regards,
Michael
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