[erlang-questions] Term to binary in a NIF

Matthew Evans <>
Mon Feb 13 17:56:55 CET 2012


Hi
I've written a NIF that takes data from an external device driver, converts it to a term (a tuple) and uses enif_send (from a thread created by the nif) to a specific Erlang process.
Unfortunately on some deployments we have been forced to disable SMP in the Linux kernel and BEAM due to a third-party driver issue. In these cases what I have done is used enif_system_info in the NIF, and if SMP is disabled I will send the message via a unix domain socket (I have a driver for that) instead of enif_send.
On the Erlang side the UDS is opened, and I use erlang:open_port to pass the unix domain socket to the event loop. What is nice here is that I can use the same Erlang and C code for both SMP enabled and disabled systems. So the Erlang process would get an Erlang message like:
{driver_result,Integer,Integer} - If SMP is enabled
Or: 
{#Port<0.647>,{data,SomeBinary}} - If SMP is disabled
What I would like to do is see if I can send the message as an Erlang term to the unix domain socket using something like term_to_binary in the NIF (I would prefer that instead of sending raw binary to Erlang with enif_send).
Is that possible?
Thanks
Matt 		 	   		  
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