[erlang-questions] rpc call from erlang node to cnode

Mon Aug 1 17:22:01 CEST 2016

Hi Vlad,

      Thank you for the valuable comment. Actually i have implemented 
cnode the way you have mentioned ie. through message passing. The cnode 
is used to interface erlang with my C application, which is a library 
and have some handy number of functions implemented in it with unique 
functionalities. So if i want to call any of those functions, i need to 
send specific message, these messages should be interpreted at cnode and 
based on this i should call the specific functionality. The message 
interpretation was tedious, thats why this doubt popped up in my mind.

Best regard

On Sunday 31 July 2016 01:46 PM, Vlad Dumitrescu wrote:
> Hi Arun,
> Well, it is possible to do RPC calls in all directions, but what is 
> missing is a framework on the cnode that will handle it. An RPC call 
> is simply a mesage from a node to another. Cnodes are not beam VMs and 
> you would have to implement code that receives the message, interpret 
> it to find out what to call (because cnodes know nothing about Erlang 
> code and libraries), execute the call and return the result as another 
> message.
> My guess is that cnodes were thought in the beginning to serve as 
> "inputs" in the system, interfacing with the world. This has partially 
> been superseded by NIFs.
> Why do you need to make RPC calls to a cnode?
> best regards,
> Vlad
> On Sat, Jul 30, 2016 at 4:48 PM, ARUN P <arunp@REDACTED 
> <mailto:arunp@REDACTED>> wrote:
>     Hi ,
>         can anyone please suggest me is there any possible way to do
>     rpc call from erlang node to cnode. I understand that there is no
>     direct mechanism available to make rpc to cnode, but am curious
>     because of the fact that, am able to make rpc call from cnode to
>     erlang node, then why vice-vers is not possible. Somebody kindly
>     assist me.
>     Thanks in advance.
>     Arun
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