[Caml-list] [Question] Loading .ml in memory to interact with them.

[paul.lachat@edu.univ-fcomte.fr]

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Hello, 

I need to find a way to put Ocaml program in memory so I could interact with the program 
(call function, get result, find information about the variables, ...) without always reading the file. 

That what append when we use the directive #use "file.ml";; in the interactive shell (the toplevel, when you type the command ocaml in a shell). 

The instruction need to come from a Matlab function. So, I was thinking to create a process who run the ocaml command, 
redirect his standard input in a named pipe, redirect his standard output in another named pipe, so I could send instructions and received responses. 

But when I send the first instruction (ex : #use "file.ml";;\n), the ocaml process send back the response and stop. 

____ 

file.ml : 
let x = 10;; 

____ 

"#use "file.ml";;\n" 
Matlab -- /tmp/pipe_in --> ocaml 

"val x : int = 10" 
Matlab <-- /tmp/pipe_out -- ocaml 
then ocaml stop... 

___ 


So I would like to know if you think it's a good solution and if it is, do someone know how could I make it work ? 

_ 

I've tried another solution. I use Unix.fork() and launch, in the son process, the ocaml command then 
I send instructions from the father process to the son process with anonym pipe (Unix.pipe()). 

But here I have trouble with blocking read, I send an instruction, read the answer but even if I've read all char of the answer, it's wait to read 
more but there is no more to read... 

I have tried to use Unix.set_nonblock() and catch EAGAIN, but then I don't get anything at all in the buffer given to Unix.read(). 

If someone could help, I would be grateful ! 
Lachat Paul 


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