If you want to communicate between two running processes, that will be much harder than just writing/reading the values to a tempfile.

However, there is Convert::Binary::C, which was made for just that situation, debugging a remote process and dumping C structures from within Perl. Maybe that helps you.

That really doesn't get us much further ahead. Do you want write code to call Perl from C (possible), or write code to call C from Perl (also possible), or call an existing C library function from Perl (possible too), or execute an existing Perl script from a C application passing a value through (possible) or execute an existing C application from a Perl script returning a value to the script (also possible), or something else?

Maybe you should let us in on the secret of what you actually want to do?

i am writing a code to call C from Perl. As I said I have one variable in a C code that I want to export. This variable needs to be used by a perl function.

So in fact it seems you have some C code that you need to access from Perl. The key "word" you need is "XS" and the documentation is in perlxs. You will probably find that documentation heavy going. If you describe what you are doing better you may garner more help. Calling some C code from Perl and returning a result is a very common task.

True laziness is hard work