[erlang-questions] How to exchange sensitive data with ports?

[Elena Garrulo]

2009/8/8 Richard Andrews <bflatmaj7th@REDACTED>:
> You can use a linked-in driver. Write the driver in C and load it as a
> .so or .dll into the erlang node that needs to access the smart card
> libs. The data doesn't leave the process space - but it must get there
> somehow.

What if C calls are time consuming? Does whole Erlang VM stop until
the C procedure returns?

>
> Of course root can watch usually any data in any process (SELinux
> might prevent that).
>

And user? Can a user process watch another (same) user process?

Thanks