Module variable going out of scope causes open session to be broken and cause SegFault

[Magentron]

This is related to #31.

When doing something like this (pseudo code):

    // function loadModule($path): Module
    return new Module($path);
    
    // function openSession($path, $slot, $pin): Session
    $module = loadModule($path)
    $session = $module->openSession($slot, Pkcs11\CKF_RW_SESSION);
    $session->login(Pkcs11\CKU_USER, $pin);
    $session->getInfo(); // debug
    return $session;
            
    // function getObjects(Session $session)
    return $session->findObjects([
        Pkcs11\CKA_LABEL => 'My name',
    ]);

Before the findObjects() call, the C function pkcs11_shutdown() is called for the module and upon entering findObjects() the session functionList is NULL.

If I put the calls sequentially without functions it does work, so it seems that upon leaving openSession() somehow the PKCS11 shutdown function is called for the module because it going out of scope. This probably should not happen since the session is still open.

How can we solve this best?

[gamringer]

I remember having tested this specifically to avoid what you're describing. Obviously, whatever I did was wrong.

I'll look into it. Thanks.

[Magentron]

My first hunch would be that reference counting would be necessary.

[gamringer]

Yeah, that's what I'm thinking as well.

[Magentron]

Let me know if I can help

[vjardin]

@gamringer

Few months ago, I wanted to introduce a constructor and destructor in order to benefit from PHP's internal ref counters. I feel it could help to solve such issue.