void interruptHandler();
int setInterrupt(int pin, int edge, char *callback);

char *perl_callback;
PerlInterpreter *mine;

void interruptHandler(){
    PERL_SET_CONTEXT(mine);

    dSP;
    PUSHMARK(SP);
    PUTBACK;

    call_pv(perl_callback, G_DISCARD|G_NOARGS);

    FREETMPS;
    LEAVE;
}

int setInterrupt(int pin, int edge, char *callback){
    perl_callback = callback;
    int interrupt = wiringPiISR(pin, edge, &interruptHandler);
    return interrupt;
}

# XS

int
setInterrupt(pin, edge, callback)
    int pin
    int edge
    char *callback

void
interruptHandler()