Detecting most hypervisors using time :D

// ------------------------------------------------------------------------------
// THE BEER-WARE LICENSE (Revision 43):
// <aaronryool@gmail.com> wrote this file. As long as you retain this notice you
// can do whatever you want with this stuff. If we meet some day, and you think
// this stuff is worth it, you can buy me a beer in return
// ------------------------------------------------------------------------------
// this is an original POC, if you steal it, I will know :P
#include <unistd.h>
#include <stdio.h>

inline unsigned long rdtsc(void)
{
    unsigned long x;
    asm volatile ("rdtsc" : "=A" (x));
    return x;
}

unsigned long check_time(void* fun)
{
    static unsigned long StartingTime, EndingTime;

    StartingTime = rdtsc();
    ((void(*)(void))fun)();
    EndingTime = rdtsc();
    return (EndingTime - StartingTime);
}

void test(void)
{
    int i=0;
    for(;i!=100;i++)
    asm volatile (
        "add eax, ecx\n"
        "imul eax, ebx\n"
        "sub eax, ebx\n"
        "neg eax\n"
        "sbb eax, ecx\n"
    );
}

int pass(void)
{
    int i=0;
    unsigned long x;
    for(;i!=10000;i++)
    {
        x=check_time(test);
        if(x>15000) return 1;
    }
    return 0;
}

int main()
{
    int i=0,x=0;
    for(;i!=1000;i++)
        x+=pass();

    if(x>200)
        puts("matrix");
    else
        puts("realness");
    return 0;
}