Detecting vmware POC, part of a series im doing

/// GNU version
// ------------------------------------------------------------------------------
// 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
// ------------------------------------------------------------------------------

#include <unistd.h>
#include <signal.h>
main(a);
__sighandler_t handler(int sig)
{
    switch(sig)
    {
        case SIGSEGV:
            main(0xc0de);
        break;
    }
}

unsigned vmware(void)
{
asm(
    ".intel_syntax noprefix\n"
    "mov eax, 0x564d5868\n"
    "mov cl, 0xa\n"
    "mov dx, 0x5658\n"
    "in eax, dx\n"
    "cmp ebx, 0\n"
    "jne matrix\n"
    "xor eax, eax\n"
    "ret\n"
    "matrix:\n"
    "mov eax, 1\n");
}



main(a)
{
    if(a==0xc0de) goto stage2;
    signal(SIGSEGV, &handler);

    if(vmware()) goto matrix;

stage2:
    puts("Isn't real life boring?");
    exit(0);

matrix:
    puts("The Matrix haz you Neo...");
    exit(1);
}



/// Windblowz version for completeness sake
// ------------------------------------------------------------------------------
// 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
// ------------------------------------------------------------------------------

#include <iostream>
#include <windows.h>

unsigned vmware(void)
{
__asm{
    mov eax, 0x564d5868
    mov cl, 0xa
    mov dx, 0x5658
    in eax, dx
    cmp ebx, 0
    jne matrix
    xor eax, eax
    ret
    matrix:
    mov eax, 1};
}

int seh_filter(unsigned code, struct _EXCEPTION_POINTERS* ep)
{
    return EXCEPTION_EXECUTE_HANDLER;
}

int _tmain(int a, _TCHAR* argv[])
{
    __try
    {
        if(vmware()) goto matrix;
    }
    __except(seh_filter(GetExceptionCode(), GetExceptionInformation()))
    {
            goto stage2;
    }

stage2:
    std::cout << "Isn't real life boring?"<<std::endl;
    exit(0);

matrix:
    std::cout << "The Matrix haz you Neo..."<<std::endl;
    exit(1);
}