#include <windows.h>
#include <winternl.h>
#include <stdio.h>
#include <assert.h>

#define log(msg, ...) printf(msg "\n", ##__VA_ARGS__)

extern "C" {
	extern PTEB getTEB(void);
	extern DWORD CustomError(void);
}

int main() {
	log("TEB: 0x%p", getTEB());

	{
		HANDLE process = OpenProcess(PROCESS_ALL_ACCESS, FALSE, 1337);
		assert(process == NULL);
		log("Real GetLastError: %ld", GetLastError());
		log("Custom GetLastError: %ld", CustomError());
	}

	return 0;
}