Small utility function to get a running program's own executable path. This should work even if it's called using a symbolic link.

getself.cpp

std::string getSelf()
{
	char buf[1024] = { 0 };
#ifdef WIN32
	DWORD ret = GetModuleFileNameA(NULL, buf, sizeof(buf));
	if (ret && ret != sizeof(buf)) {
		std::string res(buf);
		for (auto &c : res)
			if (c == '\\')
				c = '/';
		return res;
	}
#else
	ssize_t ret = readlink("/proc/self/exe", buf, sizeof(buf));
	if (ret && ret != sizeof(buf))
		return buf;
#endif
	throw std::exception("Couldn't determine executable path.");
}