def send_signal(self, sig):
        """Send a signal to process (see signal module constants).
        On Windows only SIGTERM is valid and is treated as an alias
        for kill().
        """
        # safety measure in case the current process has been killed in
        # meantime and the kernel reused its PID
        if not self.is_running():
            name = self._platform_impl._process_name
            raise NoSuchProcess(self.pid, name)
        if os.name == 'posix':
            try:
                os.kill(self.pid, sig)
            except OSError:
                err = sys.exc_info()[1]
                name = self._platform_impl._process_name
                if err.errno == errno.ESRCH:
                    raise NoSuchProcess(self.pid, name)
                if err.errno == errno.EPERM:
                    raise AccessDenied(self.pid, name)
                raise
        else:
            if sig == signal.SIGTERM:
                self._platform_impl.kill_process()
            else:
                raise ValueError("only SIGTERM is supported on Windows")
Send a signal to process (see signal module constants).
        On Windows only SIGTERM is valid and is treated as an alias
        for kill().