Write the content received from the SSH client to the standard
        input of the forked command.

        :param str content: string to be sent to the forked command

def send(self, content):
        """
        Write the content received from the SSH client to the standard
        input of the forked command.

        :param str content: string to be sent to the forked command
        """
        try:
            self.process.stdin.write(content)
        except IOError as e:
            # There was a problem with the child process. It probably
            # died and we can't proceed. The best option here is to
            # raise an exception informing the user that the informed
            # ProxyCommand is not working.
            raise ProxyCommandFailure(" ".join(self.cmd), e.strerror)
        return len(content)