code: def send(self, content):
          
          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)
docs: 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