• int
  exit status
• bool
  if true: immediate unloading dll, if false: just set flag, unload is done when function has returned
• bool
  if true: exit upon 'quit', if false: exit due to ngspice.dll error
• int
  identification number of calling ngspice shared lib (default is 0, see Chapt. 19.6)
• void*
  return pointer received from caller

asking for a reaction after controlled exit.