format  void STM_EraseCdbuf (StmHn stm, Sint32 spos, Sint32 snum)
 Input  stm: Stream handle
:  spos: Sector position (first sector is STM_CDBUF_TOP)
  snum: Number of sectors (STM_CDBUF_END for the end)
 Output  None
 Function value  None
 Function  Erases sector data in the CD buffer section assigned to the stream. 

  format  void STM_SetErrFunc (StmErrFunc func, void * obj)
 Input  func: Error function (STM_ERR_NULLFUNC to cancel)
  obj: Registered object
 Output  None
 Function value  None
 Function  Registers an error function for the stream system.
  registration function is called when an error occurs in the stream system.
 Remarks  (a) The registration function has the following format.
  void (* StmErrFunc) (void * obj, Sint32 ec)
:  (b) The registration object is passed as the first argument of the registration function, and the error code is passed as the second argument
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  (c) Register the error function in the file system. 

  format  void STM_GetErrStat (StmErrStat * stat)
 Input  None
 Output  stat: Error status
 Function value  None
 Function  Gets the error status of the stream system.
 Remarks  The error status is acquired by calling from the error function.