This message is the first in a group of messages issued by VTAM® exit services when an error has been detected while processing a request from a user-written exit. A complete description of the message group follows.

IST1455I ERROR DETECTED BY EXIT SERVICES FOR exitname IN modulename
IST1456I FUNCTION function - REASON: reason
IST314I  END

IST1455I

• exitname is the CSECT name of the exit.
• modulename is the name of the load module that contains exitname.

IST1456I

• function is the function being performed by VTAM exit services and can be one of the following:

  *UNKNOWN

  The function requested could not be determined.

  MESSAGE

  The exit exitname requested the message function.

• reason is the reason for the error and can be one of the following:

  EXSPL POINTER IS ZERO

  The pointer to the EXSPL (passed by the exit in register 1) is zero.

  INPUT PARMLIST POINTER IS ZERO

  The pointer to the input parameter list in the EXSPL is zero.

  MESSAGE LENGTH IS NOT VALID

  The message text length specified in the EXMPL is not valid. Message text length must be greater than 0 and less than or equal to 4096 (decimal).

  MESSAGE TEXT POINTER IS ZERO

  The pointer to the message text in the EXMPL is zero.

  REQUESTED FUNCTION IS NOT VALID

  The function code specified in the EXSPL is not defined to (nor supported by) the current level of VTAM exit services.

  VTAM MESSAGE MACRO FAILED

  The macro used by VTAM to send a message to the system console returned a nonzero return code to exit services.