Passing the reason for invocation

When the exit routine is invoked, the first token passed to it indicates the reason it was invoked. This could be:

INIT

IDF is preparing to present its first screen display.

BREAK

A breakpoint has been reached.

LIMITS

A target program has branched outside of its memory limits.

WARN

IDF is at risk because of code the target program has, or is about to, execute.

When the event code is "WARN", the last Command window message display line in the Command window is set to one of these messages:

See Message numbers and severity levels for the text of each message, and the suggested user response.

The contents of the last message should be extracted using the EXTRACT LASTMSG command, and an appropriate action taken by the exit routine.

PROGCHK

A program check has occurred.

ABEND

The target program experienced a CMS, z/OS, or z/VSE ABEND.

PFKEY

The RUNEXIT command was issued.

DONE

The target program has completed and returned control to IDF

STEP

A single-step operation was just completed.

QUIT

The operator has issued the QUIT or RCQUIT command.

SVC

CMS Only. SVC tracing is in effect and an SVC instruction has been reached.

ADSTOP

CMS Only. A monitored storage location has been modified.

REGSTOP

CMS Only. A monitored register has been modified.