Writing System Exit Handlers

The following is a sample exit handler definition:
Sample system exit handler definition

LONG Rexx_IO_exit(
     LONG  ExitNumber,    /* code defining the exit function    */
     LONG  Subfunction,   /* code defining the exit subfunction */
     PEXIT ParmBlock);    /* function dependent control block   */

ExitNumber

The major function code defining the type of exit call.
Subfunction
The subfunction code defining the exit event for the call.
ParmBlock
A pointer to the exit parameter list.

The exit parameter list contains exit-specific information. See the exit descriptions following parameter list formats.

Note: Some exit subfunctions do not have parameters. ParmBlock is set to null for exit subfunctions without parameters.

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