Error Trapping

Using the “ON” statement, you can set

multiple levels of error trapping:

$ ON WARNING THEN statement

$ ON ERROR THEN statement

$ ON SEVERE_ERROR THEN statement

$ ON CONTROL_Y THEN statement

Turn error trapping off or on:

$ SET NOON

$ SET ON

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Through the use of the “ON” statement and the “SET ON” and “SET NOON” statements, you can control how DCL behaves when various type of errors or events occur.

A WARNING event occurs when the severity is zero(0) (($STATUS .AND. 7) .EQ. 0).

An ERROR event occurs when the severity is two(2) (($STATUS .AND. 7) .EQ. 2).

A SEVERE ERROR event occurs when the severity is four(4) (($STATUS .AND. 7) .EQ. 4).