HP 3000 Manuals HP 3000 Manuals
Error Handling SDVPD recognizes three different categories of errors: 1) syntax errors, 2) operational errors, and 3) fatal errors. SDVPD responds to these errors in different ways, depending upon the category. Syntax errors are errors caused either by mistyping a command or by specifying illegal command construction. When these errors are detected, a caret pointer is displayed pointing to the location of the error, along with an error message. Operational errors are caused by commands that request invalid operations. For example, requesting LOAD when no dictionary is open is an operational error. An error message is displayed in response to these errors. Fatal errors are those errors which are usually disc-related errors over which the program has very little or no control. When such an error is detected, the program is terminated. Failure to open $STDINX is such an error. When a fatal error is detected by the system, the Job Control Word is assigned a value greater than or equal to FATAL.