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SETINT Panic Interrupt Feature in IQA and IQE Page 1
There is a useful feature available to DECSYSTEM-20 IQL users which
allows for the use of a control character as a "panic interrupt" to
abort the analysis or execution of a query. This feature is disabled in
the distributed versions of IQA (the analysis module) and IQE (the
execution module), but it is very easy to re-enable this feature. The
steps involved are:
1. Edit the COBOL source file for IQA to REMOVE the * (comment
indicator) from COBOL source lines 016622, 016624, 017222,
017224, 017944, 017946, and 017948.
2. Edit the COBOL source file for IQE to REMOVE the * (comment
indicator) from COBOL source lines 020450, 020451, 021065,
021070, 023864, 023866, and 023868.
3. Recompile and relink these two modules as descirbed in
These two modules will now respond to the panic character CTRL-E
(^E) if it is typed while they are in execution. The module will
gracefully terminate execution and return to IQL (<QA>) level.
The control character CTRL-E was chosen
quite arbitrarily, simply because it is
also used as the panic interrupt character
in the DUMPER program. If some other
character is desired, simple replace the
literal numeric value "5" in the CALL
statement in both modules with the DECIMAL
value of the control character which is
desired to use as the interrupt character.
It is recommended that some characters NOT
be used, especially CTRL-C, CTRL-G,
CTRL-H, CTRL-I, CTRL-J, CTRL-L, CTRL-M,
CTRL-O, CTRL-Q, CTRL-S, CTRL-T, CTRL-U,
The subroutine SETINT is a Macro subroutine which uses JSYS's to
enable the pseudo-interrupt system to detect the panic interrupt
character. Thus, this feature is not available to TOPS-10 sites. It
these sites wish to write their own version of SETINT to detect panic
interrupt characters, they may do so by forcing their subroutine to be
loaded before the library file IQLIB is searched.