topic Re: Control C option in Operating System - OpenVMS

Control C option

Art Dantonio — Wed, 21 Apr 2004 11:42:30 GMT

How can this be disable for a group of users to prevent them from breaking out of a preset menu?

Re: Control C option

Martin P.J. Zinser — Wed, 21 Apr 2004 11:56:57 GMT

Hello,

what you want to achieve is handeled in VMS by setting the account to captive in the SYSUAF.

Check

mcr authorize
help modif/flag

for further details.

Greetings, Martin

Re: Control C option

Antoniov. — Wed, 21 Apr 2004 12:43:44 GMT

To update a full group you can refer using asterisk.
For example, to change all user of group [100] you can write
UAF>MODIFY [100,*]/FLAG=DISCTLY

@Antoniov

Re: Control C option

Jan van den Ende — Wed, 21 Apr 2004 13:36:44 GMT

Art,

During DCL execution CONTROL-C and CONTROL-C are equsl

If you DON'T want to block the users permanently, but ONLY when in that menu, you can
$ SET NOCONTROL=Y,
and later on free them again with
$SET CONTROL=Y

This even gives you control over what action you might wish to be taken should they still try it:

$ ON CONTROL-Y THEN

Success!!

Jan

Re: Control C option

Jan van den Ende — Thu, 22 Apr 2004 01:55:13 GMT

Sorry, typo

should of course be: CONTROL-C & CONTROL-Y treated equal.

Jan

Re: Control C option

Wim Van den Wyngaert — Thu, 22 Apr 2004 04:07:25 GMT

Note that putting a user in captive mode will have other influences too :
check help or security doc before using it.

Re: Control C option

Antoniov. — Thu, 22 Apr 2004 04:45:32 GMT

Hi,
as posted by Jan you can change dinamically the control.
I have some user can operate in privilegiate mode (as system) under a menu control. So I disabled CTRLY in their account (as previous explained) and inside a DCL procedure I enable Ctrl+C (and Ctrl+Y) to stop running.
You can inquire state of control, see below:
$ CTRL=F$ENVIRONMENT("CONTROL") !Store state
$ ON CONTROL_Y THEN GOTO INTERRUPTED
$ SET CONTROL !Enable all controls
[...] blah blah blah [..]
$ IF F$LOCATE("Y",CTRL).LT.F$LENGHT(CTRL) THEN SET CONTROL

@Antoniov