Guardian Programmer's Guide

Writing a Command-Interpreter Monitor ($CMON)
Guardian Programmer’s Guide — 421922-014
23 - 24
Controlling Adding and Deleting Users
The following code fragment allows the priority to be reduced but not increased:
CALL READUPDATEX(RECV^NUM,SBUFFER,RCOUNT,BYTES^READ);
IF BUFFER[0] = -56 THEN
BEGIN
ALTPRI^MSG ':=' SBUFFER FOR BYTES^READ;
ERROR := PROCESS_GETINFO_(ALTPRI^MSG.PROCESS^HANDLE,
!file^name:maxlen!,
!file^name^len!,
PRIORITY);
IF ERROR <> 0 THEN
BEGIN
ALTPRI^REPLY.REPLYCODE = 1;
END
ELSE
BEGIN
IF PRIORITY > ALTPRI^MSG.PRIORITY
THEN ALTPRI^REPLY.REPLYCODE = 0
ELSE ALTPRI^REPLY.REPLYCODE = 1;
END;
REPLY^LEN := 2;
CALL REPLYX(ALTPRI^REPLY,REPLY^LEN);
END;
Controlling Adding and Deleting Users
Attempts to add or delete users can be controlled by the $CMON process. The
ADDUSER or DELUSER process asks $CMON for verification when a user issues an
ADDUSER or DELUSER command.
Controlling Adding a User
When a user attempts to add a user to the system using the ADDUSER command, the
ADDUSER process sends an Adduser^msg message to the $CMON process to verify
the request. $CMON can either accept the request as it is or reject it.
Note that for a user to add a new user to the system, one of the following must be true:
• The user issuing the command is the group manager (n, 255) of the new user.
• The user issuing the command is the super ID (255, 255).
If neither of the above is true, then the user cannot add a new user, regardless of
$CMON.