Guardian Procedure Calls Reference Manual

CHANGELIST Procedure
Summary
Syntax for C Programmers
Syntax for TAL Programmers
Parameters
Condition Code Settings
Example
Related Programming Manuals
Summary
The CHANGELIST procedure is used only when the application program acts as a supervisor or
tributary station in a centralized multipoint configuration.
Within a supervisor station, CHANGELIST performs one of these operations:
• Specifies continuous or noncontinuous polling
• Enables or disables polling of a particular station
• Resumes polling of partially disabled (that is, nonresponding) stations
• Performs the activation or deactivation of a tributary station by altering the setting of the poll
state bit for a particular entry
NOTE: If polling is in progress when you make the call to CHANGELIST, the specified changes
do not take effect until polling completes either on its own or as the result of a call to HALTPOLL.
Syntax for C Programmers
#include <cextdecs(CHANGELIST)>
_cc_status CHANGELIST ( short filenum
,short function
,short parameter );
• The function value returned by CHANGELIST, which indicates the condition code, can be
interpreted by _status_lt(), _status_eq(), or _status_gt() (defined in the file
tal.h).
Syntax for TAL Programmers
CALL CHANGELIST ( filenum ! i
,function ! i
,parameter ); ! i
Parameters
filenum
input
INT:value
is the one-word integer variable returned by the call to FILE_OPEN_ or OPEN that opened the
line.
118 Guardian Procedure Calls (C)