TN3270 Server Manual

ITI Communication Protocol
TN3270 Server Manual—424097-001
6-5
CONTROL Operations
CONTROL Operations
The CONTROL operation performs device-dependent I/O operations. CONTROL 11
and 12 operations are used for session management. CONTROL 11 waits for a session
to be established. CONTROL 12 disconnects a session.
filenumber
INT:value
is the number of an open file, identifying the file to which the CONTROL procedure
performs an I/O operation.
operation
INT:value
is either 11 (wait for session establishment) or 12 (disconnect the session).
parameter
INT:value
is the value of an operation being performed. The Guardian TN3270 Server ignores
the argument when nothing is defined.
tag
INT(32):value
is a value that you specify which uniquely defines the operation associated with this
CONTROL operation. tag applies to nowait I/O operations only.
CALL CONTROL (filenumber, operation, parameter [, tag ])