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Chapter 4 73
Administration
Querying the Gateway
All the sessions for a particular connection are listed together and only the
first session has the Server ID, Client IP Addr, and Client ID
specified. For a given client, one session at most will have an operation
pending or in progress at a given time.
The Client IP Addr and Client ID are both needed to uniquely
identify a client connection. In the previous example, clients 1 and 3 are
separate processes on the same machine (that is, they have the same
Client IP Addr).
If an Operation is specified for a given session and the session does not
have a Lock, the operation for the session may be waiting for another client
to complete an I/O operation or to unlock a device or the interface. In the
previous example, client 2 is waiting to get a lock on device 21 after client 1
completes the WRITE operation and unlocks device 21. Also, client 3 is
waiting for client 2 to unlock device 9,2 (primary,secondary) before it can
perform the READ operation.
If an Operation is specified for a given session and the session does have
a Lock, the operation is likely to be in progress and not waiting on another
client to complete an operation. For more information, consult the
documentation for your I/O application software on how interface locks and
device locks work in your software.
The following is a list of Operation field values and the SICL functions that
correspond to them. If you want to terminate the client connections, see
“Terminating Client Connections”.
Operation SICL Function
ATNCTL igpibantctl
BUSADDR igpibbusaddr
BUSSTAT igpibbusstatus
CLEAR iclear
CLOSE iclose
GETDEV igetdevaddr
GETINTF igetintftype
GETLU igetlu
GETSESS igetsesstype