Note: This function is supported in AIX® 5.1 and earlier only.
Ends a session with the Ethernet device handler.
The CIO_HALT operation ends a session with the Ethernet device handler. The caller indicates the network ID to halt. This CIO_HALT operation corresponds with the CIO_START operation successfully issued with the specified network ID.
The CIO_HALT operation functions with an Ethernet High-Performance LAN adapter that has been correctly configured for use on a qualified network. Consult the network adapter specifications for more information on configuring the network adapter and network qualifications.
Data for the specified network ID is no longer received. Data already received for the specified network ID, before the CIO_HALT operation, is still passed up to a user-mode caller by the entselect and entread entry points. The rx_fn routine specified at open time passes data to a kernel-mode caller.
When a CIO_HALT operation has ended the last open session on a channel, the caller should then issue the entclose operation.
For a CIO_HALT operation, the arg parameter points to a session_blk structure. This structure is defined in the /usr/include/sys/comio.h file and contains the following fields:
| Field | Description |
|---|---|
| status | There are two possible returned status values: |
| netid | Specifies the network ID. When IEEE 802.3 Ethernet is being used, the network ID is placed in the least significant byte of the netid field. |
A CIO_HALT operation can be called from the process environment only.
The return codes for the CIO_HALT operation are:
| Return Code | Description |
|---|---|
| EINVAL | Indicates the specified network ID is not in the table. |
| EBUSY | Indicates the open request was denied because the device was already open in Diagnostic mode or because the adapter was busy. |
| ENODEV | Indicates no such device exists. |
| ENXIO | Indicates an attempt to use an unconfigured device. |