Gets the band of the first message on the stream-head read queue.
The I_GETBAND operation returns the priority band of the first message on the stream-head read queue in the integer referenced by the arg parameter.
This operation is part of STREAMS Kernel Extensions.
If unsuccessful, the errno global variable is set to the following value:
| Value | Description |
|---|---|
| ENODATA | No message is on the stream-head read queue. |