Removes the module just below the stream head.
The I_POP operation removes the module just below the stream head of the stream pointed to by the fildes parameter. The value of the arg parameter should be 0 in an I_POP request.
This operation is part of STREAMS Kernel Extensions.
If unsuccessful, the errno global variable is set to one of the following values:
| Value | Description |
|---|---|
| EINVAL | No module is present in the stream. |
| ENXIO | Hangup received on the fildes parameter. |