Allows kernel to close the generic data link control (GDLC) device manager using a file pointer.
| fp | Specifies the file pointer of the GDLC being closed. |
| ext | Specifies the extension parameter. This parameter is ignored by GDLC. |
The fp_close kernel service disables a GDLC channel. If this is the last channel to close on a port, the GDLC device manager resets to an idle state on that port and the communications device handler is closed.
| 0 | Indicates a successful completion. |
| ENXIO | Indicates an invalid file pointer. This value is defined in the /usr/include/sys/errno.h file. |
Each GDLC supports the fp_close kernel service by way of its dlcclose entry point. The fp_close kernel service may be called from the process environment only.
The fp_close kernel service.
The fp_open kernel service for data link control (DLC) devices.
Generic Data Link Control (GDLC) Environment Overview in AIX Version 4.3 Kernel Extensions and Device Support Programming Concepts.