Provides access to the FDDI device driver by way of the FDDI device handler.
The fddin special file provides access to the FDDI device handler that provides access to a FDDI local area network.
When accessing the FDDI device driver, the following information should be taken into account.
The device driver can be loaded and unloaded. The device driver supports the configuration calls to initialize and terminate itself.
Subroutine calls other than those made with the open and close subroutines are discussed based on the mode in which the device driver is operating.
The FDDI device driver provides specific support for the open, close, read, write, ioctl, select, and poll subroutines.
The device driver supports the /dev/fddin special file as a character-multiplex special file. The special file must be opened for both reading and writing. There are no particular considerations for closing the special file. The special file name used in an open call differs depending upon how the device is to be opened. Types of special file names are:
| /dev/fddin | Starts the device driver for the selected port. |
| /dev/fddin/D | Starts the device driver for the selected port in Diagnostic mode. |
| /dev/fddin/C | Starts the device driver for the selected port in Diagnostic Configuration mode. |
The following error conditions may be encountered when accessing the FDDI device driver through the /dev/fddin special file. The error codes can be found in the /usr/include/sys/errno.h file.
| ENODEV | Indicates that an invalid minor number was specified. |
| EINVAL | Indicates that an invalid parameter was specified. |
| ENOMEM | Indicates that the device driver was unable to allocate the required memory. |
| EINTR | Indicates that a system call was interrupted. |
| EPERM | Indicates that the Diagnostic mode open request was denied because the device was already open. |
| EACCES | Indicates one of the following:
|
| ENETDOWN | Indicates one of the following:
|
| ENETUNREACH | Indicates that the device is in Network Recovery mode and is unable to process the requested operation. |
| ENOCONNECT | Indicates that the device has not been started. |
| EAGAIN | Indicates that the transmit queue is full. |
| EFAULT | Indicates that an invalid address was supplied. |
| EIO | Indicates an error. See the status field for detailed information. |
| EMSGSIZE | Indicates that the data was too large to fit into the receive buffer and that no ext parameter was supplied to provide an alternate means of reporting this error with a status of CIO_BUF_OVFLW. |
The close subroutine, ioctl subroutine, open subroutine, poll subroutine, read subroutine, select subroutine, and write subroutine.
Special Files Overview in AIX 5L Version 5.2 Files Reference.