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Files Reference
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:
- A non-privileged user tried to open the device in
Diagnostic mode.
- An illegal call from a kernel-mode user.
- An illegal call from a user-mode user.
|
| ENETDOWN
| Indicates one of the following:
- The network is down. The device is unable to
process the requested operation.
- An unrecoverable hardware error.
|
| 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 FDDI device driver is a
separately orderable feature code with the Base Operating System.
The close subroutine, ioctl subroutine, open subroutine, poll subroutine, read subroutine, select subroutine, and write subroutine.
Special
Files Overview in AIX 5L Version 5.1 Files
Reference.
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