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Technical Reference: Kernel and Subsystems, Volume 2
CIO_GET_FASTWRT (Get Fast Write) tokioctl Token-Ring Device Handler
Operation
Purpose
Note: This function is supported in AIX 5.1 and earlier only.
Provides the attributes of the tokfastwrt entry point.
Description
The CIO_GET_FASTWRT tokioctl
operation is used to get the parameters required to issue the tokfastwrt entry point, which is the kernel-mode fast
write command for the token-ring device handler. For the CIO_GET_FASTWRT operation, the arg parameter
points to the cio_get_fastwrt structure. This structure
is defined in the /usr/include/sys/comio.h file and
contains the following fields:
Field |
Description |
status |
Returns one of the following status values:
|
fastwrt_fn |
Specifies the address of the tokfastwrt entry
point. |
chan |
Specifies the channel ID. |
devno |
Specifies the major and minor device numbers. |
The CIO_GET_FASTWRT tokioctl operation functions with a Token-Ring High Performance Network
Adapter that has been correctly configured for use on a qualified network.
Consult the adapter specifications for more information on configuring the
adapter and network qualifications.
Execution Environment
The CIO_GET_FASTWRT tokioctl operation can be called from the kernel-mode process environment only.
Return Values
EFAULT |
Indicates that the specified address is not valid, or the calling
process is a user-mode process. |
EINVAL |
Indicates that the specified parameter is not valid. |
EIO |
Indicates that an error occurred. See the status field for more information. |
ENODEV |
Indicates that the specified minor number is not valid. |
ENXIO |
Indicates that an attempt was made to use an unconfigured device. |
Related Information
The tokfastwrt entry point, tokioctl
entry point, tokwrite entry
point.
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