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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 2
IOCINFO (Describe Device) tokioctl Token-Ring Device Handler Operation
Purpose
Returns a structure that describes the token-ring device.
Description
The IOCINFO tokioctl operation returns a structure that describes the token-ring device. For this operation, the arg parameter points to the devinfo structure. This structure is defined in the /usr/include/sys/devinfo.h file and contains the following fields:
devtype |
Identifies the device type. The token-ring device type is DD_NET_DH. This value is defined in the /usr/include/sys/devinfo.h file. |
devsubtype |
Identifies the device subtype. The token-ring device subtype is DD_TR. This value is defined in the /usr/include/sys/devinfo.h file. |
speed |
Specifies the capabilities of the token-ring device. This is equal to TOK_4M when the token-ring device is configured with a data rate of 4 Mbps. The capabilities are TOK_16M when the token-ring device is configured with a data rate of 16 Mbps. The TOK_4M and TOK_16M labels are defined in the /usr/include/sys/tokuser.h file. |
broad_wrap |
Specifies whether the wrapping of broadcast packets is supported by the device. |
rdto |
Specifies the configured receive data transfer offset (RDTO) value. |
haddr |
Specifies the 6-byte hardware address of the token-ring adapter card. |
net_addr |
Specifies the 6-byte network address currently used by the token-ring device handler. |
The parameter block is filled in with the appropriate values upon return.
The IOCINFO tokioctl operation can be called from the process environment only.
Return Values
EFAULT |
Indicates the specified address is not valid. |
EINVAL |
Indicates a parameter is not valid. |
ENXIO |
Indicates the specified minor number is not valid. |
Implementation Specifics
The IOCINFO operation functions with a Token-Ring High-Performance Network Adapter that has been correctly configured for use on a qualified network. Consult adapter specifications for more information on configuring the adapter and network qualifications.
Related Information
The tokioctl entry point.
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