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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 2

dd_fastwrt Communications PDH Entry Point


Allows kernel-mode users to transmit data.


You use the dd_fastwrt entry point from a kernel-mode process to pass a write packet or string of packets to a PDH for transmission. To get the address of this entry point, you issue the fp_ioctl (CIO_GET_FASTWRT) kernel service.

The syntax and rules of usage are device-dependent and therefore not listed here. See the documentation on individual devices for more information. Some of the information that should be provided is:

When you call this entry point from a different adapter's receive interrupt level, you must ensure that the calling level is equal to or lower than the target adapter's operational level. This is the case when you forward packets from one port to another. To find out the operational level, see the documentation for the specific device.

Related Information

The fp_ioctl kernel service.

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