Modify the transfer size of a transfer packet DCL (send or receive)
- macOS 10.1+
The local isoch port interface to use.
A pointer to the DCL to modify.
The new buffer to or from data will be transferred.
The new size of data to be transferred.
Returns kIOReturnSuccess on success. Will return an error if 'size' is too large or 'inDCL' does not point to a valid transfer packet DCL, or the range specified by [buffer, buffer+size] is not in the range of memory locked down for this program.
Allows you to modify transfer packet DCLs after they have been compiled and while the DCL program is still running. The transfer size can be set to any size less than or equal to the size set when the DCL program was compiled (including 0).
Availability: IOFireWireLocalIsochPortInterface_v3 and newer.