The dlc prefix is replaced with the three-digit prefix for the specific GDLC device manager being read. The dlcread entry point is called when a user application program invokes the readx subroutine.
All receive data is returned to the user in the same order as received.
This must be set to a value of 1. Vectored read operations are not supported. Contains the starting address and length of the received data. This field is a variable in the iovec structure. Contains the byte length of the data.