Devices Purpose Allows receive application data to be read using a file descriptor. When attempting to read an empty receive data queue, the default action is to delay until data is available. A complete receive packet must fit into the user's read data area. Contains the byte count of the user data area. Specifies the extended subroutine parameter.
All excess data is lost.
Each GDLC supports the readx subroutine interface via its dlcread entry point. This subroutine can be called from the process environment only. The open subroutine, readx subroutine. The uiomove kernel service.