SYNOPSIS
dtpcdDESCRIPTION
dtpcd is a background ``daemon'' task that manages the reception and processing of DTPC protocol data units. It receives the payloads of bundles destined for the ``ipn''-scheme endpoint whose node number is the number of the local node and whose service number is the DTPC_RECV_SVC_NBR (129 as of the time of this writeng).DTPC protocol data units are of two types: application data units (ADUs, i.e., aggregations of application data items) and acknowledgments. Each acknowledgment is interpreted as authorization to release the buffer space occupied by the node's local copy of the acknowledged ADU. Each ADU is parsed into its constituent application data items, which are then delivered to the applications awaiting them, and when required a DTPC end-to-end acknowledgment PDU is returned to the DTPC PDU sender.
EXIT STATUS
- 0
- dtpcd terminated normally, for reasons noted in the ion.log file. If this termination was not commanded, investigate and solve the problem identified in the log file and use dtpcadmin to restart dtpcd.
- 1
- dtpcd terminated abnormally, for reasons noted in the ion.log file. Investigate and solve the problem identified in the log file, then use dtpcadmin to restart dtpcd.
FILES
No configuration files are needed.ENVIRONMENT
No environment variables apply.DIAGNOSTICS
The following diagnostics may be issued to the ion.log log file:- DTPC can't open own 'send' endpoint.
- Bundle protocol agent has not been started. See ion(3).
- dtpcd can't attach to DTPC.
- dtpcadmin has not yet initialized DTPC protocol operations.