NAME¶
dccpcli - DCCP-based BP convergence layer input task
SYNOPSIS¶
dccpcli local_hostname[:
local_port_nbr]
DESCRIPTION¶
dccpcli is a background "daemon" task that receives DCCP
datagrams via a DCCP socket bound to
local_hostname and
local_port_nbr, extracts bundles from those datagrams, and passes them
to the bundle protocol agent on the local ION node.
If not specified, port number defaults to 4556.
Note that
dccpcli has no fragmentation support at all. Therefore, the
largest bundle that can be sent via this convergence layer is limited to just
under the link's MTU (typically 1500 bytes).
The convergence layer input task is spawned automatically by
bpadmin in
response to the 's' (START) command that starts operation of the Bundle
Protocol; the text of the command that is used to spawn the task must be
provided at the time the "dccp" convergence layer protocol is added
to the BP database. The convergence layer input task is terminated by
bpadmin in response to an 'x' (STOP) command.
dccpcli can also
be spawned and terminated in response to START and STOP commands that pertain
specifically to the DCCP convergence layer protocol.
EXIT STATUS¶
- 0
- dccpcli 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
bpadmin to restart dccpcli.
- 1
- dccpcli terminated abnormally, for reasons noted in
the ion.log file. Investigate and solve the problem identified in
the log file, then use bpadmin to restart dccpcli.
FILES¶
No configuration files are needed.
ENVIRONMENT¶
No environment variables apply.
DIAGNOSTICS¶
The following diagnostics may be issued to the
ion.log log file:
- dccpcli can't attach to BP.
- bpadmin has not yet initialized Bundle Protocol
operations.
- No such dccp duct.
- No DCCP induct matching local_hostname and
local_port_nbr has been added to the BP database. Use
bpadmin to stop the DCCP convergence-layer protocol, add the
induct, and then restart the DCCP protocol.
- CLI task is already started for this duct.
- Redundant initiation of dccpcli.
- dccpcli can't get IP address for host.
- Operating system error. Check errtext, correct problem, and
restart dccpcli.
- CLI can't open DCCP socket. This probably means DCCP is not
supported on your system.
- Operating system error. This probably means that you are
not using an operating system that supports DCCP. Make sure that you are
using a current Linux kernel and that the DCCP modules are being compiled.
Check errtext, correct problem, and restart dccpcli.
- CLI can't initialize socket.
- Operating system error. Check errtext, correct problem, and
restart dccpcli.
- dccpcli can't get acquisition work area.
- ION system error. Check errtext, correct problem, and
restart dccpcli.
- dccpcli can't create new thread.
- Operating system error. Check errtext, correct problem, and
restart dccpcli.
BUGS¶
Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>
SEE ALSO¶
bpadmin(1),
bprc(5),
dccpclo(1)