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.\" ========================================================================
.\"
.IX Title "DTPCCLOCK 1"
.TH DTPCCLOCK 1 "2016-07-07" "perl v5.24.1" "DTPC executables"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
dtpcclock \- DTPC daemon task for managing scheduled events
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBdtpcclock\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBdtpcclock\fR is a background \*(L"daemon\*(R" task that periodically performs
scheduled \s-1DTPC\s0 activities.  It is spawned automatically by \fBdtpcadmin\fR in
response to the 's' command that starts operation of the \s-1DTPC\s0 protocol, and
it is terminated by \fBdtpcadmin\fR in response to an 'x' (\s-1STOP\s0) command.
.PP
Once per second, \fBdtpcclock\fR takes the following action:
.Sp
.RS 4
First it executes all \s-1DTPC\s0 events scheduled to occur at any time up to the
current moment:
.Sp
.RS 4
\&\s-1DTPC\s0 ADUs for which an expected positive acknowledgment has not yet arrived
are retransmitted.
.Sp
Received \s-1DTPC\s0 ADUs whose time to live has elapsed are deleted.
.RE
.RE
.RS 4
.Sp
Then \fBdtpcclock\fR increases the ages of all \s-1DTPC\s0 ADUs pending transmission
and initiates transmission of each such \s-1ADU\s0 whose age now equals or exceeds
its aggregation time limit.
.RE
.SH "EXIT STATUS"
.IX Header "EXIT STATUS"
.ie n .IP "0" 4
.el .IP "\f(CW0\fR" 4
.IX Item "0"
\&\fBdtpcclock\fR terminated, for reasons noted in the \fBion.log\fR file.  If this
termination was not commanded, investigate and solve the problem identified
in the log file and use \fBdtpcadmin\fR to restart \fBdtpcclock\fR.
.ie n .IP "1" 4
.el .IP "\f(CW1\fR" 4
.IX Item "1"
\&\fBdtpcclock\fR was unable to attach to \s-1DTPC\s0 protocol operations, probably because
\&\fBdtpcadmin\fR has not yet been run.
.SH "FILES"
.IX Header "FILES"
No configuration files are needed.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
No environment variables apply.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
The following diagnostics may be issued to the \fBion.log\fR log file:
.IP "dtpcclock can't initialize \s-1DTPC.\s0" 4
.IX Item "dtpcclock can't initialize DTPC."
\&\fBdtpcadmin\fR has not yet initialized \s-1DTPC\s0 protocol operations.
.IP "Can't send finished adu." 4
.IX Item "Can't send finished adu."
An unrecoverable database error was encountered.  \fBdtpcclock\fR terminates.
.IP "Can't stop aggregation for adu." 4
.IX Item "Can't stop aggregation for adu."
An unrecoverable database error was encountered.  \fBdtpcclock\fR terminates.
.IP "Could not scan outbound Adus" 4
.IX Item "Could not scan outbound Adus"
An unrecoverable database error was encountered.  \fBdtpcclock\fR terminates.
.SH "BUGS"
.IX Header "BUGS"
Report bugs to <ion\-bugs@korgano.eecs.ohiou.edu>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIdtpcadmin\fR\|(1)