+.th DPD VII 3/15/72
+.sh NAME
+dpd \*- spawn data phone daemon
+.sh SYNOPSIS
+.bd /etc/dpd
+.sh DESCRIPTION
+.it Dpd
+is the 201 data phone daemon.
+It is designed to submit jobs to
+the Honeywell 6070 computer via the GRTS
+interface.
+.s3
+.it Dpd
+uses the directory
+.it /usr/dpd.
+The file
+.it lock
+in that directory
+is used
+to prevent two daemons from becoming active.
+After the daemon has successfully set the lock,
+it forks and the main path exits, thus
+spawning the daemon.
+The directory is scanned for files
+beginning with
+.bd df.
+Each such file is submitted as a job.
+Each line of a job file must begin with a key
+character to specify what to do with the remainder
+of the line.
+.s3
+.lp +5 3
+\fBS\fR directs
+.it dpd
+to generate a unique snumb card.
+This card is generated by incrementing the first
+word of the
+file
+.it /usr/dpd/snumb
+and converting that to three-digit octal concatenated with
+the station ID.
+.s3
+.lp +5 3
+\fBL\fR specifies that the remainder of the line is to
+be sent as a literal.
+.s3
+.lp +5 3
+\fBB\fR specifies that the rest of the line
+is a file name.
+That file is to
+be sent as binary cards.
+.s3
+.lp +5 3
+\fBF\fR is the same as \fBB\fR except a form feed is prepended to the file.
+.s3
+.lp +5 3
+\fBU\fR specifies that the rest of the line
+is a file name.
+After the job has been transmitted,
+the file is unlinked.
+.s3
+.i0
+Any error encountered will cause the daemon to
+drop the call, wait up to 20 minutes and start over.
+This means that an improperly constructed
+\fIdf\fR file may cause the same job to be submitted
+every 20 minutes.
+.s3
+While waiting, the
+daemon checks to
+see that the
+.it lock
+file still exists.
+If it is gone,
+the
+daemon will exit.
+.sh FILES
+/dev/dn0,
+/dev/dp0,
+/usr/dpd/*
+.sh "SEE ALSO"
+opr(I)
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