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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
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<td width="80%" align="center" valign="bottom">Chapter
13. Spool Queues and Files</td>
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<div class="SECT1">
<h1 class="SECT1"><a name="QUEUECONTROLFILE">13.3. Spool
Control File</a></h1>
<ul>
<li>
<p><tt class="LITERAL">spool_control_file</tt><i class=
"EMPHASIS">spool queue control file - default
control.%P</i></p>
</li>
</ul>
<br>
<br>
<p>The spool control file is used to control the operations
of the spooler, and is in the spool or control directory. The
file name specified by the <tt class=
"LITERAL">queue_control_file</tt> option (default <tt class=
"LITERAL">control.%P</tt> - the %P is expanded to the print
queue name); in our example, the control file would be: <tt
class="FILENAME">/var/lpd/pr/control.pr</tt>.</p>
<p>The <b class="APPLICATION">lpc</b> program sends spool
control requests to the <b class="APPLICATION">lpd</b>
daemon, which updates the control file and then signals the
appropriate spool server processes that an update has been
performed. The control file contents have the form:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN6303"></a>
<pre class="SCREEN">
key value
</pre>
</div>
<br>
<br>
<p>The following keys and their values are currently
supported.</p>
<div class="INFORMALTABLE">
<a name="AEN6306"></a>
<table border="1" class="CALSTABLE">
<thead>
<tr>
<th align="LEFT" valign="TOP">Key</th>
<th align="LEFT" valign="TOP">Value</th>
<th align="LEFT" valign="TOP">Purpose</th>
</tr>
</thead>
<tbody>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">printing_disabled</tt></td>
<td align="LEFT" valign="TOP">0 or 1</td>
<td align="LEFT" valign="TOP">disable printing of
jobs in queue</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">spooling_disabled</tt></td>
<td align="LEFT" valign="TOP">0 or 1</td>
<td align="LEFT" valign="TOP">disable placing jobs in
queue</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">holdall</tt></td>
<td align="LEFT" valign="TOP">0 or 1</td>
<td align="LEFT" valign="TOP">hold jobs until
released</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">redirect</tt></td>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">printer</tt></td>
<td align="LEFT" valign="TOP">transfer jobs to
indicated printer</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">class</tt></td>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">glob expression</tt></td>
<td align="LEFT" valign="TOP">print only jobs whose
class matches glob expression</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">server_order</tt></td>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">printer name list</tt></td>
<td align="LEFT" valign="TOP">preferred order of
printer use</td>
</tr>
<tr>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">debug</tt></td>
<td align="LEFT" valign="TOP"><tt class=
"LITERAL">debugging options</tt></td>
<td align="LEFT" valign="TOP">debugging and
tracing</td>
</tr>
</tbody>
</table>
</div>
<p>The <tt class="LITERAL">printing_disabled</tt> and <tt
class="LITERAL">spooling_disabled</tt> are managed using the
<tt class="COMMAND">lpc start</tt>, <tt class="COMMAND">lpc
stop</tt>, <tt class="COMMAND">lpc enable</tt> and <tt class=
"COMMAND">lpc disable</tt> commands. Similarly, <tt class=
"LITERAL">holdall</tt> is enabled and disabled by <tt class=
"LITERAL">holdall</tt> and <tt class="LITERAL">noholdall</tt>
commands respectively. When holdall is enabled, jobs placed
in the print queue will be held until they are explicitly
released for printing by an <tt class="COMMAND">lpc
release</tt> command.</p>
<p>The <tt class="LITERAL">redirect</tt> entry is used to
redirect or transfer jobs which are spooled to this queue to
another queue, and is managed by the redirect command. The
<tt class="COMMAND">lpc redirect off</tt> removes the
redirect entry from the control file.</p>
<p>The <tt class="LITERAL">class</tt> entry is similar in
operation to the <tt class="LITERAL">holdall</tt>, but allows
jobs whose class identification matches the glob expression
to be printed. This can be useful when you have special forms
or paper required for a print job, and want to run only these
jobs when the paper is in the printer.</p>
<p>The <tt class="LITERAL">server_order</tt> entry is created
and updated for a multiple printer queue. It records the
order in which printers should next be used for normal print
operations. This allows <i class="EMPHASIS">round robin</i>
use of printers, rather than having all jobs printed to the
first printer in the list of printers.</p>
<p>The <tt class="LITERAL">debug</tt> entry is set by the <tt
class="COMMAND">lpc debug</tt> command, and is used to enable
or disable debugging and tracing information for a spool
queue. This facility is for diagnostic purposes only.</p>
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