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<th colspan="3" align="center">LPRng-HOWTO: 8 Feb 2002
(For LPRng-3.8.6)</th>
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<h1 class="SECT1"><a name="DEBUGGING">15.11.
Debugging</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">debugging=</tt><i class=
"EMPHASIS">debugging options</i></p>
</li>
<li>
<p><tt class="LITERAL">full_time</tt> FLAG <i class=
"EMPHASIS">full or extended time format</i></p>
</li>
<li>
<p><tt class="LITERAL">ms_time_resolution</tt> FLAG <i
class="EMPHASIS">millisecond time resolution</i></p>
</li>
<li>
<p><tt class="LITERAL">syslog_device=</tt><i class=
"EMPHASIS">syslog alternative device</i></p>
</li>
<li>
<p><tt class="LITERAL">use_date</tt> FLAG <i class=
"EMPHASIS">put date information in control file</i></p>
</li>
<li>
<p><tt class="LITERAL">use_info_cache</tt> FLAG <i class=
"EMPHASIS">cache printcap and other information</i></p>
</li>
</ul>
<br>
<br>
<p>The <b class="APPLICATION">LPRng</b> software has a very
powerful debugging capability. Since most printing problems
occur on remote systems where it is impossible to run
debuggers, and since most systems do not do core dumps of
SETUID ROOT programs, the <b class="APPLICATION">LPRng</b>
software provides a very verbose set of log file trace
messages.</p>
<p>First, serious errors or other information are logged
using the <tt class="FUNCTION">syslog()</tt> facilities. If
these are not present on a system, then the messages are
logged to the device specified by <tt class=
"LITERAL">syslog_device</tt>.</p>
<p>For client programs, the debugging options are specified
on the command line and output is directed to <span class=
"ACRONYM">STDERR</span>. For the <b class=
"APPLICATION">lpd</b> server, debugging commands can be
specified on the command line OR as the <tt class=
"LITERAL">db=options</tt> printcap value. Output is directed
to the log file (<tt class="LITERAL">lf</tt> option value,
default log).</p>
<p>A typical debug entry has the format <tt class=
"LITERAL">2,network+1,database</tt>. This sets the general
debugging level to 2, network debugging to 1 and the database
debugging level to the default. The following debugging
options and levels are supported.</p>
<ul>
<li>
<p>nnn - general purpose debugging level</p>
</li>
<li>
<p>network - network debugging</p>
</li>
<li>
<p>database - database debugging</p>
</li>
<li>
<p>receive - job or command reception debugging</p>
</li>
<li>
<p>print - detailed job printing debugging</p>
</li>
</ul>
<br>
<br>
<p>The <tt class="LITERAL">full_time</tt> flag forces the
logging and other information which has timestamps to have a
full (year, month, day, etc.) timestamp. The <tt class=
"LITERAL">ms_time_resolution</tt> flag forces millisecond
time resolution in the time stamp. The <tt class=
"LITERAL">use_date</tt> flag forces a date value to be placed
in a control file if there is none.</p>
<p>The <tt class="LITERAL">use_info_cache</tt> (default ON)
causes <b class="APPLICATION">lpd</b> to cache printcap and
configuration information. This is desirable except when
trying to change values in printcap files and test the
results. By using <tt class="LITERAL">use_info_cache@</tt> in
the configuration information, you can get immediate
responses. Also, see <a href="lpcreread.htm">lpc reread</a>
for another method.</p>
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