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<title>Trace Common Programming Interface (CPI) Communications (TRCCPIC) command</title>
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<h4 id="rzajtprb-comtraceinstss">Trace Common Programming Interface (CPI) Communications (TRCCPIC) command</h4>
<p>You can start to trace Common Programming Interface (CPI) Communications
either before running a job or after a job is active to find out where the
error might have occurred. The TRCCPIC command captures information about
CPI-Communications calls that are processed by your program. The system collects
trace information in a current job, or in a job that is serviced by a Start
Service Job (STRSRVJOB) command. (For a CPI Communication program you could
trace a job that is started as a result of a received program start request.)
You can issue the TRCCPIC command in one of the following ways: </p>
<ul>
<li>Using the System Menu</li>
<li>Typing TRCCPIC *ON on a command line</li>
<li>Adding the TRCCPIC command to a control language (CL) or a REstructured
eXtended eXecutor (REXX) program</li>
<li>Typing TRCCPIC on the command line and pressing F4 (Prompt)</li></ul><p class="indatacontent">If you type TRCCPIC on the command line and press F4, an initial prompt
is displayed for the <span class="italic">Trace Option Setting</span>. If *ON
is specified and you press enter, the Trace CPI Communications display appears.</p>
<p>This display enables you to set the following parameters: </p>
<dl class="parml">
<dt class="bold">Trace option setting</dt>
<dd>Specifies whether the collection of trace information is to be started,
stopped, or ended.
<dl class="parml">
<dt class="bold"><span class="pkdef">*ON</span></dt>
<dd>Starts Trace CPI Communications. This is the default value for the command.
</dd>
<dt class="bold">*OFF</dt>
<dd>Stops Trace CPI Communications. The current information is written to
the spooled printer file or to the database file, and the trace table. The
trace information is then deleted.
</dd>
<dt class="bold">*END</dt>
<dd>Ends Trace CPI Communications. The trace table and all trace information
are destroyed.
</dd>
</dl>
</dd>
<dt class="bold">Maximum storage to use</dt>
<dd>Specifies the maximum amount of storage to use for the trace information
collected. The prompt appears only if you have selected *ON for the <span class="italic">Trace option setting</span> prompt.
<dl class="parml">
<dt class="bold"><span class="pkdef">200 K</span></dt>
<dd>The number of bytes (1 K equals 1024 bytes) of storage. This is the
default value.
</dd>
<dt class="bold">1-16000 K</dt>
<dd>The valid range for the maximum number of bytes used for storing collected
trace information.
</dd>
</dl>
</dd>
<dt class="bold">Trace full</dt>
<dd>Specifies whether new trace records replace old trace records or whether
the trace is stopped when the maximum storage that you specified has been
reached. This prompt appears only if you have selected *ON for the <span class="italic">Trace option setting</span> prompt.
<dl class="parml">
<dt class="bold"><span class="pkdef">*WRAP</span></dt>
<dd>When the trace storage area is full, new trace information is written
over the old trace information, starting at the beginning of the storage area.
This is the default value.
</dd>
<dt class="bold">*STOPTRC</dt>
<dd>No new trace information is saved when the trace storage area is full.
You must reissue the TRCCPIC command, specifying (*OFF) for the SET parameter,
to retrieve the output of the trace information collected in the trace storage
area.
</dd>
</dl>
</dd>
<dt class="bold">User data length</dt>
<dd>Specifies the maximum length of user data to be saved for each trace
record in the storage area. This prompt affects only the tracing of user data
on the Send_Data and Receive calls. This parameter does not affect the tracing
of log data on Set_Log_Data, Send_Error, or Deallocate calls. This prompt
appears only if you specified *ON on the <span class="italic">Trace option setting</span> prompt.
<dl class="parml">
<dt class="bold"><span class="pkdef">128</span></dt>
<dd>The number of bytes for the user data length. This is the default value.
</dd>
<dt class="bold">0-4096</dt>
<dd>The valid range of bytes for the user data length.
</dd>
</dl>
</dd>
</dl>
<p>Trace Common Programming Interface (CPI) Communications continues to collect
trace records until you stop the trace or until the trace storage area becomes
full. The amount of trace storage depends on the value that is specified on
the <span class="italic">Trace full</span> prompt. If the trace storage area becomes
full and the collection of trace records stops, you must enter the TRCCPIC
command again to create output. The output that is created by the TRCCPIC
command is directed either to the spooled printer file, QSYSPRT, or to a database
output file that you specify. If the output file that you specify already
exists, it must have the same attributes as the system-supplied file, QACM0TRC.</p>
<p>You can stop a trace procedure in one of the following ways: </p>
<ul>
<li>Using the System Menu</li>
<li>Typing TRCCPIC *OFF on the command line</li>
<li>Adding the TRCCPIC command to a CL or a REXX program</li>
<li>Typing TRCCPIC on the command line and pressing F4 (Prompt)</li></ul><p class="indatacontent">Type TRCCPIC on the command line and press F4. Specify *OFF for the <span class="italic">Trace option setting</span> and you are prompted for the OUTPUT
parameter.</p>
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