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<title>Debugging with GDB: Trace Files</title>
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<a name="Trace-Files"></a>
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<div class="header">
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<p>
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Previous: <a href="Tracepoint-Variables.html#Tracepoint-Variables" accesskey="p" rel="previous">Tracepoint Variables</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Using-Trace-Files"></a>
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<h3 class="section">13.4 Using Trace Files</h3>
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<a name="index-trace-files"></a>
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<p>In some situations, the target running a trace experiment may no
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longer be available; perhaps it crashed, or the hardware was needed
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for a different activity. To handle these cases, you can arrange to
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dump the trace data into a file, and later use that file as a source
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of trace data, via the <code>target tfile</code> command.
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</p>
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<dl compact="compact">
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<dd>
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<a name="index-tsave"></a>
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</dd>
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<dt><code>tsave [ -r ] <var>filename</var></code></dt>
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<dt><code>tsave [-ctf] <var>dirname</var></code></dt>
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<dd><p>Save the trace data to <var>filename</var>. By default, this command
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assumes that <var>filename</var> refers to the host filesystem, so if
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necessary <small>GDB</small> will copy raw trace data up from the target and
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then save it. If the target supports it, you can also supply the
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optional argument <code>-r</code> (“remote”) to direct the target to save
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the data directly into <var>filename</var> in its own filesystem, which may be
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more efficient if the trace buffer is very large. (Note, however, that
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<code>target tfile</code> can only read from files accessible to the host.)
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By default, this command will save trace frame in tfile format.
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You can supply the optional argument <code>-ctf</code> to save data in CTF
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format. The <em>Common Trace Format</em> (CTF) is proposed as a trace format
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that can be shared by multiple debugging and tracing tools. Please go to
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‘<code>http://www.efficios.com/ctf</code>’ to get more information.
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</p>
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<a name="index-target-tfile"></a>
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<a name="index-tfile"></a>
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<a name="index-target-ctf"></a>
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<a name="index-ctf"></a>
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</dd>
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<dt><code>target tfile <var>filename</var></code></dt>
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<dt><code>target ctf <var>dirname</var></code></dt>
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<dd><p>Use the file named <var>filename</var> or directory named <var>dirname</var> as
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a source of trace data. Commands that examine data work as they do with
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a live target, but it is not possible to run any new trace experiments.
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<code>tstatus</code> will report the state of the trace run at the moment
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the data was saved, as well as the current trace frame you are examining.
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Both <var>filename</var> and <var>dirname</var> must be on a filesystem accessible to
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the host.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) target ctf ctf.ctf
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(gdb) tfind
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Found trace frame 0, tracepoint 2
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39 ++a; /* set tracepoint 1 here */
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(gdb) tdump
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Data collected at tracepoint 2, trace frame 0:
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i = 0
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a = 0
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b = 1 '\001'
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c = {"123", "456", "789", "123", "456", "789"}
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d = {{{a = 1, b = 2}, {a = 3, b = 4}}, {{a = 5, b = 6}, {a = 7, b = 8}}}
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(gdb) p b
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$1 = 1
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</pre></div>
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</dd>
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</dl>
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<p>
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Previous: <a href="Tracepoint-Variables.html#Tracepoint-Variables" accesskey="p" rel="previous">Tracepoint Variables</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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