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84 lines
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<title>gcore man - Debugging with GDB</title>
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<div class="node">
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<a name="gcore-man"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="gdbinit-man.html#gdbinit-man">gdbinit man</a>,
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Previous: <a rel="previous" accesskey="p" href="gdbserver-man.html#gdbserver-man">gdbserver man</a>,
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Up: <a rel="up" accesskey="u" href="Man-Pages.html#Man-Pages">Man Pages</a>
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<hr>
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</div>
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<h3 class="heading">gcore</h3>
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<!-- man title gcore Generate a core file of a running program -->
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<pre class="format"><!-- man begin SYNOPSIS gcore -->
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gcore [-a] [-o <var>prefix</var>] <var>pid1</var> [<var>pid2</var>...<var>pidN</var>]
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<!-- man end -->
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</pre>
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<!-- man begin DESCRIPTION gcore -->
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<p>Generate core dumps of one or more running programs with process IDs
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<var>pid1</var>, <var>pid2</var>, etc. A core file produced by <samp><span class="command">gcore</span></samp>
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is equivalent to one produced by the kernel when the process crashes
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(and when <kbd>ulimit -c</kbd> was used to set up an appropriate core dump
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limit). However, unlike after a crash, after <samp><span class="command">gcore</span></samp> finishes
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its job the program remains running without any change.
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<!-- man end -->
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<!-- man begin OPTIONS gcore -->
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<dl>
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<dt><samp><span class="env">-a</span></samp><dd>Dump all memory mappings. The actual effect of this option depends on
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the Operating System. On <span class="sc">gnu</span>/Linux, it will disable
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<code>use-coredump-filter</code> (see <a href="set-use_002dcoredump_002dfilter.html#set-use_002dcoredump_002dfilter">set use-coredump-filter</a>) and
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enable <code>dump-excluded-mappings</code> (see <a href="set-dump_002dexcluded_002dmappings.html#set-dump_002dexcluded_002dmappings">set dump-excluded-mappings</a>).
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<br><dt><samp><span class="env">-o </span><var>prefix</var></samp><dd>The optional argument <var>prefix</var> specifies the prefix to be used
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when composing the file names of the core dumps. The file name is
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composed as <samp><var>prefix</var><span class="file">.</span><var>pid</var></samp>, where <var>pid</var> is the
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process ID of the running program being analyzed by <samp><span class="command">gcore</span></samp>.
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If not specified, <var>prefix</var> defaults to <var>gcore</var>.
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</dl>
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<!-- man end -->
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<!-- man begin SEEALSO gcore -->
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<!-- man end -->
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</body></html>
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