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| <html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>dumper</title><link rel="stylesheet" type="text/css" href="docbook.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="cygwin-ug-net.html" title="Cygwin User's Guide"><link rel="up" href="using-utils.html" title="Cygwin Utilities"><link rel="prev" href="cygpath.html" title="cygpath"><link rel="next" href="getconf.html" title="getconf"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">dumper</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="cygpath.html">Prev</a> </td><th width="60%" align="center">Cygwin Utilities</th><td width="20%" align="right"> <a accesskey="n" href="getconf.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="dumper"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>dumper — Dump core from WIN32PID to FILENAME.core</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">dumper</code> [-n] [-d] [-q] <em class="replaceable"><code>FILENAME</code></em> <em class="replaceable"><code>WIN32PID</code></em> </p></div><div class="cmdsynopsis"><p><code class="command">dumper</code> -h | -V </p></div></div><div class="refsect1"><a name="dumper-options"></a><h2>Options</h2><pre class="screen"> |
| -n, --nokill don't terminate the dumped process |
| -d, --verbose be verbose while dumping |
| -h, --help output help information and exit |
| -q, --quiet be quiet while dumping (default) |
| -V, --version output version information and exit |
| </pre></div><div class="refsect1"><a name="dumper-desc"></a><h2>Description</h2><p>The <span class="command"><strong>dumper</strong></span> utility can be used to create a core |
| dump of running Windows process. This core dump can be later loaded into |
| <span class="command"><strong>gdb</strong></span> and analyzed. |
| </p><p> |
| If the core file size limit is set to unlimited (e.g. <span class="command"><strong>ulimit -c |
| unlimited</strong></span>) and an <code class="literal">error_start</code> executable |
| hasn't been configured in the <code class="literal">CYGWIN</code> environment |
| variable, Cygwin will automatically run <span class="command"><strong>dumper</strong></span> when a |
| fatal error occurs. |
| </p><p> <span class="command"><strong>dumper</strong></span> can be also be started from the command |
| line to create a core dump of any running process.</p><p>For historical reasons, unless the <code class="literal">-n</code> option |
| is given, after the core dump is created and when the |
| <span class="command"><strong>dumper</strong></span> exits, the target process is also |
| terminated.</p><p> To save space in the core dump, <span class="command"><strong>dumper</strong></span> doesn't |
| write those portions of the target process's memory space that were loaded |
| from executable and dll files and are unchanged (e.g. program code). |
| Instead, <span class="command"><strong>dumper</strong></span> saves paths to the files which |
| contain that data. When a core dump is loaded into gdb, it uses these |
| paths to load the appropriate files. That means that if you create a core |
| dump on one machine and try to debug it on another, you'll need to place |
| identical copies of the executable and dlls in the same directories as on |
| the machine where the core dump was created. |
| </p></div><div class="refsect1"><a name="dumper-notes"></a><h2>Notes</h2><p> |
| A Cygwin "core dump file" is an ELF file containing the mutable parts of |
| the process memory and special note sections which capture the process, |
| thread and loaded module context needed to recreate the process image in a |
| debugger. |
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