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This part of the copyright blurb stems from the GPL use recommendations: https://www.gnu.org/licenses/gpl-howto.en.html The concept appears to originate in times where version control was per file, instead of per tree, and was a way to glue the files together. Ultimately, we nowadays don't live in that world anymore, and this information is entirely useless anyway, as people are very welcome to copy these files into any projects they like, and they shouldn't have to change bits that are part of our copyright header for that. hence, let's just get rid of this old cruft, and shorten our codebase a bit.
353 lines
12 KiB
XML
353 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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Copyright 2012 Zbigniew Jędrzejewski-Szmek
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-->
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<refentry id="coredumpctl" conditional='ENABLE_COREDUMP'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>coredumpctl</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>coredumpctl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>coredumpctl</refname>
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<refpurpose>Retrieve and process saved core dumps and metadata</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>coredumpctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="req">COMMAND</arg>
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<arg choice="opt" rep="repeat">PID|COMM|EXE|MATCH</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>coredumpctl</command> is a tool that can be used to retrieve and process core
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dumps and metadata which were saved by
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<varlistentry>
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<term><option>--no-legend</option></term>
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<listitem><para>Do not print column headers.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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<varlistentry>
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<term><option>-1</option></term>
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<listitem><para>Show information of a single core dump only, instead of listing
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all known core dumps.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-S</option></term>
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<term><option>--since</option></term>
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<listitem><para>Only print entries which are since the specified date.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-U</option></term>
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<term><option>--until</option></term>
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<listitem><para>Only print entries which are until the specified date.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--reverse</option></term>
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<listitem><para>Reverse output so that the newest entries are displayed first.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-F</option> <replaceable>FIELD</replaceable></term>
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<term><option>--field=</option><replaceable>FIELD</replaceable></term>
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<listitem><para>Print all possible data values the specified
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field takes in matching core dump entries of the
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journal.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-o</option> <replaceable>FILE</replaceable></term>
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<term><option>--output=</option><replaceable>FILE</replaceable></term>
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<listitem><para>Write the core to <option>FILE</option>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--debugger=</option><replaceable>DEBUGGER</replaceable></term>
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<listitem><para>Use the given debugger for the <command>debug</command>
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command. If not given and <varname>$SYSTEMD_DEBUGGER</varname> is unset, then
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<citerefentry><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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will be used. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-D</option> <replaceable>DIR</replaceable></term>
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<term><option>--directory=</option><replaceable>DIR</replaceable></term>
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<listitem><para>Use the journal files in the specified <option>DIR</option>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--quiet</option></term>
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<listitem><para>Suppresses informational messages about lack
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of access to journal files and possible in-flight coredumps.
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</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>list</command></term>
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<listitem><para>List core dumps captured in the journal
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matching specified characteristics. If no command is
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specified, this is the implied default.</para>
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<para>The output is designed to be human readable and contains list contains
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a table with the following columns:</para>
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<variablelist>
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<varlistentry>
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<term>TIME</term>
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<listitem><para>The timestamp of the crash, as reported by the kernel.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>PID</term>
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<listitem><para>The identifier of the process that crashed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>UID</term>
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<term>GID</term>
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<listitem><para>The user and group identifiers of the process that crashed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>SIGNAL</term>
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<listitem><para>The signal that caused the process to crash, when applicable.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>COREFILE</term>
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<listitem><para>Information whether the coredump was stored, and whether
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it is still accessible: <literal>none</literal> means the core was
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not stored, <literal>-</literal> means that it was not available (for
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example because the process was not terminated by a signal),
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<literal>present</literal> means that the core file is accessible by the
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current user, <literal>journal</literal> means that the core was stored
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in the <literal>journal</literal>, <literal>truncated</literal> is the
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same as one of the previous two, but the core was too large and was not
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stored in its entirety, <literal>error</literal> means that the core file
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cannot be accessed, most likely because of insufficient permissions, and
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<literal>missing</literal> means that the core was stored in a file, but
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this file has since been removed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>EXE</term>
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<listitem><para>The full path to the executable. For backtraces of scripts
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this is the name of the interpreter.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>It's worth noting that different restrictions apply to
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data saved in the journal and core dump files saved in
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<filename>/var/lib/systemd/coredump</filename>, see overview in
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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Thus it may very well happen that a particular core dump is still listed
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in the journal while its corresponding core dump file has already been
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removed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>info</command></term>
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<listitem><para>Show detailed information about core dumps
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captured in the journal.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>dump</command></term>
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<listitem><para>Extract the last core dump matching specified
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characteristics. The core dump will be written on standard
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output, unless an output file is specified with
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<option>--output=</option>. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>debug</command></term>
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<listitem><para>Invoke a debugger on the last core dump
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matching specified characteristics. By default,
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<citerefentry><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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will be used. This may be changed using the <option>--debugger=</option>
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option or the <varname>$SYSTEMD_DEBUGGER</varname> environment
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variable.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Matching</title>
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<para>A match can be:</para>
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<variablelist>
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<varlistentry>
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<term><replaceable>PID</replaceable></term>
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<listitem><para>Process ID of the
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process that dumped
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core. An integer.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>COMM</replaceable></term>
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<listitem><para>Name of the executable (matches
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<option>COREDUMP_COMM=</option>). Must not contain slashes.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>EXE</replaceable></term>
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<listitem><para>Path to the executable (matches
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<option>COREDUMP_EXE=</option>). Must contain at least one
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slash. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>MATCH</replaceable></term>
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<listitem><para>General journalctl predicate (see
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>).
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Must contain an equals sign (<literal>=</literal>).</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned; otherwise, a non-zero failure
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code is returned. Not finding any matching core dumps is treated as
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failure.
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</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$SYSTEMD_DEBUGGER</varname></term>
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<listitem><para>Use the given debugger for the <command>debug</command>
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command. See the <option>--debugger=</option> option.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>List all the core dumps of a program named foo</title>
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<programlisting># coredumpctl list foo</programlisting>
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</example>
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<example>
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<title>Invoke gdb on the last core dump</title>
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<programlisting># coredumpctl debug</programlisting>
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</example>
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<example>
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<title>Show information about a process that dumped core,
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matching by its PID 6654</title>
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<programlisting># coredumpctl info 6654</programlisting>
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</example>
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<example>
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<title>Extract the last core dump of /usr/bin/bar to a file named
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<filename noindex="true">bar.coredump</filename></title>
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<programlisting># coredumpctl -o bar.coredump dump /usr/bin/bar</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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