journal: add tool to extract coredumps

'systemd-coredumpctl' will list available coredumps:
   PID   UID   GID sig exe
 32452  500  500  11 /home/zbyszek/systemd/build/journalctl
 32666  500  500  11 /usr/lib64/valgrind/memcheck-amd64-linux
...

'systemd-coredumpctl dump PID' will write the coredump
to specified file or stdout.

1 files changed, 186 insertions, 0 deletions

diff --git a/man/systemd-coredumpctl.xml b/man/systemd-coredumpctl.xml
new file mode 100644
index 0000000000..378d40fa13
--- /dev/null
+++ b/man/systemd-coredumpctl.xml
@@ -0,0 +1,186 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2012 Zbigniew Jędrzejewski-Szmek
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-coredumpctl">
+
+        <refentryinfo>
+                <title>systemd-coredumpctl</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Zbigniew</firstname>
+                                <surname>Jędrzejewski-Szmek</surname>
+                                <email>zbyszek@in.waw.pl</email>
+                        </author>
+                </authorgroup>
+        </refentryinfo>
+
+        <refmeta>
+                <refentrytitle>systemd-coredumpctl</refentrytitle>
+                <manvolnum>1</manvolnum>
+        </refmeta>
+
+        <refnamediv>
+                <refname>systemd-coredumpctl</refname>
+                <refpurpose>Retrieve coredumps from the journal</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <cmdsynopsis>
+                        <command>systemd-coredumpctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg> <arg choice="opt" rep="repeat">PID|COMM|EXE|MATCH</arg></command>
+                </cmdsynopsis>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para><command>systemd-coredumpctl</command> may be used to
+                retrieve coredumps from
+                <citerefentry><refentrytitle>systemd-journald</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>Options</title>
+
+                <para>The following options are understood:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><option>--help</option></term>
+                                <term><option>-h</option></term>
+
+                                <listitem><para>Print a short help
+                                text and exit.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--version</option></term>
+
+                                <listitem><para>Print a short version
+                                string and exit.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--output=FILE</option></term>
+                                <term><option>-o FILE</option></term>
+
+                                <listitem><para>Write the core to
+                                <option>FILE</option>.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--no-pager</option></term>
+
+                                <listitem><para>Do not pipe output of
+                                <command>list</command> into a
+                                pager.</para></listitem>
+                        </varlistentry>
+
+                </variablelist>
+
+                <para>The following commands are understood:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><command>list</command></term>
+
+                                <listitem><para>List coredumps captured in the journal
+                                matching specified characteristics.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><command>dump</command></term>
+
+                                <listitem><para>Extract the last coredump
+                                matching specified characteristics.
+                                Coredump will be written on stdout, unless
+                                an output file is specified with
+                                <option>-o/--output</option>.
+                                </para></listitem>
+                        </varlistentry>
+
+                </variablelist>
+
+        </refsect1>
+
+        <refsect1>
+                <title>Matching</title>
+
+                <para>Match can be:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><option>PID</option></term>
+
+                                <listitem><para>Process ID of the
+                                process that dumped
+                                core. An integer.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>COMM</option></term>
+
+                                <listitem><para>Name of the executable
+                                (matches <option>COREDUMP_COMM=</option>).
+                                Must not contain slashes.
+                                </para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>EXE</option></term>
+
+                                <listitem><para>Path to the executable
+                                (matches <option>COREDUMP_EXE=</option>).
+                                Must contain at least one slash.
+                                </para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>MATCH</option></term>
+
+                                <listitem><para>General journalctl predicates
+                                (see <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>).
+                                Must contain an equals sign.
+                                </para></listitem>
+                        </varlistentry>
+                </variablelist>
+        </refsect1>
+
+        <refsect1>
+                <title>Exit status</title>
+                <para>On success 0 is returned, a non-zero failure
+                code otherwise. Not finding any mathing coredumps is treated
+		as failure.
+		</para>
+        </refsect1>
+
+        <refsect1>
+                <title>See Also</title>
+                <para>
+                        <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>