man: add systemd-coredump(8) and a bunch of links

Makefile-man.am

@@ -687,7 +687,8 @@ endif
 if ENABLE_COREDUMP
 MANPAGES += \
 	man/coredump.conf.5 \
-	man/coredumpctl.1
+	man/coredumpctl.1 \
+	man/systemd-coredump.8
 MANPAGES_ALIAS += \
 	#
 
@@ -1601,6 +1602,7 @@ EXTRA_DIST += \
 	man/systemd-cat.xml \
 	man/systemd-cgls.xml \
 	man/systemd-cgtop.xml \
+	man/systemd-coredump.xml \
 	man/systemd-cryptsetup-generator.xml \
 	man/systemd-cryptsetup@.service.xml \
 	man/systemd-debug-generator.xml \

man/coredumpctl.xml

@@ -210,6 +210,8 @@
         <refsect1>
                 <title>See Also</title>
                 <para>
+                        <citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                         <citerefentry project='man-pages'><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 </para>

man/journalctl.xml

@@ -908,6 +908,7 @@
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                 </para>

man/systemd-coredump.xml

@@ -0,0 +1,105 @@
+<?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 2014 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-coredump" conditional='ENABLE_COREDUMP'
+          xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>systemd-coredump</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-coredump</refentrytitle>
+    <manvolnum>8</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-coredump</refname>
+    <refpurpose>Log and store core dumps</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>/usr/lib/systemd/systemd-coredump</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>systemd-coredump</command> can be used as a helper
+    binary by the kernel when a user space program receives a fatal
+    signal and dumps core. For it to be used in this capacity, it must
+    be specified by the
+    <varname>kernel.core_pattern</varname> <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    setting. Systemd installs
+    <filename>/usr/lib/sysctl.d/50-coredump.conf</filename> which
+    configures <varname>kernel.core_pattern</varname> to invoke
+    <command>systemd-coredump</command>. This file may be masked or
+    overriden to use a different setting following normal
+    <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> rules.</para>
+
+    <para>The behaviour of a specific program upon reception of a
+    signal is governed by a few factors which are described in detail
+    in <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+    In particular, the coredump will only be processed when the
+    related resource limits are high enough. For programs started by
+    <command>systemd</command> those may be set using
+    <varname>LimitCore=</varname> (see
+    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
+    </para>
+
+    <para><command>systemd-coredump</command> will log the coredump
+    including a backtrace if possible, and store the core (contents of
+    process' memory contents) in an external file on disk in
+    <filename>/var/lib/systemd/coredump</filename>, or directly in
+    the journal. This behaviour may be modified using
+    <citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
+
+    <para>Apart from the
+    <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    log viewer,
+    <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    may be used to list and extract coredumps.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+    </para>
+  </refsect1>
+</refentry>

man/systemd-journald.service.xml

@@ -248,6 +248,7 @@
                         <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>setfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <command>pydoc systemd.journal</command>.
                 </para>

sysctl.d/50-coredump.conf.in

@@ -5,6 +5,8 @@
 #  the Free Software Foundation; either version 2.1 of the License, or
 #  (at your option) any later version.
 
-# See sysctl.d(5) and core(5) for for details.
+# See sysctl.d(5) for the description of the files in this directory,
+# and systemd-coredump(8) and core(5) for the explanation of the
+# setting below.
 
 kernel.core_pattern=|@rootlibexecdir@/systemd-coredump %p %u %g %s %t %e