681eb9cf2b
In particular, use /lib/systemd instead of /usr/lib/systemd in distributions like Debian which still have not adopted a /usr merge setup. Use XML entities from man/custom-entities.ent to replace configured paths while doing XSLT processing of the original XML files. There was precedent of some files (such as systemd.generator.xml) which were already using this approach. This addresses most of the (manual) fixes from this patch: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/patches/Fix-paths-in-man-pages.patch?h=experimental-220 The idea of using generic XML entities was presented here: http://lists.freedesktop.org/archives/systemd-devel/2015-May/032240.html This patch solves almost all the issues, with the exception of: - Path to /bin/mount and /bin/umount. - Generic statements about preference of /lib over /etc. These will be handled separately by follow up patches. Tested: - With default configure settings, ran "make install" to two separate directories and compared the output to confirm they matched exactly. - Used a set of configure flags including $CONFFLAGS from Debian: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/rules Installed the tree and confirmed the paths use /lib/systemd instead of /usr/lib/systemd and that no other unexpected differences exist. - Confirmed that `make distcheck` still passes.
179 lines
6.7 KiB
XML
179 lines
6.7 KiB
XML
<?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" [
|
|
<!ENTITY % entities SYSTEM "custom-entities.ent" >
|
|
%entities;
|
|
]>
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Lennart Poettering
|
|
|
|
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="sd_watchdog_enabled"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_watchdog_enabled</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>sd_watchdog_enabled</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_watchdog_enabled</refname>
|
|
<refpurpose>Check whether the service manager expects watchdog keep-alive notifications from a service</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-daemon.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_watchdog_enabled</function></funcdef>
|
|
<paramdef>int <parameter>unset_environment</parameter></paramdef>
|
|
<paramdef>uint64_t *<parameter>usec</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
<para><function>sd_watchdog_enabled()</function> may be called by
|
|
a service to detect whether the service manager expects regular
|
|
keep-alive watchdog notification events from it, and the timeout
|
|
after which the manager will act on the service if it did not get
|
|
such a notification.</para>
|
|
|
|
<para>If the <varname>$WATCHDOG_USEC</varname> environment
|
|
variable is set, and the <varname>$WATCHDOG_PID</varname> variable
|
|
is unset or set to the PID of the current process, the service
|
|
manager expects notifications from this process. The manager will
|
|
usually terminate a service when it does not get a notification
|
|
message within the specified time after startup and after each
|
|
previous message. It is recommended that a daemon sends a
|
|
keep-alive notification message to the service manager every half
|
|
of the time returned here. Notification messages may be sent with
|
|
<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
with a message string of <literal>WATCHDOG=1</literal>.</para>
|
|
|
|
<para>If the <parameter>unset_environment</parameter> parameter is
|
|
non-zero, <function>sd_watchdog_enabled()</function> will unset
|
|
the <varname>$WATCHDOG_USEC</varname> and
|
|
<varname>$WATCHDOG_PID</varname> environment variables before
|
|
returning (regardless of whether the function call itself
|
|
succeeded or not). Those variables are no longer inherited by
|
|
child processes. Further calls to
|
|
<function>sd_watchdog_enabled()</function> will also return with
|
|
zero.</para>
|
|
|
|
<para>If the <parameter>usec</parameter> parameter is non-NULL,
|
|
<function>sd_watchdog_enabled()</function> will write the timeout
|
|
in µs for the watchdog logic to it.</para>
|
|
|
|
<para>To enable service supervision with the watchdog logic, use
|
|
<varname>WatchdogSec=</varname> in service files. See
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On failure, this call returns a negative errno-style error
|
|
code. If the service manager expects watchdog keep-alive
|
|
notification messages to be sent, > 0 is returned, otherwise 0
|
|
is returned. Only if the return value is > 0, the
|
|
<parameter>usec</parameter> parameter is valid after the
|
|
call.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Notes</title>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
|
|
|
|
<para>Internally, this functions parses the
|
|
<varname>$WATCHDOG_PID</varname> and
|
|
<varname>$WATCHDOG_USEC</varname> environment variable. The call
|
|
will ignore these variables if <varname>$WATCHDOG_PID</varname>
|
|
does not contain the PID of the current process, under the
|
|
assumption that in that case, the variables were set for a
|
|
different process further up the process tree.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Environment</title>
|
|
|
|
<variablelist class='environment-variables'>
|
|
<varlistentry>
|
|
<term><varname>$WATCHDOG_PID</varname></term>
|
|
|
|
<listitem><para>Set by the system manager for supervised
|
|
process for which watchdog support is enabled, and contains
|
|
the PID of that process. See above for
|
|
details.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>$WATCHDOG_USEC</varname></term>
|
|
|
|
<listitem><para>Set by the system manager for supervised
|
|
process for which watchdog support is enabled, and contains
|
|
the watchdog timeout in µs See above for
|
|
details.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>History</title>
|
|
|
|
<para>The watchdog functionality and the
|
|
<varname>$WATCHDOG_USEC</varname> variable were added in
|
|
systemd-41.</para>
|
|
|
|
<para><function>sd_watchdog_enabled()</function> function was
|
|
added in systemd-209. Since that version the
|
|
<varname>$WATCHDOG_PID</varname> variable is also set.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|