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Diffstat (limited to 'man/sd_watchdog_enabled.xml')
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diff --git a/man/sd_watchdog_enabled.xml b/man/sd_watchdog_enabled.xml deleted file mode 100644 index 991431f33..000000000 --- a/man/sd_watchdog_enabled.xml +++ /dev/null @@ -1,175 +0,0 @@ -<?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 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> |