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<div id="projectname">AudioManager
 <span id="projectnumber">7.6.6</span>
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<div id="projectbrief">Native Application Runtime Environment</div>
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<div class="title">The watchdog </div> </div>
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<div class="textblock"><h1><a class="anchor" id="watchdconcept"></a>
The watchdog concept</h1>
<p>The watchdog concept of the audiomanger is based on systemd. When systemd is configured via the unit file to use a watchdog and watchdog support is activated in the audiomanager, the audiomanager will reset the watchdog via the mainloop in the given interval to prevent systemd from restarting the audiomanager.<br />
If the audiomanager is stuck for whatever reason, systemd will not get this update and restart the audiomanager.</p>
<h1><a class="anchor" id="configwatch"></a>
Watchdog configuration</h1>
<p>By default, the watchdog is enabled in the audiomanager, you can disable the watchdog functionality by setting the cmake build option "WITH_SYSTEMD_WATCHDOG" to OFF, either by modifying the cmake cache with ccache or by passing -DWITH_SYSTEMD_WATCHDOG=OFF to cmake.<br />
The interval for checking the watchdog can be set in the unitfile of systemd by setting "WatchdogSec". The other settings need to be done as well: </p><div class="fragment"><div class="line">Restart=always</div><div class="line">WatchdogSec=2</div><div class="line">NotifyAccess=<a class="code" href="main_8cpp.html#af9f20e08914b990ce83431d5dc6df07b">main</a></div></div><!-- fragment --><p> The intervall for pinging systemd is set to the half of "WatchdogSec".</p>
<h1><a class="anchor" id="winteg"></a>
Integration with systemd</h1>
<p>The audiomanager will use the library proviced by "libsystemd-daemon" if it is available on the system. If this library is not available, the files sd-daemon.c and sd-daemon.h that are provided with the audiomanager and released under MIT licence by Lennard Poettering will be used to connect to systemd.</p>
<p>more information can be found here: <a class="el" href="classam_1_1CAmWatchdog.html" title="Implements the watchdog of the AudioManager with the help of systemd. ">am::CAmWatchdog</a> and sd-daemon.h . </p>
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