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<p align="center" style="text-align: center;"><font face="Courier New,Courier,mono" color="#FED801" size="+1"><b>Jugendzentrum Kirchheim - Technik</b></font><br /><img src="dot_red.gif" width="600"height="1" alt="-------------------------------------------------------" /><br /><font face="Courier New,Courier, mono"><b>daemon.pm</b></font></p>
<P>Simple Perl-Object to create daemons under Linux (and perhaps other
Unix-like systems). The module detaches the process and makes sure that
no more output is sent to the console. If you want to quit the daemon, you
can use the kill function which will send the daemon a QUIT signal, causing
it to quit properly.</P>
<P>A simple logging interface is provided, as well as a function to test whether
the daemon is running (this function uses the the PID file).</P>
<h2 align="center"><a name="examples"></a>Example daemons</h2>
<P>We provide two examples for our daemon object, that should show the functionning
principles for two main usages of backgroud processes:</P>
<P><B>Timer-controlled daemon</B><BR></BR>
This program is a backgroud process that uses a timer to take regular
actions. Such an action could be writing an entry to a log file or checking
wheather there are new files in a directory. In place of a timer we abuse
the select function (which is usually needed for non-blocking IO; we have
to use it as it is the only portable way to have a timer which supports
times shorter than a second).</P>
<P><B>Server daemon</B><BR></BR>
A small server program that prints out the local time to all clients that
connect to its listening address. The daemon sleeps while there is no
change on the listening socket (blocking IO).</P>
<h1>Downloads</h1><ul>
<li><a class="tag_dllink_intern" href="/projects/files/Perl-Modules/daemon/daemon-1.0.1.pm" target="_blank">daemon.pm (version 1.0.1)</a></li>
<li><a class="tag_dllink_intern" href="/projects/files/Perl-Modules/daemon/timer-daemon-1.0.1.pl" target="_blank">timer-daemon.pl
(version 1.0.1)</a></li>
<li><a class="tag_dllink_intern" href="/projects/files/Perl-Modules/daemon/server-daemon-1.0.1.pl" target="_blank">server-daemon.pl
(version 1.0.1)</a></li>
</ul>
<h1>Documentation</h1>
<P>The first step is usually to decide which kind of daemon you wish to
write. Then you should have a look at a sample program (something like
the two scripts you can download above). If you need a reference for the
functions, have a look at the documentation contained inb the module:</P>
<ul>
<li><a class="tag_dllink_intern" href="/projects/files/Perl-Modules/daemon/daemon-1.0.1.html" target="_blank">POD-Documentation
for daemon.pm(opens in a new window!)</a></li></ul>
<p align="right" class="tag_author"><font size="-1" class="tag_author"><i>
bc
</i><br />last update: 11.12.2005 23:22</font></p>
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