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POWhat's the right way to kill child processes in perl before exiting?
 

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    <p>I'm running an IRC Bot (<a href="http://search.cpan.org/perldoc/Bot::BasicBot#forkit" rel="noreferrer">Bot::BasicBot</a>) which has two child processes running <a href="http://search.cpan.org/perldoc/File::Tail" rel="noreferrer">File::Tail</a> but when exiting, they don't terminate. So I'm killling them using <a href="http://search.cpan.org/perldoc/Proc::ProcessTable" rel="noreferrer">Proc::ProcessTable</a> like this before exiting:</p> <pre><code>my $parent=$$; my $proc_table=Proc::ProcessTable-&gt;new(); for my $proc (@{$proc_table-&gt;table()}) { kill(15, $proc-&gt;pid) if ($proc-&gt;ppid == $parent); } </code></pre> <p>It works but I get this warning:</p> <pre> 14045: !!! Child process PID:14047 reaped: 14045: !!! Child process PID:14048 reaped: 14045: !!! Your program may not be using sig_child() to reap processes. 14045: !!! In extreme cases, your program can force a system reboot 14045: !!! if this resource leakage is not corrected. </pre> <p>What else can I do to kill child processes? The forked process is created using the <a href="http://search.cpan.org/perldoc/Bot::BasicBot#forkit" rel="noreferrer">forkit</a> method in <a href="http://search.cpan.org/perldoc/Bot::BasicBot" rel="noreferrer">Bot::BasicBot</a>.</p> <p>Sample script:</p> <pre><code>package main; my $bot = SOMEBOT-&gt;new ( server =&gt; 'irc.dal.net', channels =&gt; ['#anemptychannel'] ); $SIG{'INT'} = 'Handler'; $SIG{'TERM'} = 'Handler'; sub Handler { $bot-&gt;_stop('Leaving.'); } $bot-&gt;run; package SOMEBOT; use base qw(Bot::BasicBot); use File::Tail; use Proc::ProcessTable; sub irc_error_state { die if $_[10] =~ /Leaving\./; } sub help { return; } sub stop_state { my $parent=$$; my $proc_table=Proc::ProcessTable-&gt;new(); for my $proc (@{$proc_table-&gt;table()}) { kill(15, $proc-&gt;pid) if ($proc-&gt;ppid == $parent); } die; } sub connected { my $self = shift; $self-&gt;forkit ( run =&gt; \&amp;announcer, body =&gt; '/home/somebody/somefile.txt', channel =&gt; '#anemptychannel', ) unless $self-&gt;{log1}; $self-&gt;{log1} = 1; $self-&gt;forkit ( run =&gt; \&amp;announcer, body =&gt; '/home/somebody/anotherfile.txt', channel =&gt; '#anemptychannel', ) unless $self-&gt;{log2}; $self-&gt;{log2} = 1; } sub announcer { my $announcefile = shift; my $file=File::Tail-&gt;new(name =&gt; $announcefile, maxinterval=&gt;5, adjustafter=&gt;7); while (defined(my $line=$file-&gt;read)) { chomp $line; print "$line\n"; } } </code></pre>
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    1. COHi, there is no problem with how you are killing the child processes. The warning is just saying that you have not registered a POE callback for when these processes die - you need to register them with POE->kernel->sig_child(). See: http://kobesearch.cpan.org/htdocs/POE/POE/Kernel.html#sig_child_PROCESS_ID_EVENT_NAME
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