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Re: MP3 server with IO::Socket

by ryan (Pilgrim)
on Jan 07, 2002 at 12:13 UTC ( #136797=note: print w/replies, xml ) Need Help??

in reply to MP3 server with IO::Socket

Child reaping update:

After yet more experimentation with this fabulously educational node I did what was necessary to make it run via init.d based on this node.

I soon discovered that when a client was streaming and the parent was killed via the init.d script, the child serving the active client remained running and required manual killing.

To fix this problem I kept track of the children in the code and provided a clean-up routine when the script received a TERM signal. Below I list the $SIG{"TERM"} code to catch the TERM signal and 2 extra lines inside the main while loop to track the children as marked between the # >> tags:

# somewhere before the socket is used my %kids; $SIG{"TERM"} = "cleanup_and_exit"; sub cleanup_and_exit { my $sig = @_; foreach my $kid (keys %kids) { #reap them warn("Failed to reap child pid: $kid\n") unless kill + 9, $kid; } # it's a good idea to exit when we are told to exit(0); } # -- bits left out here -- #wait for connections at the accept call while (my $connection = $listen_socket->accept) { my $child; # perform the fork or exit die "Can't fork: $!" unless defined ($child = fork()); if ($child == 0) { #i'm the child! #close the child's listen socket, we dont need it. $listen_socket->close; #call the main child rountine play_songs($connection); #if the child returns, then just exit; # >> undef $kids{$child}; # >> exit 0; } else { #i'm the parent! # >> $kids{$child} = 1; # >> #who connected? warn "Connecton recieved ... ",$connection->peerhost,"\n"; #close the connection, the parent has already passed # it off to a child. $connection->close(); } #go back and listen for the next connection! } # -- bits left out here --
I'm not a great Perl programmer, but this works flawlessly on my Debian system and has provided my an exceptional motivational tool to start learning socket programming. I hope I havne't overlooked too much error checking or done anything dangerous with my reaping and this can be of some use to someone.

Thanks again.

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