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I am running a small TCP daemon that needs to be able to kick-start itself from a client connection. I.e. it is possible for the client to send data that should cause the whole script to restart itself.

I have scavenged around, and grabbed code from some of the nodes down these branches: 131572 and 529604. From those I have managed to replicate my same original problem.

The server

#!/usr/bin/perl use strict; use warnings; use Net::EasyTCP; use constant LOG_DIR => '/tmp'; use constant LOG_FILE => 'daemon.log'; use constant PIDDIR => LOG_DIR; use Proc::PID_File; use Proc::Daemon; use Log::Dispatch; use Log::Dispatch::File; use Date::Format; use File::Spec; sub dienice ($); our $ME = $0; $ME =~ s|.*/||; our $PIDFILE = PIDDIR."/$ME.pid"; startDaemon(); our $HOSTNAME = `hostname`; chomp $HOSTNAME; my $log = new Log::Dispatch( callbacks => sub { my %h=@_; return Date::Format::time2str('%B %e %T', time)." ".$HOSTN +AME." $0\[$$]: ".$h{message}."\n"; } ); $log->add( Log::Dispatch::File->new( name => 'file1', min_level => 'warning', mode => 'append', filename => File::Spec->catfile(LOG_DIR, LOG_FILE), ) ); $log->warning("Starting Processing: ".time() ); my $daemon_path = $0; my $perl_path; open(SOURCE, $daemon_path); <SOURCE> =~ /^#!(\S+)/; $perl_path = $1; close(SOURCE); if (!-x $perl_path) { $perl_path = $^X; } my @daemon_argv = @ARGV; my $server; $server = Net::EasyTCP->new( mode => "server", port => 12345, ) || die "ERROR CREATING SERVER: $@\n"; $server->setcallback( data => \&gotdata, connect => \&connected, disconnect => \&disconnected ) || die "ERROR SETTING CALLBACKS: $@\n"; $log->warning('Server starting...'); $server->start() || die "ERROR STARTING SERVER: $@\n"; $log->warning('Server has stopped - we need to restart!'); &restart_daemon; #--------------------------------------------------------------------- +--------- # sub gotdata #--------------------------------------------------------------------- +--------- sub gotdata { my $client = shift; my $serial = $client->serial(); my $data = $client->data(); $log->warning( "Client sent data: $data" ); if( $data eq "HUP" ){ $server->stop(); $log->warning( 'Server sent HUP by client!' ); } } #--------------------------------------------------------------------- +--------- # sub connected #--------------------------------------------------------------------- +--------- sub connected { my $client = shift; my $serial = $client->serial(); $log->warning( "Client $serial just connected." ); } #--------------------------------------------------------------------- +--------- # sub disconnected #--------------------------------------------------------------------- +--------- sub disconnected { my $client = shift; my $serial = $client->serial(); $log->warning( "Client $serial just disconnected." ); } #--------------------------------------------------------------------- +--------- # sub restart_daemon #--------------------------------------------------------------------- +--------- sub restart_daemon { $log->warning( "RESTART: $perl_path, $daemon_path, @daemon_argv" ); release_the_pid_file(); exec($perl_path, $daemon_path, @daemon_argv) || $log->warning("EXEC +failed: $! $? $@"); die "Failed to restart daemon"; } #--------------------------------------------------------------------- +--------- # sub restart_daemon #--------------------------------------------------------------------- +--------- sub startDaemon { eval { Proc::Daemon::Init; }; dienice("Unable to start daemon: $@") if $@; dienice("Already running!") if hold_pid_file($PIDFILE); } #--------------------------------------------------------------------- +--------- # sub dienice #--------------------------------------------------------------------- +--------- sub dienice ($) { my ($package, $filename, $line) = caller; $log->critical("$_[0] at line $line in $filename"); die $_[0]; } __END__

And the 'hupping' client

#!/usr/bin/perl use strict; use warnings; use Net::EasyTCP; my $host = $ARGV[0] || 'localhost'; my %client = ( mode => "client", host => $host, port => 12345, ); my $client = Net::EasyTCP->new(%client) || die "ERROR CREATING CLIENT: + $@\n"; $client->send('HUP') || die "ERROR SENDING: $@\n"; print "HUP Done\n"; sleep 3; my $client2 = Net::EasyTCP->new(%client) || die "ERROR CREATING CLIENT +2: $@\n"; $client2->send('TEST') || die "ERROR SENDING: $@\n"; print "OK..\n"; my $reply = $client2->receive() || die "ERROR RECEIVING: $@\n"; print "reply: $reply\n"; $client->close(); __END__

Something somewhere is stopping this from restarting itself, and I cannot, for whatever reason, see it:

>perl client_hup.pl HUP Done ERROR CREATING CLIENT2: Could not connect to localhost:12345: Connecti +on refused

EDIT
Server output:

February 14 15:26:21 localhost easy_daemon.pl[32293]: Starting Process +ing: 1203002781 February 14 15:26:21 localhost easy_daemon.pl[32293]: Server starting. +.. February 14 15:32:43 localhost easy_daemon.pl[32293]: Client 1 just co +nnected. February 14 15:32:43 localhost easy_daemon.pl[32293]: Client sent data +: HUP February 14 15:32:43 localhost easy_daemon.pl[32293]: Server sent HUP +by client! February 14 15:32:43 localhost easy_daemon.pl[32293]: Server has stopp +ed - we need to restart! February 14 15:32:43 localhost easy_daemon.pl[32293]: RESTART: /usr/bi +n/perl, easy_daemon.pl,

-=( Graq )=-


In reply to My daemon will not restart by graq

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