I try to rewrite the code with old style without callback. according to the win32::daemon document, this kind of style is obsolete and we should use callback.

but the old style won't leak memory. code below. I named the service "memory-noleak".

#!/usr/bin/perl
use strict;
use warnings;
use Win32::Daemon;
use Getopt::Long;

my @cmd = @ARGV;
my ($opt_g,$opt_h,$opt_i,$opt_r);
if (! GetOptions('g=s' =>\$opt_g, 'h' => \$opt_h, 'i' => \$opt_i, 'r' 
+=>\$opt_r)){
        print "command line wrong !!!\n";
        exit(1);
}

if ($opt_h or ! @cmd){
        print <<EOF;
Usage: memory-noleak [options]
  test perl service memory-noleak
      -i        install memory-noleak Service
    -r        remove memory-noleak Service
        -h              help message
    -g        (internal use only)
EOF
        exit(0);
}

# get program name
our $fn = Win32::GetFullPathName($0);
our ($cwd,$bn,$ext) = ($fn =~ /^(.*\\)(.*)\.(.*)$/ )[0..2];

if ($opt_i){
    # install service
    # Determine service's path to executable based on file extension
    my ($path,$parameters);
    if ($ext eq "pl"){
        # Source perl script - invoke perl interpreter
        $path = "\"$^X\"";
        # The command includes the -g go switch needed to enter servic
+e mode
        $parameters = "\"$fn\" -g go";
       }elsif ($ext eq "exe"){
              # Compiled perl script - invoke the compiled script
        $path = "\"$fn\"";
        $parameters = "-g go";
    }else{
        # Invalid file type?
        print "Can not install service for $fn,file extension $ext not
+ supported\n";
        exit(1);
    }

    # Populate the service configuration hash
    my %srv_config = (
        name        => "memory-noleak",
        display        => "memory-noleak",
        path        => $path,
        description    => "memory-noleak",
        parameters    => $parameters,
        service_type    => SERVICE_WIN32_OWN_PROCESS,
        start_type    => SERVICE_AUTO_START
    );

    # Install the service
    if (Win32::Daemon::CreateService(\%srv_config)){
        print "memory-noleak Service installed successfully\n";
    }else{
        print "Failed to install service: $!\n";
        exit(1);
    }
}elsif ($opt_r){
    # remove service
    if (Win32::Daemon::DeleteService("memory-noleak")){
        print "memory-noleak Service uninstalled successfully\n";
    }else{
        print "Failed to uninstall service: $!\n";
        exit(1);
    }
}elsif ($opt_g eq "go"){
  my $SERVICE_SLEEP_TIME = 30;
  my $PrevState = SERVICE_START_PENDING;
  Win32::Daemon::StartService();
  while( SERVICE_STOPPED != ( my $State = Win32::Daemon::State())){
    if( SERVICE_START_PENDING == $State ){
        # Initialization code
            Win32::Daemon::State( SERVICE_RUNNING );
            $PrevState = SERVICE_RUNNING;
    }elsif( SERVICE_STOP_PENDING == $State ){
      # "Stopping...";
      Win32::Daemon::State( SERVICE_STOPPED );
      $PrevState = SERVICE_STOPPED;
      next;
    }elsif( SERVICE_RUNNING == $State ){
    }else{
      Win32::Daemon::State( $PrevState );
    }
    Win32::Sleep( $SERVICE_SLEEP_TIME );
  }
  Win32::Daemon::StopService();
exit(0);
}
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