#!perl
use Config;
use File::Basename qw(&basename &dirname);
use Cwd;

$origdir = cwd;
chdir dirname($0);
$file = basename($0, '.PL');
$file .= $^O eq 'VMS' ? '.com' : '.pl';

open OUT,">$file" or die "Can't create $file: $!";

print "Extracting $file (with variable substitutions)\n";

print OUT <<"!GROK!THIS!";
$Config{startperl} -w
!GROK!THIS!

# In the following, perl variables are not expanded during extraction.

print OUT <<'!NO!SUBS!';
# file: urg_recv.pl
# Figure 17.3: A server that processes urgent data

use strict;
use IO::Socket;
use Fcntl;

my $PORT = shift || 2007;
my ($sock,$data);

$SIG{URG} = sub {
  my $r = recv($sock,$data,100,MSG_OOB);
  print $r ? ("got ",length($data)," bytes of urgent data: $data\n")
           : ("recv() error: $!\n");
};

my $listen = IO::Socket::INET->new( Listen    => 15,
                                    LocalPort => $PORT,
                                    Reuse     => 1) or die "Can't listen: $!";
warn "Listening on port $PORT...\n";

$sock = $listen->accept;

# set the owner for the socket so that we get sigURG
fcntl($sock,F_SETOWN,$$) or die "Can't set owner: $!";

# echo the data
while (sysread $sock,$data,1024) {
  print "got ",length($data)," bytes of normal data: $data\n";
}

__END__
!NO!SUBS!
close OUT or die "Can't close $file: $!";
chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';
chdir $origdir;