Be wary about duping filehandles using fileno. It doesn't copy existing PerlIO layers:
use warnings;
use strict;

use IO::Handle;

use Data::Dumper;
local $Data::Dumper::Terse = 1;
local $Data::Dumper::Indent = 0;

binmode *STDIN, ":encoding(UTF-8)";

my $FH_fileno = IO::Handle->new;
$FH_fileno->fdopen(fileno(STDIN), "r") or die $!;

my $FH = IO::Handle->new;
$FH->fdopen(*STDIN, "r") or die $!;

print "*STDIN = ", Dumper([ PerlIO::get_layers(*STDIN) ]), "\n";
print "fdopen fileno = ", Dumper([ PerlIO::get_layers($FH_fileno) ]), 
+"\n";
print "fdopen STDIN  = ", Dumper([ PerlIO::get_layers($FH) ]), "\n";

__END__

*STDIN = ['unix','perlio','encoding(utf-8-strict)','utf8']
fdopen fileno = ['unix','perlio']
fdopen STDIN  = ['unix','perlio','encoding(utf-8-strict)','utf8']

[download]

In reply to Re: Filehandle dilemma (DATA, STDIN, a file) by repellent
in thread Filehandle dilemma (DATA, STDIN, a file) by roboticus

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