In order to avoid the wrong caller package issue, you can create a wrapping sub for
open in the caller package and jump there using
goto &$sub which overwrites the current stack frame. Something similar to the following code:
package MyOpen;
use Carp ();
use Data::Dumper;
use 5.010;
my %cache;
BEGIN {
*CORE::GLOBAL::open = sub {
my $pkg = caller;
my $sub = $cache{$pkg} //= do {
my $code = <<EOS;
package $pkg;
sub {
my \$r = CORE::open \$_[0], \@_[1..\$#_];
Carp::cluck(Data::Dumper::Dumper(\@_));
return \$r;
}
EOS
eval $code or die "Bad sub: $@";
};
goto &$sub;
};
}
package main;
open $fh, '>&', 'STDOUT';
open FOO, ">", "/tmp/FOO";