open(my $fh, '>', $path) || die $!;
my_sub($fh);
Can my_sub() somehow extrapolate $path from $fh?
A filehandle might not even be connected to a file but instead to a network socket or a pipe hooked to the standard output of a child process.
If you want to associate handles with paths your code opens, use a hash and the fileno
operator, e.g.,
my %fileno2path;
sub myopen {
my($path) = @_;
open my $fh, "<", $path or die "$0: open: $!";
$fileno2path{fileno $fh} = $path;
$fh;
}
sub myclose {
my($fh) = @_;
delete $fileno2path{fileno $fh};
close $fh or warn "$0: close: $!";
}
sub path {
my($fh) = @_;
$fileno2path{fileno $fh};
}