The directory entry is gone, yes. Writing to a file doesn't create directory entries.

I didn't mention glob at all. Did you try the steps I described? The file is only gone once no directory and no file handles reference it. Also, see the post I just made in parallel to yours. 

$ perl -Mv5.10 -e'
   open my $o_fh, ">", "a" or die $!;
   open my $i_fh, "<", "a" or die $!;
   unlink "a" or die $!;
   print $o_fh "abc\n" or die $!;
   $o_fh->flush();
   chomp( my $line = <$i_fh> );
   say "<$line>";
'
<abc>

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In reply to Re^6: Bad file descriptor when trying to close file handle by ikegami
in thread Bad file descriptor when trying to close file handle by fireblood

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