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# If the write handle is a dup give it away entirely, close my copy
# of it.
xclose $dad_wtr if $dup_wtr;

$ perl -MCarp=verbose a.pl
open3: close(4) failed: Bad file descriptor at /usr/share/perl/5.8/IPC
+/Open3.pm line 70
        IPC::Open3::xclose(4) called at /usr/share/perl/5.8/IPC/Open3.
+pm line 218
        IPC::Open3::_open3('open3', 'main', '<&4', '>&STDOUT', '>&STDE
+RR', '/bin/cat') called at /usr/share/perl/5.8/IPC/Open3.pm line 229
        IPC::Open3::open3('<&4', '>&STDOUT', '>&STDERR', '/bin/cat') c
+alled at a.pl line 21

xclose $dad_wtr if $dup_wtr;

if ($dup_wtr) {
    if (fh_is_fd($dad_wtr)) {
...
        xfdclose xfileno($dad_wtr);
    }
}