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sub is_FH_a_wrapped_scalar {
    my $FH = shift;
    return grep { $_ eq "scalar} } PerlIO::get_layers($FH);
}

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$ perl pm_1214805.pl
FH is a wrapped scalar, do something else!
...
open $fh, "<", \"/etc/passwd" or die; doit_read $fh;
open $fh, "<",  "/etc/passwd" or die; doit_sysread $fh;
open $fh, "<",  "/etc/passwd" or die; doit_read $fh;