Try writing nothing at all to the file, and see if it fails:
return print $fh '';
or die "Couldn't open '$0' for read: $!\n";
print "F1 is".(is_writable_fh(\*F1)?"":"n't")." writable.\n";
or die "Couldn't open '$0' for append: $!\n";
print "F2 is".(is_writable_fh(\*F2)?"":"n't")." writable.\n";
Zaxo's solution will tell you whether you have write permissions to the file, but not whether you have write permissions to the filehandle.
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