+SKIP: {
+ skip "no fchmod", 5 unless ($Config{d_fchmod} || "") eq "define";
+ ok(open(my $fh, "<", "a"), "open a");
+ is(chmod(0, $fh), 1, "fchmod");
+ $mode = (stat "a")[2];
+ is($mode & 0777, 0, "perm reset");
+ is(chmod($newmode, "a"), 1, "fchmod");
+ $mode = (stat $fh)[2];
+ is($mode & 0777, $newmode, "perm restored");
+}
+
+SKIP: {
+ skip "no fchown", 1 unless ($Config{d_fchown} || "") eq "define";
+ open(my $fh, "<", "a");
+ is(chown(-1, -1, $fh), 1, "fchown");
+}
+
+SKIP: {
+ skip "has fchmod", 1 if ($Config{d_fchmod} || "") eq "define";
+ open(my $fh, "<", "a");
+ eval { chmod(0777, $fh); };
+ like($@, qr/^The fchmod function is unimplemented at/, "fchmod is unimplemented");
+}
+
+SKIP: {
+ skip "has fchown", 1 if ($Config{d_fchown} || "") eq "define";
+ open(my $fh, "<", "a");
+ eval { chown(0, 0, $fh); };
+ like($@, qr/^The fchown function is unimplemented at/, "fchown is unimplemented");
+}
+