The Cygwin chroot() implementation has holes (it can not restrict file
access by native Win32 programs).
-Inplace editing ( perl -i ) of files doesn't work without doing a backup
-of the file being edited ( perl -i.bak ).
+Inplace editing C<perl -i> of files doesn't work without doing a backup
+of the file being edited C<perl -i.bak> because of windowish restrictions,
+so Perl adds the C<.bak> automatically if you just use C<perl -i>.
=back
=head1 BUGS ON CYGWIN
-When I<make> starts, it warns about overriding commands for F<perlmain.o>.
-
Support for swapping real and effective user and group IDs is incomplete.
On WinNT Cygwin provides setuid(), seteuid(), setgid() and setegid().
However, additional Cygwin calls for manipulating WinNT access tokens