Programming Perl, 4th Edition

chroot

chroot FILENAME
chroot

If successful, FILENAME becomes the new root directory for the current process—the starting point for pathnames beginning with “/”. This directory is inherited across exec calls and by all subprocesses forked after the chroot call. There is no way to undo a chroot. For security reasons, only the superuser can use this function. Here’s some code that approximates what many FTP servers do:

chroot((getpwnam("ftp"))[7])
    || die "can't do anonymous ftp: $!";

This function is unlikely to work on non-Unix systems. See chroot(2).