CHDIR(2) CHDIR(2)
NAME
chdir, chroot - change working or root directory
SYNOPSIS
int chdir(dirname)
char *dirname;
int chroot(dirname)
char *dirname;
DESCRIPTION
Chdir changes the working directory of the invoking process
to dirname; chroot changes its root directory.
The root directory is the starting point when searching for
pathnames beginning with `/'. The working directory is the
starting point for pathnames that don't. The root directory
normally points to the system root. Login(8) initially sets
the working directory as specified in the password file.
After chroot, it is impossible to name a file outside the
subtree rooted at the current root, provided that the cur-
rent directory is located within the subtree and there are
no links pointing outside the subtree (except for the entry
`..' in the root directory).
Chroot may only be used by the super-user.
SEE ALSO
sh(1), passwd(5)
DIAGNOSTICS
EACCES, EFAULT, EIO, ELOOP, ENOENT, ENOTDIR, EPERM (chroot
only)
BUGS
Using chroot, it is quite easy to fool set-userid programs
about the contents of the password file (for example).