CHROOT(T)           Linux Programmer's Manual           CHROOT(T)



NAME
       chroot - change root directory

SYNOPSIS
       #include <unistd.h>

       int chroot(const char *path);

DESCRIPTION
       chroot  changes  the  root  directory to that specified in
       path.  This directory will be used for path  names  begin-
       ning with /.  The root directory is inherited by all chil-
       dren of the current process.

       Only the super-user may change the root directory.

       Note that this call does not change  the  current  working
       directory,  so  that `.' can be outside the tree rooted at
       `/'.  In particular, the  super-user  can  escape  from  a
       `chroot jail' by doing `mkdir foo; chroot foo; cd ..'.

RETURN VALUE
       On  success,  zero is returned.  On error, -1 is returned,
       and errno is set appropriately.

ERRORS
       Depending  on  the  file  system,  other  errors  can   be
       returned.  The more general errors are listed below:


       EPERM  The effective UID is not zero.

       EFAULT path  points outside your accessible address space.

       ENAMETOOLONG
              path is too long.

       ENOENT The file does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOTDIR
              A component of path is not a directory.

       EACCES Search permission is denied on a component  of  the
              path prefix.

       ELOOP  Too many symbolic links were encountered in resolv-
              ing path.

       EIO    An I/O error occurred.

CONFORMING TO
       SVr4, SVID, 4.4BSD, X/OPEN.  This function is not part  of
       POSIX.1.   SVr4  documents  additional  EINTR, ENOLINK and
       EMULTIHOP error conditions.  X/OPEN does not document EIO,
       ENOMEM  or  EFAULT  error  conditions.   This interface is
       marked as legacy by X/OPEN.

SEE ALSO
       chdir(r)



Linux 2.0.30                1997-08-21                  CHROOT(T)