chroot

SYNOPSIS
       #include <unistd.h>

       int chroot(const char *path);

DESCRIPTION
       chroot()  changes  the  root  directory  of the calling process to that
       specified in path.  This directory will be used for pathnames beginning
       with /.  The root directory is inherited by all children of the calling
       process.

       Only a privileged process (Linux: one with the CAP_SYS_CHROOT  capabil-
       ity) may call chroot().

       This  call changes an ingredient in the pathname resolution process and
       does nothing else.

       This call does not change the current working directory, so that  after
       the call '.' can be outside the tree rooted at '/'.  In particular, the
       superuser can escape from a "chroot jail" by doing:

           mkdir foo; chroot foo; cd ..

       This call does not close open file descriptors, and such file  descrip-
       tors may allow access to files outside the chroot tree.

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:

       EACCES Search  permission  is denied on a component of the path prefix.
              (See also path_resolution(7).)

       EFAULT path points outside your accessible address space.

       EIO    An I/O error occurred.

       ELOOP  Too many symbolic links were encountered in resolving path.

       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.

SEE ALSO
       chdir(2), path_resolution(7)

COLOPHON
       This page is part of release 3.23 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-06-23                         CHROOT(2)