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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  beginning  with  /.   The  root
       directory is inherited by all children of the current process.

       Only   a   privileged  process  (Linux:  one  with  the  CAP_SYS_CHROOT
       capability) may call chroot(2).

       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
       descriptors 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(2).)

       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.

       EPERM  The caller has insufficient privilege.

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.

NOTES

       FreeBSD has a stronger jail() system call.

SEE ALSO

       chdir(2), path_resolution(2)