NAME

     chroot - change root directory


SYNOPSIS

     #include <unistd.h>

     int chroot(const char *dirname)


DESCRIPTION

     Dirname is the address of the pathname of a directory,  ter-
     minated  by  a  null  byte.  Chroot causes this directory to
     become the root directory, the starting point for path names
     beginning with ``/''.

     In order for a directory to become the root directory a pro-
     cess must have execute (search) access to the directory.

     This call is restricted to the super-user.


RETURN VALUE

     Upon successful completion, a value of 0 is returned.   Oth-
     erwise,  a value of -1 is returned and errno is set to indi-
     cate an error.


ERRORS

     Chroot will fail and the root directory will be unchanged if
     one or more of the following are true:

     [ENOTDIR]      A component of the path name is not a  direc-
                    tory.

     [ENAMETOOLONG] The path name exceeds PATH_MAX characters.

     [ENOENT]       The named directory does not exist.

     [EACCES]       Search permission is denied for any component
                    of the path name.

     [ELOOP]        Too many symbolic links were  encountered  in
                    translating the pathname.  (Minix-vmd)

     [EFAULT]       Path points outside the  process's  allocated
                    address space.

     [EIO]          An I/O error occurred while reading  from  or
                    writing to the file system.


SEE ALSO

     chdir(2).