4.3BSD-UWisc/man/cat2/chroot.2

CHROOT(2)           UNIX Programmer's Manual            CHROOT(2)



NAME
     chroot - change root directory

SYNOPSIS
     chroot(dirname)
     char *dirname;

DESCRIPTION
     _D_i_r_n_a_m_e is the address of the pathname of a directory, ter-
     minated by a null byte.  _C_h_r_o_o_t 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 _e_r_r_n_o is set to indi-
     cate an error.

ERRORS
     _C_h_r_o_o_t 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.

     [EINVAL]       The pathname contains a character with the
                    high-order bit set.

     [ENAMETOOLONG] A component of a pathname exceeded 255 char-
                    acters, or an entire path name exceeded 1023
                    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.

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

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





Printed 12/27/86         August 26, 1985                        1






CHROOT(2)           UNIX Programmer's Manual            CHROOT(2)



SEE ALSO
     chdir(2)





















































Printed 12/27/86         August 26, 1985                        2