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

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



NAME
     chown - change owner and group of a file

SYNOPSIS
     chown(path, owner, group)
     char *path;
     int owner, group;

     fchown(fd, owner, group)
     int fd, owner, group;

DESCRIPTION
     The file that is named by _p_a_t_h or referenced by _f_d has its
     _o_w_n_e_r and _g_r_o_u_p changed as specified.  Only the super-user
     may change the owner of the file, because if users were able
     to give files away, they could defeat the file-space
     accounting procedures.  The owner of the file may change the
     group to a group of which he is a member.

     On some systems, _c_h_o_w_n clears the set-user-id and set-
     group-id bits on the file to prevent accidental creation of
     set-user-id and set-group-id programs.

     _F_c_h_o_w_n is particularly useful when used in conjunction with
     the file locking primitives (see _f_l_o_c_k(2)).

     One of the owner or group id's may be left unchanged by
     specifying it as -1.

     If the final component of _p_a_t_h is a symbolic link, the own-
     ership and group of the symbolic link is changed, not the
     ownership and group of the file or directory to which it
     points.

RETURN VALUE
     Zero is returned if the operation was successful; -1 is
     returned if an error occurs, with a more specific error code
     being placed in the global variable _e_r_r_n_o.

ERRORS
     _C_h_o_w_n will fail and the file will be unchanged if:

     [ENOTDIR]      A component of the path prefix is not a
                    directory.

     [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.




Printed 12/27/86          May 22, 1986                          1






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



     [ENOENT]       The named file does not exist.

     [EACCES]       Search permission is denied for a component
                    of the path prefix.

     [ELOOP]        Too many symbolic links were encountered in
                    translating the pathname.

     [EPERM]        The effective user ID is not the super-user.

     [EROFS]        The named file resides on a read-only file
                    system.

     [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.

     _F_c_h_o_w_n will fail if:

     [EBADF]        _F_d does not refer to a valid descriptor.

     [EINVAL]       _F_d refers to a socket, not a file.

     [EPERM]        The effective user ID is not the super-user.

     [EROFS]        The named file resides on a read-only file
                    system.

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

SEE ALSO
     chown(8), chgrp(1), chmod(2), flock(2)




















Printed 12/27/86          May 22, 1986                          2