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

NAME
     mount, umount - mount or remove file system

SYNOPSIS
     mount(special, name, rwflag)
     char *special, *name;

     umount(special)
     char *special;

DESCRIPTION
     _M_o_u_n_t announces to the system that a removable file system
     has been mounted on the block-structured special file _s_p_e_-
     _c_i_a_l; from now on, references to file _n_a_m_e will refer to the
     root file on the newly mounted file system.  _S_p_e_c_i_a_l and
     _n_a_m_e are pointers to null-terminated strings containing the
     appropriate path names.

     _N_a_m_e must exist already. _N_a_m_e must be a directory (unless
     the root of the mounted file system is not a directory).
     Its old contents are inaccessible while the file system is
     mounted.

     The _r_w_f_l_a_g argument determines whether the file system can
     be written on; if it is 0 writing is allowed, if non-zero no
     writing is done.  Physically write-protected and magnetic
     tape file systems must be mounted read-only or errors will
     occur when access times are updated, whether or not any
     explicit write is attempted.

     _U_m_o_u_n_t announces to the system that the _s_p_e_c_i_a_l file is no
     longer to contain a removable file system.  The associated
     file reverts to its ordinary interpretation.

ERRORS
     _M_o_u_n_t will fail if:

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

     [ENODEV]            _S_p_e_c_i_a_l does not exist.

     [ENOTBLK]           _S_p_e_c_i_a_l is not a block device.

     [ENXIO]             The major device number of _s_p_e_c_i_a_l is
                         out of range (this indicates no device
                         driver exists for the associated
                         hardware).

     [EINVAL]            The path name _n_a_m_e contains a non-ASCII
                         byte.

Printed 5/23/83                                                 1

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

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

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

     [EBUSY]             _N_a_m_e is not a directory or another pro-
                         cess currently holds a reference to it.

     [EBUSY]             No space remains in the mount table.

     _U_m_o_u_n_t may fail with one of the following errors:

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

     [ENODEV]            _S_p_e_c_i_a_l does not exist.

     [ENOTBLK]           _S_p_e_c_i_a_l is not a block device.

     [ENXIO]             The major device number of _s_p_e_c_i_a_l is
                         out of range (this indicates no device
                         driver exists for the associated
                         hardware).

     [EINVAL]            The requested device is not in the mount
                         table.

     [EBUSY]             A process is holding a reference to a
                         file located on the file system.

SEE ALSO
     mount(8)

ASSEMBLER
     (mount = 21.)
     sys mount; special; name; rwflag

     (umount = 22.)
     sys umount; special

Printed 5/23/83                                                 2