UMOUNT(2-SysV)      RISC/os Reference Manual       UMOUNT(2-SysV)



NAME
     umount - unmount a file system

SYNOPSIS
     int umount (file)
     char *file;

DESCRIPTION
     umount requests that a previously mounted file system con-
     tained on the block special device or directory identified
     by file be unmounted.  file is a pointer to a path name.
     After unmounting the file system, the directory upon which
     the file system was mounted reverts to its ordinary
     interpretation.

     umount may be invoked only by the super-user.

ERRORS
     umount will fail if one or more of the following are true:

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

     [EINVAL]            file does not exist.

     [ENOTBLK]           file is not a block special device.

     [EINVAL]            file is not mounted.

     [EBUSY]             A file on file is busy.

     [EFAULT]            file points to an illegal address.

     [EREMOTE]           file is remote.

     [ENOLINK]           file is on a remote machine, and the
                         link to that machine is no longer
                         active.

     [EMULTIHOP]         Components of the path pointed to by
                         file require hopping to multiple remote
                         machines.

SEE ALSO
     mount(2).

DIAGNOSTICS
     Upon successful completion a value of 0 is returned.  Other-
     wise, a value of -1 is returned and errno is set to indicate
     the error.





                         Printed 1/15/91                   Page 1