umount(2)                                               umount(2)



     NAME
          umount - unmount a file system

     SYNOPSIS
          int umount (spec)
          char *spec;

     DESCRIPTION
          umount requests that a previously mounted file system
          contained on the block special device identified by spec be
          unmounted.  spec 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.

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

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

          [ENXIO]        spec does not exist.

          [ENOTBLK]      spec is not a block special device.

          [EINVAL]       spec is not mounted.

          [EBUSY]        A file on spec is busy.

          [EFAULT]       spec points to an illegal address.

     RETURN VALUE
          Upon successful completion a value of 0 is returned.
          Otherwise, a value of -1 is returned and errno is set to
          indicate the error.

     SEE ALSO
          mount(2).
















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