Dismounts a mounted volume or volume sets.

    Format

      SYS$DISMOU  devnam ,[flags]

    C Prototype

      int sys$dismou  (void *devnam, unsigned int flags);

1  –  Arguments

 devnam

    OpenVMS usage:device_name
    type:         character-coded text string
    access:       read only
    mechanism:    by descriptor-fixed-length string descriptor
    Device name of the device to be dismounted. The devnam argument
    is the address of a character string descriptor pointing to
    the device name string. The string can be either a physical
    device name or a logical name. If it is a logical name, it must
    translate to a physical device name.

 flags

    OpenVMS usage:mask_longword
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    A longword bit vector specifying options for the dismount
    operation. The flags argument is a longword bit vector wherein
    a bit, when set, selects the corresponding option. Each bit has a
    symbolic name; these names are defined by the $DMTDEF macro.

    The flags and their meanings are listed in the following table:

    Flag                Meaning

    DMT$M_ABORT         The volume is to be dismounted even if
                        the caller did not mount the volume. If
                        the volume was mounted with MNT$M_SHARE
                        specified, $DISMOU dismounts the volume for
                        all of the users who mounted it.

                        To specify DMT$M_ABORT, the caller must: (1)
                        have GRPNAM privilege for a group volume,
                        (2)  have SYSNAM privilege for a system
                        volume, or (3)  either own the volume or have
                        VOLPRO privilege.

    DMT$M_CLUSTER       The volume is to be dismounted clusterwide,
                        that is, from all nodes in the OpenVMS
                        Cluster system. $DISMOU dismounts the volume
                        from the caller's node first and then from
                        every other node in the existing cluster.

                        DMT$M_CLUSTER dismounts only system or
                        group volumes. To dismount a group volume
                        clusterwide, the caller must have GRPNAM
                        privilege. To dismount a system volume
                        clusterwide, the caller must have SYSNAM
                        privilege.

                        DMT$M_CLUSTER has no effect if the system
                        is not a member of a cluster. DMT$M_CLUSTER
                        applies only to disks.

    DMT$M_FORCE         If connectivity to a device has been lost and
                        the shadow set is in mount verification, this
                        flag causes a named shadow set member to be
                        immediately expelled from the shadow set.

    DMT$M_MINICOPY_     $DISMOU takes place, regardless of whether
    OPTIONAL            minicopy is enabled on the disk.

    DMT$M_MINICOPY_     $DISMOU fails if minicopy has not been
    REQUIRED            enabled on the disk.

    DMT$M_NOUNLOAD      Specifies that the volume is not to be
                        physically unloaded after the dismount. If
                        both the DMT$M_UNLOAD and DMT$M_NOUNLOAD
                        flags are specified, the DMT$M_NOUNLOAD flag
                        is ignored. If neither flag is specified,
                        the volume is physically unloaded, unless
                        the DMT$M_NOUNLOAD flag was specified on
                        the $MOUNT system service or the /NOUNLOAD
                        qualifier was specified on the MOUNT command
                        when the volume was mounted.

    DMT$M_OVR_CHECKS    Specifies that the volume should be
                        dismounted without checking for open files,
                        spooled devices, installed images, or
                        installed swap and page files.

    DMT$M_UNIT          The specified device, rather than the entire
                        volume set, is dismounted.

    DMT$M_UNLOAD        Specifies that the volume is to be physically
                        unloaded after the dismount. If both the
                        DMT$M_UNLOAD and DMT$M_NOUNLOAD flags
                        are specified, the DMT$M_NOUNLOAD flag
                        is ignored. If neither flag is specified,
                        the volume is physically unloaded, unless
                        the DMT$M_NOUNLOAD flag was specified on
                        the $MOUNT system service or the /NOUNLOAD
                        qualifier was specified on the MOUNT command
                        when the volume was mounted.