datahub

datahub -- starts the Cascade DataHub.

Synopsis

datahub [-aDhstvVX] [-b size] [-d domain] [-q queue]

Arguments

-a

Re-transmit all point messages to all registered clients, even if the value did not change.

-b size

The maximum message buffer size.

-d domain

The domain name for this datahub.

-D

Do not detach from the controlling tty. Normally the datahub will detach itself and become immune to interrupts and termination on the controlling tty. If this option is used, then the & is necessary to run datahub in the background.

-h

Print a help message showing a summary of all these arguments.

-q queue

Specify an alternate queue name for this datahub. Normally datahub chooses its own queue name to be unique on the network.

-s

Synchronized: The datahub will ignore changes to a point if the point's current timestamp is more recent.

-t

Automatically generate a timestamp on unstamped points.

-v

Generate copious debugging information to the standard output. (Implies use of -n).

-V

Print the version number.

-X

Exit immediately (usually used with -V).

Returns

On success, nothing; on error, a message.

Description

The datahub utility is the Cascade DataHub (datahub). The datahub does not use a configuration file since it is configured by its clients while running.

Dependencies

qserve, nserve

See Also

Running the Cascade DataHub, dhview, phdhview, xdhview

Example

    [sh]$  datahub

Starts the datahub in the domain default.

    [sh]$  datahub -d control

Starts the datahub in the domain control.

Copyright 1995-2002 by Cogent Real-Time Systems, Inc.