clone man page on DigitalUNIX

clone man page on DigitalUNIX

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clone(7)							      clone(7)

NAME
       clone - Opens a major and minor device pair on a STREAMS driver

DESCRIPTION
       The  clone  driver  is a "pass through" device driver that allows other
       drivers to select unique minor device numbers on each open. In  effect,
       the  driver  passes an open operation through to the other driver. This
       mechanism allows for multiple instantiations of a driver through a sin‐
       gle file system node.

       The  name  parameter specifies the name of the special device driver to
       be opened. The clone driver calls the open routine of the other	driver
       with flags that specify a clone open, and sets up the new instantiation
       using the returned major/minor pair. The new major number is the	 minor
       number of the clonable entry, and the minor number has been dynamically
       selected.

       If the clone driver has an invalid minor number, or if the driver indi‐
       cated is not a clonable driver, an error occurs.

       The master devices for pseudoterminals are examples of clonable drivers
       (see the pty(7) reference page).

SEE ALSO
       Functions: fstat(2), open(2)

       Interfaces: pty(7)

								      clone(7)

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