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Writing Device Drivers for Oracle® Solaris 11.3

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Updated: March 2019

Overview of the Character Driver Structure

    Character Driver Roadmap shows data structures and routines that define the structure of a character device driver. Device drivers typically include the following elements:

  • Device-loadable driver section

  • Device configuration section

  • Character driver entry points

The shaded device access section in the following figure illustrates character driver entry points.

Figure 13  Character Driver Roadmap

image:Diagram shows structures and entry points for character device drivers.

Associated with each device driver is a dev_ops(9S) structure, which in turn refers to a cb_ops(9S) structure. These structures contain pointers to the driver entry points:

Note - Some of these entry points can be replaced with nodev(9F) or nulldev(9F) as appropriate.