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.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
Operations
==========
Register and Lookup Name
------------------------
The ``rtems_io_register`` directive associates a name with the specified device
(i.e. major/minor number pair). Device names are typically registered as part
of the device driver initialization sequence. The ``rtems_io_lookup``
directive is used to determine the major/minor number pair associated with the
specified device name. The use of these directives frees the application from
being dependent on the arbitrary assignment of major numbers in a particular
application. No device naming conventions are dictated by RTEMS.
Accessing an Device Driver
--------------------------
The I/O manager provides directives which enable the application program to
utilize device drivers in a standard manner. There is a direct correlation
between the RTEMS I/O manager directives ``rtems_io_initialize``,
``rtems_io_open``, ``rtems_io_close``, ``rtems_io_read``, ``rtems_io_write``,
and ``rtems_io_control`` and the underlying device driver entry points.
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