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.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 2017 On-Line Applications Research Corporation (OAR)
Device Control
##############
Introduction
============
The POSIX Device Control API is defined by POSIX 1003.26 and attempts
to provides a portable alternative to the ioctl() service which is
not standardized across POSIX implementations. Support for this
standard is required by the Open Group's FACE Technical Standard
:cits:"FACE:2012:FTS". Unfortunately, this part of the POSIX standard
is not widely implemented.
The services provided by the timer manager are:
- posix_devctl_ - Control a Device
Background
==========
Operations
==========
System Calls
============
This section details the POSIX device control's services. A subsection
is dedicated to each of this manager's services and describes the calling
sequence, related constants, usage, and status codes.
.. COMMENT: posix_devctl
.. _posix_devctl
posix_devctl - Control a Device
-------------------------------
**CALLING SEQUENCE:**
.. code-block:: c
#include <devctl.h>
int posix_devctl(
int fd,
int dcmd,
void *restrict dev_data_ptr,
size_t nbyte,
int *restrict dev_info_ptr
);
**STATUS CODES:**
The status codes returned reflect those returned by the ``ioctl()`` service
and the underlying device drivers.
**DESCRIPTION:**
This method is intended to be a portable alternative to the ``ioctl()``
method. The RTEMS implementation follows what is referred to as a library
implementation which is a simple wrapper for the ``ioctl()`` method.
The fd, fcmd, dev_data_ptr, and nbyte parameters are passed unmodified
to the ``ioctl()`` method.
If the dev_info_ptr parameter is not NULL, then the location pointed
to by dev_info_ptr is set to 0.
**NOTES:**
NONE
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