mirror of
https://git.rtems.org/rtems-docs/
synced 2025-05-15 01:46:42 +08:00
76 lines
1.8 KiB
ReStructuredText
76 lines
1.8 KiB
ReStructuredText
.. comment SPDX-License-Identifier: CC-BY-SA-4.0
|
|
|
|
.. COMMENT: COPYRIGHT(c) 2017.
|
|
.. COMMENT: On-Line Applications Research Corporation(OAR).
|
|
.. COMMENT: All rights reserved.
|
|
|
|
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
|