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SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
brief: |
Controls the device specified by the device major and minor numbers.
copyrights:
- Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
- Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
definition:
default:
attributes: null
body: null
params:
- ${device-major-number:/name} ${.:/params[0]/name}
- ${device-minor-number:/name} ${.:/params[1]/name}
- void *${.:/params[2]/name}
return: ${../../status/if/code:/name}
variants: []
description: |
This directive calls the device driver I/O control entry registered in the
Device Driver Table for the specified device major number.
enabled-by: true
index-entries:
- IO control
- special device services
interface-type: function
links:
- role: interface-placement
uid: header
- role: interface-ingroup
uid: group
- role: constraint
uid: /constraint/directive-not-pre-qualified
name: rtems_io_control
notes: |
The exact functionality of the driver entry called by this directive is
driver dependent. It should not be assumed that the control entries of two
device drivers are compatible. For example, an RS-232 driver I/O control
operation may change the baud of a serial line, while an I/O control
operation for a floppy disk driver may cause a seek operation.
params:
- description: |
is the major number of the device.
dir: null
name: major
- description: |
is the minor number of the device.
dir: null
name: minor
- description: |
is the argument passed to the device driver I/O control entry.
dir: null
name: argument
return:
return: |
Other status codes may be returned by the device driver I/O control
entry.
return-values:
- description: |
The requested operation was successful.
value: ${../../status/if/successful:/name}
- description: |
The device major number was invalid.
value: ${../../status/if/invalid-number:/name}
type: interface
|
