dd_ioctl LFT Device Driver Interface

Purpose

Performs device-dependent processing.

Syntax

int dd_ioctl (DevNo, Cmd, Arg, DevFlag, Chan, Ext) dev_t DevNo; long Cmd, Arg, DevFlag, Chan, Ext;

Description

The dd_ioctl low function terminal (LFT) device driver interface performs device-dependent processing not related to reading from and writing to the device.

Parameters

Item	Description
DevNo	Specifies the major and minor device numbers.
Cmd	Specifies the device-dependent command.
Arg	Specifies the command-dependent parameter block address.
DevFlag	Specifies the flag indicating the type of operation.
Chan	Specifies the channel number (multiplexed devices only).
Ext	Specifies the extension parameter for device-dependent functions.

Return Values

If successful, the dd_ioctl device driver interface returns a value of 0. Otherwise, a value of 1 is returned and the errno global variable is set to indicate the error.