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Kernel and Subsystems Technical Reference, Volume 2
KSLED (Illuminate/Darken Keyboard LEDs)
Purpose
Illuminates and darkens LEDs on the keyboard.
Syntax
#include <sys/inputdd.h>
int ioctl (FileDescriptor, KSLED, Arg)
int FileDescriptor, *Arg;
Description
The KSLED ioctl subroutine call illuminates and darkens the LEDs on the natively attached keyboard. The Arg parameter points to a bit mask (one bit per LED) that specifies the state of each keyboard LED.
The current state of the keyboard LEDs is returned in the input ring event report for the keyboard.
When keyboard diagnostics are enabled, the KSLED ioctl operation fails and sets the errno global variable to a value of EBUSY.
Parameters
Arg |
Specifies the address of the LED bit mask. The bit mask can be any combination of the following values ORed together:
#define KSCROLLLOCK |
0x01 |
/*Illuminates ScrollLock LED.*/ |
#define KSNUMLOCK |
0x02 |
/*Illuminates NumLock LED.*/ |
#define KSCAPLOCK |
0x04 |
/*Illuminates CapsLock LED.*/ |
|
FileDescriptor |
Specifies the open file descriptor for the keyboard. |
Implementation Specifics
This ioctl subroutine call is part of Base Operating System (BOS) Runtime.
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