TTY

TTY device driver. More...

Functions
devcall	ttyClose (device *devptr)
devcall	ttyControl (device *devptr, int func, long arg1, long arg2)
devcall	ttyGetc (device *devptr)
devcall	ttyInit (device *devptr)
devcall	ttyOpen (device *devptr, va_list ap)
devcall	ttyPutc (device *devptr, char ch)
devcall	ttyRead (device *devptr, void *buf, uint len)
devcall	ttyWrite (device *devptr, void *buf, uint len)

Detailed Description

TTY device driver.

This is the TTY device driver. It is responsible for wrapping around a raw character input/output device to provide line-editing and other useful features.

Function Documentation

devcall ttyClose

(

device *

devptr

)

Close a TTY device.

Parameters

devptr

TTY device table entry

Returns

OK if TTY is closed properly, otherwise SYSERR

devcall ttyControl	(	device *	devptr,
		int	func,
		long	arg1,
		long	arg2
	)

Control function for TTY pseudo devices.

Parameters

devptr	TTY device table entry
func	control function to execute
arg1	first argument for the control function
arg2	second argument for the control function

Returns

the result of the control function

devcall ttyGetc

(

device *

devptr

)

Read a single character from a TTY.

Parameters

devptr

TTY device table entry

Returns

character read from TTY, or EOF

devcall ttyInit

(

device *

devptr

)

Initialize TTY structures.

Parameters

devptr

TTY device table entry

Returns

OK if device is initialized

devcall ttyOpen	(	device *	devptr,
		va_list	ap
	)

Associate a TTY with a hardware device.

Parameters

devptr	TTY device table entry
ap	2nd argument is the device number for the hardware device

Returns

OK if TTY is opened properly, otherwise SYSERR

devcall ttyPutc	(	device *	devptr,
		char	ch
	)

Write a single character to a TTY.

Parameters

devptr	TTY device table entry
ch	character to output

Returns

OK if character was written successfully, otherwise SYSERR

devcall ttyRead	(	device *	devptr,
		void *	buf,
		uint	len
	)

Read characters from a tty.

Parameters

devptr	pointer to tty device
buf	buffer for read characters
len	size of the buffer

Returns

number of characters read, EOF if end of file was reached

devcall ttyWrite	(	device *	devptr,
		void *	buf,
		uint	len
	)

Write a buffer to a tty

Parameters

devptr	TTY device table entry
buf	buffer of characters to output
len	size of the buffer

Returns

count of characters output