Entering & leaving tty mode

How to take control of ttys for direct braille display / read. More...

Macros
#define	BRLAPI_TTY_DEFAULT   -1

Functions
int BRLAPI_STDCALL	brlapi_enterTtyMode (int tty, const char *driver)
int BRLAPI_STDCALL	brlapi__enterTtyMode (brlapi_handle_t *handle, int tty, const char *driver)
int BRLAPI_STDCALL	brlapi_enterTtyModeWithPath (int *ttys, int count, const char *driver)
int BRLAPI_STDCALL	brlapi__enterTtyModeWithPath (brlapi_handle_t *handle, int *ttys, int count, const char *driver)
int BRLAPI_STDCALL	brlapi_leaveTtyMode (void)
int BRLAPI_STDCALL	brlapi__leaveTtyMode (brlapi_handle_t *handle)
int BRLAPI_STDCALL	brlapi_setFocus (int tty)
int BRLAPI_STDCALL	brlapi__setFocus (brlapi_handle_t *handle, int tty)

Detailed Description

Before being able to write on the braille display, the application must tell the server which tty it will handle.

The application must also specify how braille keys will be delivered to it. Two ways are possible: key codes and commands:

• key codes are specific to each braille driver, since the raw key code, as defined in the driver will be given for each key press. Using them leads to building highly driver-dependent applications, which can yet sometimes be useful to mimic existing proprietary applications for instance.
• commands means that applications will get exactly the same values as brltty. This allows driver-independent clients, which will hopefully be nice to use with a lot of different terminals.

  See Also

  brlapi_readKey()

Macro Definition Documentation

#define BRLAPI_TTY_DEFAULT   -1

Select the default tty.

The library takes the following steps:

1. Try to get the tty number from the WINDOWID environment variable (for the xterm case).
2. Try to get the tty number from the CONTROLVT environment variable.
3. Read /proc/self/stat (on Linux).

See Also

brlapi_enterTtyMode()

Function Documentation

int BRLAPI_STDCALL brlapi__enterTtyMode	(	brlapi_handle_t *	handle,
		int	tty,
		const char *	driver
	)

int BRLAPI_STDCALL brlapi__enterTtyModeWithPath	(	brlapi_handle_t *	handle,
		int *	ttys,
		int	count,
		const char *	driver
	)

int BRLAPI_STDCALL brlapi__leaveTtyMode

(

brlapi_handle_t *

handle

)

int BRLAPI_STDCALL brlapi__setFocus	(	brlapi_handle_t *	handle,
		int	tty
	)

int BRLAPI_STDCALL brlapi_enterTtyMode	(	int	tty,
		const char *	driver
	)

Ask for some tty, with some key mechanism

Parameters

tty	If tty>=0 then take control of the specified tty. If tty==BRLAPI_TTY_DEFAULT then take control of the default tty.
driver	tells how the application wants brlapi_readKey() to return key presses. NULL or "" means BRLTTY commands are required, whereas a driver name means that raw key codes returned by this driver are expected.

WINDOWPATH and WINDOWID should be propagated when running remote applications via ssh, for instance, along with BRLAPI_HOST and the authorization key (see SendEnv in ssh_config(5) and AcceptEnv in sshd_config(5))

Returns

the used tty number on success, -1 on error

See Also

brlapi_leaveTtyMode() brlapi_readKey()

int BRLAPI_STDCALL brlapi_enterTtyModeWithPath	(	int *	ttys,
		int	count,
		const char *	driver
	)

Ask for some tty specified by its path in the tty tree, with some key mechanism

Parameters

ttys	points on the array of ttys representing the tty path to be got. Can be NULL if nttys is 0.
count	gives the number of elements in ttys.
driver	has the same meaning as in brlapi_enterTtyMode()

Providing nttys == 0 means to get the root.

See Also

brlapi_enterTtyMode()

int BRLAPI_STDCALL brlapi_leaveTtyMode

(

void

)

Stop controlling the tty

Returns

0 on success, -1 on error.

See Also

brlapi_enterTtyMode()

int BRLAPI_STDCALL brlapi_setFocus

(

int

tty

)

Tell the current tty to brltty

This is intended for focus tellers, such as brltty, xbrlapi, screen, ... brlapi_enterTtyMode() must have been called beforehand to tell where this focus applies in the tty tree.

Returns

0 on success, -1 on error.

See Also

brlapi_enterTtyMode() brlapi_leaveTtyMode()