tty_flip_buffer

tty_flip_buffer

[V. Ananda Krishnan]

Hi,

In the new tty_buffer structure, flag_buf_ptr is used in addition to the 
char_buf_ptr.  Is this flag_buf_ptr used as an additional buffer to 
extend the character buffer during the use of 
tty_insert_flip_string_flags() API?  When I looked into the 
implementation of the tty_insert_flip_string_flags API in tty_io.c, I 
was little confused.


Also, can any one explain me the function of the free queue head in the 
struct tty_bufhead?

Thanks,
Ananda

V. ANANDA KRISHNAN

Re: tty_flip_buffer

[Alan Cox]

On Maw, 2005-11-15 at 15:38 -0600, V. Ananda Krishnan wrote:
> tty_insert_flip_string_flags() API?  When I looked into the 
> implementation of the tty_insert_flip_string_flags API in tty_io.c, I 
> was little confused.

The flags buffer is used to hold the state of each character. Its
usually TTY_NORMAL and is set to TTY_NORMAL by the functions not taking
a flag value. It serves the same task as the flag buffer in the old
tty_flip.

> Also, can any one explain me the function of the free queue head in the 
> struct tty_bufhead?

Private to the tty layer pointer to allow small buffers as used with
byte at a time uarts to be recycled not freed/allocated

Alan