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tty: More driver operations

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We have the lookup operation abstracted which is nice for pty cleanup but
we really want to abstract the add/remove entries as well so that we can
pull the pty code out of the tty core and create a clear defined interface
for the tty driver table.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-10-13 10:42:19 +01:00 • committed by Linus Torvalds
parent 7d7b93c145
commit 8b0a88d591
3 changed files with 79 additions and 10 deletions
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16
include/linux/tty_driver.h
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@ -15,6 +15,20 @@
*
* Optional method. Default behaviour is to use the ttys array
*
* int (*install)(struct tty_driver *self, struct tty_struct *tty)
*
* Install a new tty into the tty driver internal tables. Used in
* conjunction with lookup and remove methods.
*
* Optional method. Default behaviour is to use the ttys array
*
* void (*remove)(struct tty_driver *self, struct tty_struct *tty)
*
* Remove a closed tty from the tty driver internal tables. Used in
* conjunction with lookup and remove methods.
*
* Optional method. Default behaviour is to use the ttys array
*
* int (*open)(struct tty_struct * tty, struct file * filp);
*
* This routine is called when a particular tty device is opened.
@ -212,6 +226,8 @@ struct tty_driver;
struct tty_operations {
struct tty_struct * (*lookup)(struct tty_driver *driver, int idx);
int (*install)(struct tty_driver *driver, struct tty_struct *tty);
void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
int (*open)(struct tty_struct * tty, struct file * filp);
void (*close)(struct tty_struct * tty, struct file * filp);
void (*shutdown)(struct tty_struct *tty);