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tty: add 'active' sysfs attribute to tty0 and console device

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tty: add 'active' sysfs attribute to tty0 and console device

Userspace can query the actual virtual console, and the configured
console devices behind /dev/tt0 and /dev/console.

The last entry in the list of devices is the active device, analog
to the console= kernel command line option.

The attribute supports poll(), which is raised when the virtual
console is changed or /dev/console is reconfigured.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

index 0000000..b138b66
This commit is contained in:
Kay Sievers
2010-12-01 18:51:05 +01:00
committed by Greg Kroah-Hartman
parent 35c64e5d13
commit fbc92a3455
5 changed files with 87 additions and 6 deletions
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include/linux/console.h
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@@ -151,7 +151,7 @@ extern int is_console_locked(void);
extern int braille_register_console(struct console *, int index,
char *console_options, char *braille_options);
extern int braille_unregister_console(struct console *);
extern void console_sysfs_notify(void);
extern int console_suspend_enabled;
/* Suspend and resume console messages over PM events */