The feature is useful to inline user messages with kernel
messages.
In order to use this feature, you should output user messages
- to /dev/ttyprintk or redirect console to this TTY.
+ to /dev/ttyprintk or redirect console to this TTY, or boot
+ the kernel with console=ttyprintk.
If unsure, say N.
* of the boot process, for example.
*/
+#include <linux/console.h>
#include <linux/device.h>
#include <linux/serial.h>
#include <linux/tty.h>
static struct tty_driver *ttyprintk_driver;
+static struct tty_driver *ttyprintk_console_device(struct console *c,
+ int *index)
+{
+ *index = 0;
+ return ttyprintk_driver;
+}
+
+static struct console ttyprintk_console = {
+ .name = "ttyprintk",
+ .device = ttyprintk_console_device,
+};
+
static int __init ttyprintk_init(void)
{
int ret;
goto error;
}
+ register_console(&ttyprintk_console);
+
return 0;
error:
static void __exit ttyprintk_exit(void)
{
+ unregister_console(&ttyprintk_console);
tty_unregister_driver(ttyprintk_driver);
tty_driver_kref_put(ttyprintk_driver);
tty_port_destroy(&tpk_port.port);