[linux-2.6-block.git] / arch / um / drivers / stderr_console.c

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/console.h>

#include "chan_user.h"

/* ----------------------------------------------------------------------------- */
/* trivial console driver -- simply dump everything to stderr                    */

/*
 * Don't register by default -- as this registers very early in the
 * boot process it becomes the default console.
 *
 * Initialized at init time.
 */
static int use_stderr_console = 0;

static void stderr_console_write(struct console *console, const char *string,
				 unsigned len)
{
	generic_write(2 /* stderr */, string, len, NULL);
}

static struct console stderr_console = {
	.name		= "stderr",
	.write		= stderr_console_write,
	.flags		= CON_PRINTBUFFER,
};

static int __init stderr_console_init(void)
{
	if (use_stderr_console)
		register_console(&stderr_console);
	return 0;
}
console_initcall(stderr_console_init);

static int stderr_setup(char *str)
{
	if (!str)
		return 0;
	use_stderr_console = simple_strtoul(str,&str,0);
	return 1;
}
__setup("stderr=", stderr_setup);

/* The previous behavior of not unregistering led to /dev/console being
 * impossible to open.  My FC5 filesystem started having init die, and the
 * system panicing because of this.  Unregistering causes the real
 * console to become the default console, and /dev/console can then be
 * opened.  Making this an initcall makes this happen late enough that
 * there is no added value in dumping everything to stderr, and the
 * normal console is good enough to show you all available output.
 */
static int __init unregister_stderr(void)
{
	unregister_console(&stderr_console);

	return 0;
}

__initcall(unregister_stderr);
Commit	Line	Data
e16f5350	1	#include <linux/kernel.h>
1da177e4 LT	2	#include <linux/init.h>
	3	#include <linux/console.h>
	4
	5	#include "chan_user.h"
	6
	7	/* ----------------------------------------------------------------------------- */
	8	/* trivial console driver -- simply dump everything to stderr */
	9
	10	/*
b60745b9	11	* Don't register by default -- as this registers very early in the
6edb0862	12	* boot process it becomes the default console.
730760e9 JD	13	*
730760e9 JD	14	* Initialized at init time.
1da177e4 LT	15	*/
	16	static int use_stderr_console = 0;
	17
	18	static void stderr_console_write(struct console console, const char string,
	19	unsigned len)
	20	{
	21	generic_write(2 /* stderr */, string, len, NULL);
	22	}
	23
	24	static struct console stderr_console = {
da00d9a5 JD	25	.name = "stderr",
	26	.write = stderr_console_write,
	27	.flags = CON_PRINTBUFFER,
1da177e4 LT	28	};
	29
	30	static int __init stderr_console_init(void)
	31	{
	32	if (use_stderr_console)
	33	register_console(&stderr_console);
	34	return 0;
	35	}
	36	console_initcall(stderr_console_init);
	37
	38	static int stderr_setup(char *str)
	39	{
	40	if (!str)
	41	return 0;
	42	use_stderr_console = simple_strtoul(str,&str,0);
	43	return 1;
	44	}
	45	__setup("stderr=", stderr_setup);
6edb0862 JD	46
	47	/* The previous behavior of not unregistering led to /dev/console being
	48	* impossible to open. My FC5 filesystem started having init die, and the
	49	* system panicing because of this. Unregistering causes the real
	50	* console to become the default console, and /dev/console can then be
	51	* opened. Making this an initcall makes this happen late enough that
	52	* there is no added value in dumping everything to stderr, and the
	53	* normal console is good enough to show you all available output.
	54	*/
	55	static int __init unregister_stderr(void)
	56	{
	57	unregister_console(&stderr_console);
	58
	59	return 0;
	60	}
	61
	62	__initcall(unregister_stderr);