60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#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 registeres very early in the
|
|
* boot process it becomes the default console.
|
|
*/
|
|
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);
|