On Jan 3 2008 13:43, [EMAIL PROTECTED] wrote:
>
>hi !
>
>i was wondering how to make kernel messages appear on /dev/ttyS0 without a
>reboot, i.e. kernelparam "console=ttyS0"
The solution is simple... the following piece of code is inside
opensuse-10.3/src/sysvinit-2.86-115.src.rpm#showconsole-1.08.tar.bz2#showconsole-1.08/blogd.c
(void)ioctl(0, TIOCCONS, NULL); /* Undo any current map if any */
if (ioctl(pts, TIOCCONS, NULL) < 0)
error("can not set console device to %s: %s\n", ptsname,
strerror(errno));
so I suppose that's it. Write up a new program that calls the ioctl
on a tty, and you should be done. IOW:
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
int main(void)
{
int fd = open("/dev/ttyS0", O_RDWR);
ioctl(0, TIOCCONS, NULL);
ioctl(fd, TIOCCONS, NULL);
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
