fantastic, thanks! unfortunately......
opensuse103:/home/roland/serialcons # ./mytioccons ioctl: Device or resource busy but, it`s not userspace: opensuse103:/home/roland # lsof |egrep "console|ttyS0" opensuse103:/home/roland # in tty_io.c -> ticoccons() there is if (redirect) { spin_unlock(&redirect_lock); return -EBUSY; } but i`m not deep enough into programming to understand this. ------------------- mytioccons.c #include <sys/ioctl.h> #include <sys/stat.h> #include <sys/types.h> #include <fcntl.h> #include <libio.h> #include <errno.h> #include <stdio.h> int main(void) { int fd = open("/dev/ttyS0", O_RDWR); int errno; ioctl(0, TIOCCONS, NULL); if (ioctl(fd, TIOCCONS, NULL) < 0) printf("ioctl: %s\n", strerror(errno)); } ------------------- > -----Ursprüngliche Nachricht----- > Von: "Jan Engelhardt" <[EMAIL PROTECTED]> > Gesendet: 03.01.08 14:28:45 > An: [EMAIL PROTECTED] > CC: linux-kernel@vger.kernel.org > Betreff: Re: serial console _after_ boot ? - was: Redirect kernel console > > > 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); > } > __________________________________________________________________________ Erweitern Sie FreeMail zu einem noch leistungsstärkeren E-Mail-Postfach! Mehr Infos unter http://produkte.web.de/club/?mc=021131 -- 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/