Date: Fri, 11 Jun 1999 15:48:19 +0200 From: Jos Backus <Jos.Backus@nl.origin-it.com> To: current@freebsd.org Subject: Snoop device broken Message-ID: <19990611154819.E21893@hal.mpn.cp.philips.com>
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With a kernel built on June 9th, I am seeing the following:
hal:/sys/kern# w -h | grep jos
jos p1 :0.0 Wed03PM - /usr/local/bin/vim /ho
# watch p1
watch: fatal: cannot attach to tty
#
kdump output:
25537 watch CALL open(0xbfbfd8f4,0,0xbfbfd9e4)
25537 watch NAMI "/dev/snp0"
25537 watch RET open 3
25537 watch CALL stat(0xbfbfd504,0xbfbfd4a4)
25537 watch NAMI "/dev/ttyp1"
25537 watch RET stat 0
25537 watch CALL ioctl(0x3,SNPSTTY,0x804ac80)
25537 watch RET ioctl -1 errno 22 Invalid argument
25537 watch CALL ioctl(0,TIOCSETA,0x804b0a0)
25537 watch RET ioctl 0
25537 watch CALL write(0x2,0xbfbfcd04,0x7)
25537 watch GIO fd 2 wrote 7 bytes
"watch: "
25537 watch RET write 7
25537 watch CALL write(0x2,0xbfbfcd1c,0x1b)
25537 watch GIO fd 2 wrote 27 bytes
"fatal: cannot attach to tty"
25537 watch RET write 27/0x1b
25537 watch CALL write(0x2,0xbfbfcd08,0x1)
25537 watch GIO fd 2 wrote 1 byte
"
"
25537 watch RET write 1
25537 watch CALL exit(0x45)
The following code in sys/kern/tty_snoop.c seems responsible:
tp = snpdevtotty(tdev);
if (!tp)
return (EINVAL);
which in turn leads to
static struct tty *
snpdevtotty (dev)
dev_t dev;
{
struct cdevsw *cdp;
cdp = devsw(dev);
if (cdp == NULL)
return (NULL);
return ((*cdp->d_devtotty)(dev));
}
Apparently cdp is set to NULL here by the ``devsw(dev)'' call.
I suspect that this issue is related to the recent dev_t changes.
Is anyone else seeing this?
Thanks,
--
Jos Backus _/ _/_/_/ "Reliability means never
_/ _/ _/ having to say you're sorry."
_/ _/_/_/ -- D. J. Bernstein
_/ _/ _/ _/
Jos.Backus@nl.origin-it.com _/_/ _/_/_/ use Std::Disclaimer;
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