static int
sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
{
int error;
udev_t ndumpdev;
ndumpdev = dev2udev(dumpdev);
error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
if (error == 0 && req->newptr != NULL)
error = setdumpdev(udev2dev(ndumpdev, 0));
return (error);
}
static int
snpioctl(struct dev_ioctl_args *ap)
{
cdev_t dev = ap->a_head.a_dev;
struct snoop *snp;
struct tty *tp, *tpo;
cdev_t tdev;
int ret;
lwkt_gettoken(&tty_token);
snp = dev->si_drv1;
switch (ap->a_cmd) {
case SNPSTTY:
tdev = udev2dev(*((udev_t *)ap->a_data), 0);
if (tdev == NULL) {
lwkt_reltoken(&tty_token);
ret = snp_down(snp);
return ret;
}
tp = snpdevtotty(tdev);
if (!tp) {
lwkt_reltoken(&tty_token);
return (EINVAL);
}
if (tp->t_state & TS_SNOOP) {
lwkt_reltoken(&tty_token);
return (EBUSY);
}
crit_enter();
if (snp->snp_target == NULL) {
tpo = snp->snp_tty;
if (tpo)
tpo->t_state &= ~TS_SNOOP;
}
tp->t_sc = (caddr_t)snp;
tp->t_state |= TS_SNOOP;
snp->snp_olddisc = tp->t_line;
tp->t_line = snooplinedisc;
snp->snp_tty = tp;
snp->snp_target = tdev;
/*
* Clean overflow and down flags -
* we'll have a chance to get them in the future :)))
*/
snp->snp_flags &= ~SNOOP_OFLOW;
snp->snp_flags &= ~SNOOP_DOWN;
crit_exit();
break;
case SNPGTTY:
/*
* We keep snp_target field specially to make
* SNPGTTY happy, else we can't know what is device
* major/minor for tty.
*/
*((cdev_t *)ap->a_data) = snp->snp_target;
break;
case FIOASYNC:
if (*(int *)ap->a_data)
snp->snp_flags |= SNOOP_ASYNC;
else
snp->snp_flags &= ~SNOOP_ASYNC;
break;
case FIONREAD:
crit_enter();
if (snp->snp_tty != NULL)
*(int *)ap->a_data = snp->snp_len;
else
if (snp->snp_flags & SNOOP_DOWN) {
if (snp->snp_flags & SNOOP_OFLOW)
*(int *)ap->a_data = SNP_OFLOW;
else
*(int *)ap->a_data = SNP_TTYCLOSE;
} else {
*(int *)ap->a_data = SNP_DETACH;
}
crit_exit();
break;
default:
lwkt_reltoken(&tty_token);
return (ENOTTY);
}
lwkt_reltoken(&tty_token);
return (0);
}
