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Use the new ability to avoid practically all the gunk in this file.

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When people access /dev/tty, locate their controlling tty and return
the dev_t of it to them.  This basically makes /dev/tty act like
a variant symlink sort of thing which is much simpler than all the
mucking about with vnodes.
This commit is contained in:
Poul-Henning Kamp 2001-05-14 08:22:56 +00:00
parent f73cbde4cf
commit 241e77c8a5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76572
1 changed files with 26 additions and 17 deletions
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43
sys/kern/tty_tty.c
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@ -54,8 +54,8 @@ static d_ioctl_t cttyioctl;
static d_poll_t cttypoll;
#define CDEV_MAJOR 1
/* Don't make this static, since fdesc_vnops uses it. */
struct cdevsw ctty_cdevsw = {
static struct cdevsw ctty_cdevsw = {
/* open */ cttyopen,
/* close */ nullclose,
/* read */ cttyread,
@ -86,20 +86,7 @@ cttyopen(dev, flag, mode, p)
if (ttyvp == NULL)
return (ENXIO);
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
#ifdef PARANOID
/*
* Since group is tty and mode is 620 on most terminal lines
* and since sessions protect terminals from processes outside
* your session, this check is probably no longer necessary.
* Since it inhibits setuid root programs that later switch
* to another user from accessing /dev/tty, we have decided
* to delete this test. (mckusick 5/93)
*/
error = VOP_ACCESS(ttyvp,
(flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
if (!error)
#endif /* PARANOID */
error = VOP_OPEN(ttyvp, flag, NOCRED, p);
error = VOP_OPEN(ttyvp, flag, NOCRED, p);
VOP_UNLOCK(ttyvp, 0, p);
return (error);
}
@ -188,13 +175,35 @@ cttypoll(dev, events, p)
return (VOP_POLL(ttyvp, events, p->p_ucred, p));
}
static void ctty_clone __P((void *arg, char *name, int namelen, dev_t *dev));
static void
ctty_clone(void *arg, char *name, int namelen, dev_t *dev)
{
struct vnode *vp;
if (*dev != NODEV)
return;
if (strcmp(name, "tty"))
return;
vp = cttyvp(curproc);
if (vp == NULL)
return;
*dev = vp->v_rdev;
}
static void ctty_drvinit __P((void *unused));
static void
ctty_drvinit(unused)
void *unused;
{
make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
if (devfs_present) {
EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000);
} else {
make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
}
}
SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)