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Obtained from: partly from anancient patch of mine via 1.1.5

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Fix races for FIONREAD, TIOCSTI and TIOCSTAT.
This commit is contained in:
Bruce Evans 1995-07-21 17:30:12 +00:00
parent 283fecc144
commit 491cb8cd99
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9622
1 changed files with 11 additions and 3 deletions
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14
sys/kern/tty.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)tty.c 8.8 (Berkeley) 1/21/94
* $Id: tty.c,v 1.51 1995/07/21 14:41:43 bde Exp $
* $Id: tty.c,v 1.52 1995/07/21 16:30:51 bde Exp $
*/
/*-
@ -221,6 +221,9 @@ ttyopen(device, tp)
* Handle close() on a tty line: flush and set to initial state,
* bumping generation number so that pending read/write calls
* can detect recycling of the tty.
* XXX our caller should have done `spltty(); l_close(); ttyclose();'
* and l_close() should have flushed, but we repeat the spltty() and
* the flush in case there are buggy callers.
*/
int
ttyclose(tp)
@ -736,7 +739,9 @@ ttioctl(tp, cmd, data, flag)
case FIONBIO: /* set/clear non-blocking i/o */
break; /* XXX: delete. */
case FIONREAD: /* get # bytes to read */
s = spltty();
*(int *)data = ttnread(tp);
splx(s);
break;
case TIOCEXCL: /* set exclusive use of tty */
s = spltty();
@ -909,7 +914,9 @@ ttioctl(tp, cmd, data, flag)
return (EPERM);
if (p->p_ucred->cr_uid && !isctty(p, tp))
return (EACCES);
s = spltty();
(*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
splx(s);
break;
case TIOCSTOP: /* stop output, like ^S */
s = spltty();
@ -945,7 +952,9 @@ ttioctl(tp, cmd, data, flag)
break;
}
case TIOCSTAT: /* simulate control-T */
s = spltty();
ttyinfo(tp);
splx(s);
break;
case TIOCSWINSZ: /* set window size */
if (bcmp((caddr_t)&tp->t_winsize, data,
@ -1020,8 +1029,7 @@ ttselect(dev, rw, p)
}
/*
* This is now exported to the cy driver as well; if you hack this code,
* then be sure to keep /sys/i386/isa/cy.c properly advised! -jkh
* Must be called at spltty().
*/
static int
ttnread(tp)