BSD 4_4_Lite1 release

[unix-history] / usr / src / sys / kern / tty_tty.c

diff --git a/usr/src/sys/kern/tty_tty.c b/usr/src/sys/kern/tty_tty.c
index 71151bf..964fc6f 100644 (file)
--- a/usr/src/sys/kern/tty_tty.c
+++ b/usr/src/sys/kern/tty_tty.c
@@ -1,93 +1,147 @@
-/*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+/*-
+ * Copyright (c) 1982, 1986, 1991, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.

  *
  *

- *     @(#)tty_tty.c   7.3 (Berkeley) %G%
+ *     @(#)tty_tty.c   8.2 (Berkeley) 9/23/93

  */
 
 /*
  * Indirect driver for controlling tty.
  */
 
 /*
  * Indirect driver for controlling tty.

- *
- * THIS IS GARBAGE: MUST SOON BE DONE WITH struct inode * IN PROC TABLE.

  */
  */

-#include "param.h"
-#include "systm.h"
-#include "conf.h"
-#include "dir.h"
-#include "user.h"
-#include "ioctl.h"
-#include "tty.h"
-#include "proc.h"
-#include "uio.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/ioctl.h>
+#include <sys/proc.h>
+#include <sys/tty.h>
+#include <sys/vnode.h>
+#include <sys/file.h>
+
+#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)

 
 /*ARGSUSED*/
 
 /*ARGSUSED*/

-syopen(dev, flag)
+cttyopen(dev, flag, mode, p)

        dev_t dev;
        dev_t dev;

-       int flag;
+       int flag, mode;
+       struct proc *p;

 {
 {

+       struct vnode *ttyvp = cttyvp(p);
+       int error;

 
 

-       if (u.u_ttyp == NULL)
+       if (ttyvp == NULL)

                return (ENXIO);
                return (ENXIO);

-       return ((*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag));
+       VOP_LOCK(ttyvp);
+#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);
+       VOP_UNLOCK(ttyvp);
+       return (error);

 }
 
 /*ARGSUSED*/
 }
 
 /*ARGSUSED*/

-syread(dev, uio, flag)
+cttyread(dev, uio, flag)

        dev_t dev;
        struct uio *uio;
        dev_t dev;
        struct uio *uio;

+       int flag;

 {
 {

+       register struct vnode *ttyvp = cttyvp(uio->uio_procp);
+       int error;

 
 

-       if (u.u_ttyp == NULL)
-               return (ENXIO);
-       return ((*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd, uio, flag));
+       if (ttyvp == NULL)
+               return (EIO);
+       VOP_LOCK(ttyvp);
+       error = VOP_READ(ttyvp, uio, flag, NOCRED);
+       VOP_UNLOCK(ttyvp);
+       return (error);

 }
 
 /*ARGSUSED*/
 }
 
 /*ARGSUSED*/

-sywrite(dev, uio, flag)
+cttywrite(dev, uio, flag)

        dev_t dev;
        struct uio *uio;
        dev_t dev;
        struct uio *uio;

+       int flag;

 {
 {

+       register struct vnode *ttyvp = cttyvp(uio->uio_procp);
+       int error;

 
 

-       if (u.u_ttyp == NULL)
-               return (ENXIO);
-       return ((*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd, uio, flag));
+       if (ttyvp == NULL)
+               return (EIO);
+       VOP_LOCK(ttyvp);
+       error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
+       VOP_UNLOCK(ttyvp);
+       return (error);

 }
 
 /*ARGSUSED*/
 }
 
 /*ARGSUSED*/

-syioctl(dev, cmd, addr, flag)
+cttyioctl(dev, cmd, addr, flag, p)

        dev_t dev;
        int cmd;
        caddr_t addr;
        int flag;
        dev_t dev;
        int cmd;
        caddr_t addr;
        int flag;

+       struct proc *p;

 {
 {

+       struct vnode *ttyvp = cttyvp(p);

 
 

+       if (ttyvp == NULL)
+               return (EIO);

        if (cmd == TIOCNOTTY) {
        if (cmd == TIOCNOTTY) {

-               if (SESS_LEADER(u.u_procp)) {
-                       /* 
-                        * XXX - check posix draft
-                        */
-                       u.u_ttyp->t_session = 0;
-                       u.u_ttyp->t_pgid = 0;
-               }
-               u.u_ttyp = 0;
-               u.u_ttyd = 0;
-               return (0);
+               if (!SESS_LEADER(p)) {
+                       p->p_flag &= ~P_CONTROLT;
+                       return (0);
+               } else
+                       return (EINVAL);

        }
        }

-       if (u.u_ttyp == NULL)
-               return (ENXIO);
-       return ((*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag));
+       return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));

 }
 
 /*ARGSUSED*/
 }
 
 /*ARGSUSED*/

-syselect(dev, flag)
+cttyselect(dev, flag, p)

        dev_t dev;
        int flag;
        dev_t dev;
        int flag;

+       struct proc *p;

 {
 {

+       struct vnode *ttyvp = cttyvp(p);

 
 

-       if (u.u_ttyp == NULL) {
-               u.u_error = ENXIO;
-               return (0);
-       }
-       return ((*cdevsw[major(u.u_ttyd)].d_select)(u.u_ttyd, flag));
+       if (ttyvp == NULL)
+               return (1);     /* try operation to get EOF/failure */
+       return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));

 }
 }