4.4BSD snapshot (revision 8.1); add 1993 to copyright

[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 7d8f258..3224129 100644 (file)
--- a/usr/src/sys/kern/tty_tty.c
+++ b/usr/src/sys/kern/tty_tty.c
@@ -1,87 +1,121 @@
-/*
- * 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.
+ *
+ * %sccs.include.redist.c%

  *
  *

- *     @(#)tty_tty.c   7.1 (Berkeley) %G%
+ *     @(#)tty_tty.c   8.1 (Berkeley) %G%

  */
 
 /*
  * 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&SCTTY ? (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)
+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));
+       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)
+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));
+       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) {

-               u.u_ttyp = 0;
-               u.u_ttyd = 0;
-               u.u_procp->p_pgrp = 0;
-               return (0);
+               if (!SESS_LEADER(p)) {
+                       p->p_flag &= ~SCTTY;
+                       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));

 }
 }