TIOCNOTTY

SCCS-vsn: sys/kern/tty_tty.c 4.5

diff --git a/usr/src/sys/kern/tty_tty.c b/usr/src/sys/kern/tty_tty.c
index 6219079..3c1078d 100644 (file)
--- a/usr/src/sys/kern/tty_tty.c
+++ b/usr/src/sys/kern/tty_tty.c
@@ -1,4 +1,4 @@
-/*     tty_tty.c       4.4     81/10/11        */
+/*     tty_tty.c       4.5     82/01/13        */

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


@@ -28,7 +28,7 @@ syopen(dev, flag)
 syread(dev)
 {
 
 syread(dev)
 {
 

-       if (u.u_procp->p_flag&SDETACH) {
+       if (u.u_ttyp == NULL || (u.u_procp->p_flag&SDETACH)) {

                u.u_error = ENXIO;
                return;
        }
                u.u_error = ENXIO;
                return;
        }


@@ -39,7 +39,7 @@ syread(dev)
 sywrite(dev)
 {
 
 sywrite(dev)
 {
 

-       if (u.u_procp->p_flag&SDETACH) {
+       if (u.u_ttyp == NULL || (u.u_procp->p_flag&SDETACH)) {

                u.u_error = ENXIO;
                return;
        }
                u.u_error = ENXIO;
                return;
        }


@@ -51,7 +51,13 @@ syioctl(dev, cmd, addr, flag)
 caddr_t addr;
 {
 
 caddr_t addr;
 {
 

-       if (u.u_procp->p_flag&SDETACH) {
+       if (cmd == TIOCNOTTY) {
+               u.u_ttyp = 0;
+               u.u_ttyd = 0;
+               u.u_procp->p_pgrp = 0;
+               return;
+       }
+       if (u.u_ttyp == NULL || (u.u_procp->p_flag&SDETACH)) {

                u.u_error = ENXIO;
                return;
        }
                u.u_error = ENXIO;
                return;
        }


@@ -61,9 +67,9 @@ caddr_t addr;
 syselect(dev, flag)
 {
 
 syselect(dev, flag)
 {
 

-       if (u.u_procp->p_flag&SDETACH) {
+       if (u.u_ttyp == NULL || (u.u_procp->p_flag&SDETACH)) {

                u.u_error = ENXIO;
                u.u_error = ENXIO;

-               return;
+               return (0);

        }
        }

-       (*cdevsw[major(u.u_ttyd)].d_select)(dev, flag);
+       return ((*cdevsw[major(u.u_ttyd)].d_select)(dev, flag));

 }
 }