return EWOULDBLOCK on read w/ no carrier or NBIO in raw mode

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

diff --git a/usr/src/sys/kern/tty.c b/usr/src/sys/kern/tty.c
index 249f92e..e2e9733 100644 (file)
--- a/usr/src/sys/kern/tty.c
+++ b/usr/src/sys/kern/tty.c
@@ -1,4 +1,4 @@
-/*     tty.c   6.3     83/09/25        */
+/*     tty.c   6.4     83/09/25        */

 
 #include "../machine/reg.h"
 
 
 #include "../machine/reg.h"
 


@@ -1045,7 +1045,7 @@ loop:
                        if ((tp->t_state&TS_CARR_ON) == 0 ||
                            (tp->t_state&TS_NBIO)) {
                                splx(s);
                        if ((tp->t_state&TS_CARR_ON) == 0 ||
                            (tp->t_state&TS_NBIO)) {
                                splx(s);

-                               return (0);
+                               return (EWOULDBLOCK);

                        }
                        sleep((caddr_t)&tp->t_rawq, TTIPRI);
                        splx(s);
                        }
                        sleep((caddr_t)&tp->t_rawq, TTIPRI);
                        splx(s);