[src/trunk]: src/sys/arch/usermode/dev check return value of write, make sure...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/21e6869b426b
branches:  trunk
changeset: 772155:21e6869b426b
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Tue Dec 20 21:35:16 2011 +0000

description:
check return value of write, make sure we send the whole buffer to stdout

diffstat:

 sys/arch/usermode/dev/ttycons.c |  18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)

diffs (46 lines):

diff -r def6f4565b45 -r 21e6869b426b sys/arch/usermode/dev/ttycons.c
--- a/sys/arch/usermode/dev/ttycons.c   Tue Dec 20 21:27:29 2011 +0000
+++ b/sys/arch/usermode/dev/ttycons.c   Tue Dec 20 21:35:16 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ttycons.c,v 1.12 2011/12/15 01:04:15 jmcneill Exp $ */
+/* $NetBSD: ttycons.c,v 1.13 2011/12/20 21:35:16 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2007 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ttycons.c,v 1.12 2011/12/15 01:04:15 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ttycons.c,v 1.13 2011/12/20 21:35:16 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -302,7 +302,8 @@
 ttycons_start(struct tty *t)
 {
        u_char buf[80+1];
-       int s, len; //, i;
+       u_char *p = buf;
+       int s, len, brem;
 
        s = spltty();
        if (t->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP)) {
@@ -312,8 +313,15 @@
        t->t_state |= TS_BUSY;
        splx(s);
 
-       len = q_to_b(&t->t_outq, buf, sizeof(buf) - 1);
-       thunk_write(1, buf, len);
+       brem = q_to_b(&t->t_outq, buf, sizeof(buf) - 1);
+
+       while (brem > 0) {
+               len = thunk_write(1, p, brem);
+               if (len > 0) {
+                       p += len;
+                       brem -= len;
+               }
+       }
 
        s = spltty();
        t->t_state &= ~TS_BUSY;