[src/trunk]: src/sys add /dev/full

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

details:   https://anonhg.NetBSD.org/src/rev/0182cd325b2f
branches:  trunk
changeset: 343000:0182cd325b2f
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 17 23:16:46 2016 +0000

description:
add /dev/full

diffstat:

 sys/dev/mm.c   |  9 +++++++--
 sys/sys/conf.h |  3 ++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diffs (47 lines):

diff -r 1984a3ac9fe1 -r 0182cd325b2f sys/dev/mm.c
--- a/sys/dev/mm.c      Sun Jan 17 22:51:32 2016 +0000
+++ b/sys/dev/mm.c      Sun Jan 17 23:16:46 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mm.c,v 1.19 2014/07/25 08:10:35 dholland Exp $ */
+/*     $NetBSD: mm.c,v 1.20 2016/01/17 23:17:04 christos Exp $ */
 
 /*-
  * Copyright (c) 2002, 2008, 2010 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mm.c,v 1.19 2014/07/25 08:10:35 dholland Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mm.c,v 1.20 2016/01/17 23:17:04 christos Exp $");
 
 #include "opt_compat_netbsd.h"
 
@@ -337,6 +337,11 @@
                        }
                        /* Break directly out of the loop. */
                        return 0;
+               case DEV_FULL:
+                       if (uio->uio_rw == UIO_WRITE) {
+                               return ENOSPC;
+                       }
+                       /*FALLTHROUGH*/
 #if defined(COMPAT_16) && defined(__arm)
                case _DEV_ZERO_oARM:
 #endif
diff -r 1984a3ac9fe1 -r 0182cd325b2f sys/sys/conf.h
--- a/sys/sys/conf.h    Sun Jan 17 22:51:32 2016 +0000
+++ b/sys/sys/conf.h    Sun Jan 17 23:16:46 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: conf.h,v 1.145 2014/07/25 07:56:14 dholland Exp $      */
+/*     $NetBSD: conf.h,v 1.146 2016/01/17 23:16:46 christos Exp $      */
 
 /*-
  * Copyright (c) 1990, 1993
@@ -235,6 +235,7 @@
 #ifdef COMPAT_16
 #define        _DEV_ZERO_oARM  3       /* reserved: old ARM /dev/zero minor */
 #endif
+#define DEV_FULL       11      /* minor device 11 is '\0'/ENOSPC */
 #define        DEV_ZERO        12      /* minor device 12 is '\0'/rathole */
 
 enum devnode_class {