20060303

1 files changed, 39 insertions, 0 deletions

diff --git a/os/ip/nullmedium.c b/os/ip/nullmedium.c
new file mode 100644
index 00000000..bc575c05
--- /dev/null
+++ b/os/ip/nullmedium.c
@@ -0,0 +1,39 @@
+#include "u.h"
+#include "../port/lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+#include "../port/error.h"
+
+#include "ip.h"
+
+static void
+nullbind(Ipifc*, int, char**)
+{
+	error("cannot bind null device");
+}
+
+static void
+nullunbind(Ipifc*)
+{
+}
+
+static void
+nullbwrite(Ipifc*, Block*, int, uchar*)
+{
+	error("nullbwrite");
+}
+
+Medium nullmedium =
+{
+.name=		"null",
+.bind=		nullbind,
+.unbind=	nullunbind,
+.bwrite=	nullbwrite,
+};
+
+void
+nullmediumlink(void)
+{
+	addipmedium(&nullmedium);
+}