lwip: Add LwIP-based TCP/IP translator

* Makefile (prog-subdirs): Add lwip.
* config.make.in (HAVE_LIBLWIP, liblwip_CFLAGS, liblwip_LIBS): Define
variables.
* configure.ac: Check for liblwip.
* lwip/: New directory.

1 files changed, 39 insertions, 0 deletions

diff --git a/lwip/startup-ops.c b/lwip/startup-ops.c
new file mode 100644
index 00000000..ac1fe547
--- /dev/null
+++ b/lwip/startup-ops.c
@@ -0,0 +1,39 @@
+/*
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <lwip_startup_notify_S.h>
+
+#include <lwip-hurd.h>
+
+/* The system is going down; destroy all the extant port rights.  That
+   will cause net channels and such to close promptly.  */
+error_t
+lwip_S_startup_dosync (mach_port_t handle)
+{
+  struct port_info *inpi = ports_lookup_port (lwip_bucket, handle,
+					      shutdown_notify_class);
+
+  if (!inpi)
+    return EOPNOTSUPP;
+
+  ports_class_iterate (socketport_class, ports_destroy_right);
+  ports_class_iterate (addrport_class, ports_destroy_right);
+  return 0;
+}