go.net/ipv4: add platform-dependent code
The syscall package of standard library is now locked down
and go.sys/unix is under curation. Also go.sys/unix doesn't
help supporting go1.3 and earlier users. There's no way to
extend this package without holding the platform adaptation
code.
LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/146740043
diff --git a/ipv4/defs_openbsd.go b/ipv4/defs_openbsd.go
new file mode 100644
index 0000000..8642354
--- /dev/null
+++ b/ipv4/defs_openbsd.go
@@ -0,0 +1,37 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// +godefs map struct_in_addr [4]byte /* in_addr */
+
+package ipv4
+
+/*
+#include <netinet/in.h>
+*/
+import "C"
+
+const (
+ sysIP_OPTIONS = C.IP_OPTIONS
+ sysIP_HDRINCL = C.IP_HDRINCL
+ sysIP_TOS = C.IP_TOS
+ sysIP_TTL = C.IP_TTL
+ sysIP_RECVOPTS = C.IP_RECVOPTS
+ sysIP_RECVRETOPTS = C.IP_RECVRETOPTS
+ sysIP_RECVDSTADDR = C.IP_RECVDSTADDR
+ sysIP_RETOPTS = C.IP_RETOPTS
+ sysIP_RECVIF = C.IP_RECVIF
+ sysIP_RECVTTL = C.IP_RECVTTL
+
+ sysIP_MULTICAST_IF = C.IP_MULTICAST_IF
+ sysIP_MULTICAST_TTL = C.IP_MULTICAST_TTL
+ sysIP_MULTICAST_LOOP = C.IP_MULTICAST_LOOP
+ sysIP_ADD_MEMBERSHIP = C.IP_ADD_MEMBERSHIP
+ sysIP_DROP_MEMBERSHIP = C.IP_DROP_MEMBERSHIP
+
+ sysSizeofIPMreq = C.sizeof_struct_ip_mreq
+)
+
+type sysIPMreq C.struct_ip_mreq
