+#ifdef HAVE_STRUCT_CMSGHDR
+int
+Mono_Posix_FromCmsghdr (struct Mono_Posix_Cmsghdr *from, struct cmsghdr *to)
+{
+ _cnm_return_val_if_overflow (gint64, from->cmsg_len, -1);
+
+ memset (to, 0, sizeof(*to));
+
+ to->cmsg_len = from->cmsg_len;
+ if (Mono_Posix_FromUnixSocketProtocol (from->cmsg_level, &to->cmsg_level) != 0) {
+ return -1;
+ }
+ if (Mono_Posix_FromUnixSocketControlMessage (from->cmsg_type, &to->cmsg_type) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+#endif /* ndef HAVE_STRUCT_CMSGHDR */
+
+
+#ifdef HAVE_STRUCT_CMSGHDR
+int
+Mono_Posix_ToCmsghdr (struct cmsghdr *from, struct Mono_Posix_Cmsghdr *to)
+{
+ _cnm_return_val_if_overflow (gint64, from->cmsg_len, -1);
+
+ memset (to, 0, sizeof(*to));
+
+ to->cmsg_len = from->cmsg_len;
+ if (Mono_Posix_ToUnixSocketProtocol (from->cmsg_level, &to->cmsg_level) != 0) {
+ return -1;
+ }
+ if (Mono_Posix_ToUnixSocketControlMessage (from->cmsg_type, &to->cmsg_type) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+#endif /* ndef HAVE_STRUCT_CMSGHDR */
+
+