posix: add uio header, make utsname.h includable from c files

api/posix/sys/uio.h

@@ -0,0 +1,38 @@
+// This file is a part of the IncludeOS unikernel - www.includeos.org
+//
+// Copyright 2015-2017 Oslo and Akershus University College of Applied Sciences
+// and Alfred Bratterud
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#ifndef POSIX_SYS_UIO_H
+#define POSIX_SYS_UIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct iovec {
+  void   *iov_base; // Base address of a memory region for input or output
+  size_t  iov_len; // Size of memory pointed to by iov_base
+};
+
+ssize_t readv(int, const struct iovec *, int);
+ssize_t writev(int, const struct iovec *, int);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // POSIX_SYS_UIO_H

api/posix/sys/utsname.h

@@ -23,9 +23,9 @@
 extern "C" {
 #endif
 
-struct utsname {
-  static const int LENGTH = 256;
+static const int LENGTH = 256;
 
+struct utsname {
   /* Name of this implementation of the operating system */
   char sysname[LENGTH];