util/os_socket: Add socket related functions.

v3:
 - Add os_socket.c/h into Makefile.sources (Lionel)
 - Add empty non-linux implementation to public functions.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/util/os_socket.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2019 Intel Corporation
+ * SPDX-License-Identifier: MIT
+ *
+ * Socket operations helpers
+ */
+
+#ifndef _OS_SOCKET_H_
+#define _OS_SOCKET_H_
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int os_socket_accept(int s);
+
+int os_socket_listen_abstract(const char *path, int count);
+
+ssize_t os_socket_recv(int socket, void *buffer, size_t length, int flags);
+ssize_t os_socket_send(int socket, const void *buffer, size_t length, int flags);
+
+void os_socket_block(int s, bool block);
+void os_socket_close(int s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _OS_SOCKET_H_ */