--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sin_util.h	Sun Mar 05 00:05:46 2017 +0000
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016 Mario de Sousa (msousa@fe.up.pt)
+ *
+ * This file is part of the Modbus library for Beremiz and matiec.
+ *
+ * This Modbus library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser 
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this Modbus library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+
+#ifndef SIN_UTIL_H
+#define SIN_UTIL_H
+
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+
+
+/* Create a socket for the IP protocol family, and connect to remote host. */
+int sin_connsock(const char *host, const char *service, const char *protocol);
+
+/* Create a socket for the IP protocol family, and bind to local host's port. */
+int sin_bindsock(const char *host, const char *service, const char *protocol);
+
+/* Initialize a in_addr structure */
+int sin_initaddr(struct sockaddr_in *sin,
+                 const char *host,    int allow_null_host, // 1 => allow host NULL, "" or "*" -> INADDR_ANY
+                 const char *service, int allow_null_serv, // 1 => allow serivce NULL or ""   -> port = 0
+                 const char *protocol);
+#endif