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diff --git a/src/log-interface.h b/src/log-interface.h
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+/*
+ * log-interface.h
+ *
+ *
+ * Authors:
+ *  Michi <st101564@stud.uni-stuttgart.de>
+ *
+ * Web page: https://ahoi.io/project/oregano
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * Use this interface to get rid of GUI dependencies. For example
+ * if you want to write a unit test in which the test function
+ * needs a log to not throw an exception.
+ */
+
+#ifndef LOG_INTERFACE_H_
+#define LOG_INTERFACE_H_
+
+typedef void (*LogFunction)(gpointer log, const char *message);
+
+typedef struct {
+	LogFunction log_append;
+	LogFunction log_append_error;
+	gpointer log;
+} LogInterface;
+
+#endif /* LOG_INTERFACE_H_ */