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diff --git a/src/include/anastasis_util_lib.h b/src/include/anastasis_util_lib.h
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+++ b/src/include/anastasis_util_lib.h
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+/*
+  This file is part of Anastasis
+  Copyright (C) 2020 Taler Systems SA
+
+  Anastasis 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, or (at your option) any later version.
+
+  Anastasis 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
+  Anastasis; see the file COPYING.GPL.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file include/anastasis_util_lib.h
+ * @brief anastasis client api
+ * @author Christian Grothoff
+ * @author Dominik Meister
+ * @author Dennis Neufeld
+ */
+#ifndef ANASTASIS_UTIL_LIB_H
+#define ANASTASIS_UTIL_LIB_H
+
+#include "anastasis_error_codes.h"
+#define GNU_TALER_ERROR_CODES_H 1
+#include <gnunet/gnunet_util_lib.h>
+#include <taler/taler_util.h>
+
+
+/**
+ * Return default project data used by Anastasis.
+ */
+const struct GNUNET_OS_ProjectData *
+ANASTASIS_project_data_default (void);
+
+
+/**
+ * Handle for the child management
+ */
+struct ANASTASIS_ChildWaitHandle;
+
+/**
+ * Defines a ANASTASIS_ChildCompletedCallback which is sent back
+ * upon death or completion of a child process. Used to trigger
+ * authentication commands.
+ *
+ * @param cls handle for the callback
+ * @param type type of the process
+ * @param exit_code status code of the process
+ *
+*/
+typedef void
+(*ANASTASIS_ChildCompletedCallback)(void *cls,
+                                    enum GNUNET_OS_ProcessStatusType type,
+                                    long unsigned int exit_code);
+
+
+/**
+ * Starts the handling of the child processes.
+ * Function checks the status of the child process and sends back a
+ * ANASTASIS_ChildCompletedCallback upon completion/death of the child.
+ *
+ * @param proc child process which is monitored
+ * @param cb reference to the callback which is called after completion
+ * @param cb_cls closure for the callback
+ * @return ANASTASIS_ChildWaitHandle is returned
+ */
+struct ANASTASIS_ChildWaitHandle *
+ANASTASIS_wait_child (struct GNUNET_OS_Process *proc,
+                      ANASTASIS_ChildCompletedCallback cb,
+                      void *cb_cls);
+
+/**
+ * Stop waiting on this child.
+ */
+void
+ANASTASIS_wait_child_cancel (struct ANASTASIS_ChildWaitHandle *cwh);
+
+
+#endif