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diff --git a/src/ipcpd/ipcp-data.h b/src/ipcpd/ipcp-data.h
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+++ b/src/ipcpd/ipcp-data.h
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+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Utitilies for building IPC processes
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef IPCPD_IPCP_DATA_H
+#define IPCPD_IPCP_DATA_H
+
+#include <ouroboros/common.h>
+#include <ouroboros/instance_name.h>
+#include <ouroboros/list.h>
+#include <ouroboros/flow.h>
+#include <sys/types.h>
+#include <pthread.h>
+
+#include "ipcp-ops.h"
+
+struct ipcp_data {
+        instance_name_t   * iname;
+        enum ipcp_type      type;
+
+        struct shm_du_map * dum;
+
+        struct list_head    registry;
+        pthread_mutex_t     reg_lock;
+
+        struct list_head    flows;
+        pthread_mutex_t     flow_lock;
+
+        struct list_head    directory;
+        pthread_mutex_t     dir_lock;
+
+        pthread_mutex_t     lock;
+};
+
+struct ipcp_data * ipcp_data_create();
+struct ipcp_data * ipcp_data_init(struct ipcp_data * dst,
+                                  instance_name_t *  iname,
+                                  enum ipcp_type     ipcp_type);
+void               ipcp_data_destroy(struct ipcp_data * data);
+
+int          ipcp_data_add_reg_entry(struct ipcp_data * data,
+                                     char *             ap_name,
+                                     uint32_t           reg_ap_id);
+int          ipcp_data_del_reg_entry(struct ipcp_data * data,
+                                     uint32_t           reg_ap_id);
+int          ipcp_data_add_dir_entry(struct ipcp_data * data,
+                                     char *             ap_name,
+                                     uint64_t           addr);
+int          ipcp_data_del_dir_entry(struct ipcp_data * data,
+                                     const char *       ap_name,
+                                     uint64_t           addr);
+bool         ipcp_data_is_in_registry(struct ipcp_data * data,
+                                      const char *       ap_name);
+uint32_t     ipcp_data_get_reg_ap_id(struct ipcp_data * data,
+                                     const char *       ap_name);
+const char * ipcp_data_get_reg_ap_name(struct ipcp_data * data,
+                                       uint32_t           reg_ap_id);
+bool         ipcp_data_is_in_directory(struct ipcp_data * data,
+                                       const char *       ap_name);
+uint64_t     ipcp_data_get_addr(struct ipcp_data * data,
+                                const char *       ap_name);
+bool         ipcp_data_has_flow(struct ipcp_data * data,
+                                uint32_t           port_id);
+bool         ipcp_data_has_flow_s(struct ipcp_data * data,
+                                  uint32_t           port_id,
+                                  enum flow_state    state);
+int          ipcp_data_add_flow(struct ipcp_data * data,
+                                flow_t *           flow);
+int          ipcp_data_remove_flow(struct ipcp_data * data,
+                                   uint32_t           port_id);
+
+#endif /* IPCPD_IPCP_DATA_H */