--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/applib/dtn_ipc.h	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,151 @@
+/*
+ *    Copyright 2004-2006 Intel Corporation
+ * 
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#ifndef DTN_IPC_H
+#define DTN_IPC_H
+
+#include <rpc/rpc.h>
+
+#ifdef __CYGWIN__
+#include <stdio.h>
+#include <string.h>
+#include <cygwin/socket.h>
+#endif
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/*************************************************************
+ *
+ * Internal structures and functions that implement the DTN
+ * IPC layer. Generally, this is not exposed to applications.
+ *
+ *************************************************************/
+
+/**
+ * DTN IPC version. Just a simple number for now; we can refine it to
+ * a major/minor version later if desired.
+ *
+ * This currently cannot exceed 16 bits in width.
+ *
+ * Make sure to bump this when changing any data structures, message
+ * types, adding functions, etc.
+ */
+#define DTN_IPC_VERSION 7
+
+/**
+ * Default api ports. The handshake port is used for initial contact
+ * with the daemon to establish a session, and the latter is used for
+ * individual sessions.
+ */
+#define DTN_IPC_PORT 5010
+
+/**
+ * The maximum IPC message size (in bytes). Used primarily for
+ * efficiency in buffer allocation since the transport uses TCP.
+ */
+#define DTN_MAX_API_MSG 65536
+
+/**
+ * State of a DTN IPC channel.
+ */
+struct dtnipc_handle {
+    int sock;				///< Socket file descriptor
+    int err;				///< Error code
+    int in_poll;			///< Flag to register a call to poll()
+    int debug;				///< Debug flag for channel
+    char buf[DTN_MAX_API_MSG];		///< send/recv buffer
+    XDR xdr_encode;			///< XDR encoder
+    XDR xdr_decode;			///< XDR decoder
+    unsigned int total_sent;		///< Counter for debugging
+    unsigned int total_rcvd;		///< Counter for debugging
+};
+
+typedef struct dtnipc_handle dtnipc_handle_t;
+
+/**
+ * Type codes for api messages.
+ */
+typedef enum {
+    DTN_OPEN	    		= 1,
+    DTN_CLOSE			= 2,
+    DTN_LOCAL_EID		= 3,
+    DTN_REGISTER		= 4,
+    DTN_UNREGISTER		= 5,
+    DTN_FIND_REGISTRATION	= 6,
+    DTN_CHANGE_REGISTRATION	= 7,
+    DTN_BIND			= 8,
+    DTN_UNBIND			= 9,
+    DTN_SEND			= 10,
+    DTN_RECV			= 11,
+    DTN_BEGIN_POLL		= 12,
+    DTN_CANCEL_POLL		= 13,
+    DTN_CANCEL          	= 14,
+    DTN_SESSION_UPDATE         	= 15
+} dtnapi_message_type_t;
+
+/**
+ * Type code to string conversion routine.
+ */
+const char* dtnipc_msgtoa(u_int8_t type);
+
+/*
+ * Initialize the handle structure and a new ipc session with the
+ * daemon.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int dtnipc_open(dtnipc_handle_t* handle);
+
+/*
+ * Clean up the handle. dtnipc_open must have already been called on
+ * the handle.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int dtnipc_close(dtnipc_handle_t* handle);
+    
+/*
+ * Send a message over the dtn ipc protocol.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int dtnipc_send(dtnipc_handle_t* handle, dtnapi_message_type_t type);
+
+/*
+ * Receive a message response on the ipc channel. May block if there
+ * is no pending message.
+ *
+ * Sets status to the server-returned status code and returns the
+ * length of any reply message on success, returns -1 on internal
+ * error.
+ */
+int dtnipc_recv(dtnipc_handle_t* handle, int* status);
+
+/**
+ * Send a message and wait for a response over the dtn ipc protocol.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int dtnipc_send_recv(dtnipc_handle_t* handle, dtnapi_message_type_t type);
+
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* DTN_IPC_H */