diff --git a/src/iperf_api.h b/src/iperf_api.h
new file mode 100644
index 0000000..43427eb
--- /dev/null
+++ b/src/iperf_api.h
@@ -0,0 +1,144 @@
+typedef uint64_t iperf_size_t;
+
+struct iperf_interval_results
+{
+	iperf_size_t bytes_transferred;
+	int  interval_duration;
+	void * custom_data;
+};
+
+struct iperf_stream_result
+{
+        iperf_size_t  bytes_received;
+        iperf_size_t  bytes_sent;
+        int  duration;
+        struct iperf_interval_results *interval_results;
+        void *custom_data;
+};
+
+struct iperf_sock_opts
+{
+	int ttl;
+	int tos;
+};
+
+struct iperf_udp_settings
+{
+	int  rate;
+	int  packet_size;				// size of a packet/ MSS
+};
+
+struct iperf_tcp_settings
+{
+	int  window_size;				// TCP window size
+};
+
+struct iperf_settings
+{
+	struct iperf_sock_opts *options;		// structure to set socket options
+        struct *proto;                                  // protocol specific settings
+}
+
+struct iperf_stream
+{
+        /* configurable members */
+	int local_port;					// local port
+	int remote_port;				// remote machine port
+        void *settings;	                        	// pointer to structure settings  
+	int protocol;					// protocol- TCP/UDP	
+
+        /* non configurable members */
+	struct iperf_stream_result *result;		//structure pointer to result
+
+        int socket;                                     // socket 
+
+        struct sockaddr_storage local_addr;
+        struct sockaddr_storage remote_addr;
+
+        int *(*init)(struct iperf_stream *stream);
+        int *(*recv)(struct iperf_stream *stream);
+        int *(*send)(struct iperf_stream *stream);
+        int *(*update_stats)(struct iperf_stream *stream);
+
+        struct iperf_stream *next;
+};
+
+struct iperf_test
+{
+	char role;						// 'c'lient or 's'erver
+	struct sockaddr_storage *remote_ip_addr;
+	struct sockaddr_storage *local_ip_addr;	
+	int  duration;						// total duration of test
+
+	int  stats_interval;					// time interval to gather stats
+	void *(*stats_callback)(struct iperf_test *);		// callback function pointer for stats
+
+        int  reporter_interval;				        // time interval for reporter
+	void *(*reporter_callback)(struct iperf_test *);	// call back function pointer for reporter
+        int reporter_fd;			                // file descriptor for reporter
+
+        /* internal state */
+        
+	int  num_streams;					// total streams in the test
+	struct iperf_stream *streams;				// pointer to list of struct stream
+};
+
+/**
+ * iperf_create_test -- return a new iperf_test with default values
+ *
+ * returns NULL on failure
+ *
+ */
+struct iperf_test *iperf_create_test();
+
+/**
+ * iperf_init_test -- perform pretest initialization (listen on sockets, etc)
+ *
+ */
+void iperf_init_test(struct iperf_test *test);
+
+/**
+ * iperf_destroy_test -- free resources used by test, calls iperf_destroy_stream to
+ * free streams
+ *
+ */
+void iperf_destroy_test(struct iperf_test *test);
+
+
+/**
+ * iperf_create_stream -- return a net iperf_test with default values
+ *
+ * returns NULL on failure
+ *
+ */
+struct iperf_stream *iperf_create_stream();
+
+struct iperf_stream *iperf_create_tcp_stream(int window, struct iperf_sock_opts *sockopt);
+struct iperf_stream *iperf_create_udp_stream(int rate, int size, struct iperf_sock_opts *sockopt);
+
+/**
+ * iperf_add_stream -- add a stream to a test
+ *
+ * returns 1 on success 0 on failure
+ */
+int iperf_add_stream(struct iperf_test *test, struct iperf_stream *stream);
+
+/**
+ * iperf_init_stream -- init resources associated with test
+ *
+ */
+void iperf_init_stream(struct iperf_stream *stream);
+
+/**
+ * iperf_destroy_stream -- free resources associated with test
+ *
+ */
+void iperf_destroy_stream(struct iperf_stream *stream);
+
+
+/**
+ * iperf_run -- run iperf
+ *
+ * returns an exit status
+ */
+int iperf_run(struct iperf_test *test);