Diff: EMAC/uIP/apps/hello-world/hello-world.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EMAC/uIP/apps/hello-world/hello-world.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,100 @@
+/**
+ * \addtogroup helloworld
+ * @{
+ */
+
+/**
+ * \file
+ *         An example of how to write uIP applications
+ *         with protosockets.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+/*
+ * This is a short example of how to write uIP applications using
+ * protosockets.
+ */
+
+/*
+ * We define the application state (struct hello_world_state) in the
+ * hello-world.h file, so we need to include it here. We also include
+ * uip.h (since this cannot be included in hello-world.h) and
+ * <string.h>, since we use the memcpy() function in the code.
+ */
+#include "hello-world.h"
+#include "uip.h"
+#include <string.h>
+
+/*
+ * Declaration of the protosocket function that handles the connection
+ * (defined at the end of the code).
+ */
+static int handle_connection(struct hello_world_state *s);
+/*---------------------------------------------------------------------------*/
+/*
+ * The initialization function. We must explicitly call this function
+ * from the system initialization code, some time after uip_init() is
+ * called.
+ */
+void
+hello_world_init(void)
+{
+  /* We start to listen for connections on TCP port 1000. */
+  uip_listen(HTONS(1000));
+}
+/*---------------------------------------------------------------------------*/
+/*
+ * In hello-world.h we have defined the UIP_APPCALL macro to
+ * hello_world_appcall so that this funcion is uIP's application
+ * function. This function is called whenever an uIP event occurs
+ * (e.g. when a new connection is established, new data arrives, sent
+ * data is acknowledged, data needs to be retransmitted, etc.).
+ */
+void
+hello_world_appcall(void)
+{
+  /*
+   * The uip_conn structure has a field called "appstate" that holds
+   * the application state of the connection. We make a pointer to
+   * this to access it easier.
+   */
+  struct hello_world_state *s = &(uip_conn->appstate);
+
+  /*
+   * If a new connection was just established, we should initialize
+   * the protosocket in our applications' state structure.
+   */
+  if(uip_connected()) {
+    PSOCK_INIT(&s->p, s->inputbuffer, sizeof(s->inputbuffer));
+  }
+
+  /*
+   * Finally, we run the protosocket function that actually handles
+   * the communication. We pass it a pointer to the application state
+   * of the current connection.
+   */
+  handle_connection(s);
+}
+/*---------------------------------------------------------------------------*/
+/*
+ * This is the protosocket function that handles the communication. A
+ * protosocket function must always return an int, but must never
+ * explicitly return - all return statements are hidden in the PSOCK
+ * macros.
+ */
+static int
+handle_connection(struct hello_world_state *s)
+{
+  PSOCK_BEGIN(&s->p);
+
+  PSOCK_SEND_STR(&s->p, "Hello. What is your name?\n");
+  PSOCK_READTO(&s->p, '\n');
+  strncpy(s->name, s->inputbuffer, sizeof(s->name));
+  PSOCK_SEND_STR(&s->p, "Hello ");
+  PSOCK_SEND_STR(&s->p, s->name);
+  PSOCK_CLOSE(&s->p);
+  
+  PSOCK_END(&s->p);
+}
+/*---------------------------------------------------------------------------*/