Moved websocket echo server example

examples/websocket_echo_server/websocket_echo_server.c

@@ -0,0 +1,61 @@
+// Copyright (c) 2013-2014 Cesanta Software Limited
+// $Date: 2014-09-09 08:27:35 UTC $
+
+#include <string.h>
+#include <time.h>
+#include "mongoose.h"
+
+static void push_message(struct mg_server *server, time_t current_time) {
+  struct mg_connection *c;
+  char buf[20];
+  int len = sprintf(buf, "%lu", (unsigned long) current_time);
+
+  // Iterate over all connections, and push current time message to websocket ones.
+  for (c = mg_next(server, NULL); c != NULL; c = mg_next(server, c)) {
+    if (c->is_websocket) {
+      mg_websocket_write(c, 1, buf, len);
+    }
+  }
+}
+
+static int send_reply(struct mg_connection *conn) {
+  if (conn->is_websocket) {
+    // This handler is called for each incoming websocket frame, one or more
+    // times for connection lifetime.
+    // Echo websocket data back to the client.
+    mg_websocket_write(conn, 1, conn->content, conn->content_len);
+    return conn->content_len == 4 && !memcmp(conn->content, "exit", 4) ?
+      MG_FALSE : MG_TRUE;
+  } else {
+    mg_send_file(conn, "index.html");
+    return MG_MORE;
+  }
+}
+
+static int ev_handler(struct mg_connection *conn, enum mg_event ev) {
+  switch (ev) {
+    case MG_AUTH: return MG_TRUE;
+    case MG_REQUEST: return send_reply(conn);
+    default: return MG_FALSE;
+  }
+}
+
+int main(void) {
+  struct mg_server *server = mg_create_server(NULL, ev_handler);
+  time_t current_timer = 0, last_timer = time(NULL);
+
+  mg_set_option(server, "listening_port", "8080");
+
+  printf("Started on port %s\n", mg_get_option(server, "listening_port"));
+  for (;;) {
+    mg_poll_server(server, 100);
+    current_timer = time(NULL);
+    if (current_timer - last_timer > 0) {
+      last_timer = current_timer;
+      push_message(server, current_timer);
+    }
+  }
+
+  mg_destroy_server(&server);
+  return 0;
+}