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diff --git a/common/elapi/elapi_async.h b/common/elapi/elapi_async.h
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+++ b/common/elapi/elapi_async.h
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+/*
+    ELAPI
+
+    Header file for the ELAPI async processing interface.
+
+    Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef ELAPI_ASYNC_H
+#define ELAPI_ASYNC_H
+
+#include <sys/time.h>
+
+/* Signature ELAPI callback function that
+ * should be called when the event loop got an event on the
+ * socket or file descriptor.
+ * ELAPI will always try to write to sockets in async way
+ * if the sink has this capability.
+ * So this is the callback that will always be
+ * invoked when we get ACK from the process receiving events.
+ */
+typedef int (*elapi_fd_callback)(int fd,                /* File descriptor     */
+                                 void *elapi_data);     /* ELAPI supplied data */
+
+/* Signature ELAPI callback function that
+ * should be called when the event loop got a timer driven event.
+ */
+typedef int (*elapi_timer_callback)(void *elapi_data);  /* ELAPI supplied data */
+
+/* Signature of the supplied by caller function that ELAPI
+ * will call to add the fd into the application event processing loop.
+ */
+typedef int (*elapi_add_fd)(int fd,                     /* File descriptor to add */
+                            void *callers_data,         /* Data that the function
+                                                         * would need to do its work */
+                            elapi_fd_callback handle,   /* Callback to call when event happens */
+                            void *elapi_data);          /* Data to pass to the callback */
+
+/* Signature of the supplied by caller function that ELAPI
+ * will call to remove the fd from the application event processing loop.
+ * The implementation of the function should assume that
+ * ELAPI will close file/socket descriptor after colling this function.
+ */
+typedef int (*elapi_rem_fd)(int fd,                     /* File descriptor to add */
+                            void *callers_data);        /* Data that the function
+                                                         * would need to do its work */
+
+/* Signature of the supplied by caller function that ELAPI
+ * will call to add a new timer event to the application event processing loop.
+ */
+typedef int (*elapi_add_timer)(struct timeval timer,        /* Timer */
+                               void *callers_data,          /* Data that the function
+                                                             * would need to do its work */
+                               elapi_timer_callback handle, /* Callback to call when event happens */
+                               void *elapi_data);           /* Data to pass to the callback */
+
+
+
+
+
+#endif