new file mode 100644
--- /dev/null
+++ b/src/core/ngx_connection.h
@@ -0,0 +1,54 @@
+#ifndef _NGX_CONNECTION_H_INCLUDED_
+#define _NGX_CONNECTION_H_INCLUDED_
+
+#include <ngx_log.h>
+#include <ngx_alloc.h>
+#include <ngx_server.h>
+
+typedef struct ngx_connection_s  ngx_connection_t;
+
+#ifdef NGX_EVENT
+#include <ngx_event.h>
+#endif
+
+struct ngx_connection_s {
+    ngx_socket_t      fd;
+    void            *data;
+
+#ifdef NGX_EVENT
+    ngx_event_t      *read;
+    ngx_event_t      *write;
+#endif
+
+    ngx_log_t        *log;
+    ngx_server_t     *server;
+    ngx_server_t     *servers;
+    ngx_pool_t       *pool;
+};
+
+
+/*
+
+cached file
+    int      fd;       -2 unused, -1 closed (but read or mmaped), >=0 open
+    char    *name;
+
+    void    *buf;      addr if read or mmaped
+                       aiocb* if aio_read
+                       OVERLAPPED if TransmitFile or TransmitPackets
+                       NULL if sendfile
+
+    size_t   buf_size; for plain read
+    off_t    offset;   for plain read
+
+    size_t   size;
+    time_t   mod;
+    char    *last_mod; 'Sun, 17 Mar 2002 19:39:50 GMT'
+    char    *etag;     '"a6d08-1302-3c94f106"'
+    char    *len;      '4866'
+
+EV_VNODE        should notify by some signal if diretory tree is changed
+                or stat if aged >= N seconds (big enough)
+*/
+
+#endif /* _NGX_CONNECTION_H_INCLUDED_ */