FreeBSD and Linux AIO support
diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index 5395acd..993ce8f 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -287,4 +287,12 @@
 #define ngx_set_stderr_n         "dup2(STDERR_FILENO)"
 
 
+#if (NGX_HAVE_FILE_AIO)
+
+ssize_t ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size,
+    off_t offset, ngx_pool_t *pool);
+
+#endif
+
+
 #endif /* _NGX_FILES_H_INCLUDED_ */