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diff --git a/src/server/io.h b/src/server/io.h
index 78cb068..ad1344f 100644
--- a/src/server/io.h
+++ b/src/server/io.h
@@ -1,18 +1,39 @@
 /* io.h:
  *
- * Communication of the server with the outside world via input fifo and output
- * file.
+ * Communication of the server with the outside world and its client via input,
+ * output and world state files.
  */
 
 #ifndef IO_H
 #define IO_H
 
+#include <stddef.h> /* size_t */
+#include <stdint.h> /* uint8_t, uint32_t */
+#include <stdio.h> /* FILE */
+#include "cleanup.h" /* enum cleanup_flag */
 
 
+
+/* Wrapper to reading in config files from "path" for DB entries of "size
+ * starting at "entry_start", to be unset by "cleanup" and reading in individual
+ * entry data line by line via "read"(). Assumes all entries start with the
+ * items collected in the EntrySkeleton struct.
+ */
+struct EntrySkeleton
+{
+    uint8_t id;
+    struct EntrySkeleton * next;
+};
+extern void read_config_file(char * path, enum cleanup_flag cleanup,
+                             void (* read) (char *, uint32_t, char *,
+                                            struct EntrySkeleton *, FILE *),
+                             size_t size, struct EntrySkeleton ** entry_start);
+
 /* Return single \0-terminated string read from input queue (world.queue); or,
  * if queue is empty and world.turn is unequal world.last_update_turn, update
- * output file at world.path_out (and update world.last_update_turn), then read
- * file at world.path_in for the next load of bytes to put onto the input queue.
+ * world state file at world.path_worldstate (and update world.last_update_turn
+ * and write a single dot line to output file at world.path_out), then read file
+ * at world.path_in for the next load of bytes to put onto the input queue.
  *
  * Reading the file at world.path_in may put many \0-terminated strings on the
  * queue at once. Successive calls of io_round() will make these available one