Added public files
Roughly added all public files. Probably missed some, though.
diff --git a/doc/hook/clean_up b/doc/hook/clean_up
new file mode 100644
index 0000000..e00521a
--- /dev/null
+++ b/doc/hook/clean_up
@@ -0,0 +1,45 @@
+SYNOPSIS
+ #include <sys/driver_hooks.h>
+
+ set_driver_hook(H_CLEAN_UP, value)
+
+ <value> being:
+
+ int <closure>(int ref, object ob)
+ void|int <name>(int ref)
+
+DESCRIPTION
+ Optional hook to clean up an object.
+ Hook setting can be any closure, or the name of the function
+ to call in the object.
+
+ This hook is called for an object if it hasn't been used
+ for at least TIME_TO_CLEAN_UP seconds, to give it the
+ opportunity to self destruct.
+
+ If the hook is a closure, it is called with the refcount of
+ the object to clean up as first argument, and with the object
+ itself as second. Lambda closures are also bound to the object
+ prior to the call.
+
+ If the hook is the name of an lfun, it is called in the
+ object with its refcount as argument.
+
+ In both calls, the refcount is constructed as:
+
+ ref = 0: the object is a clone, or a blueprint with
+ replaced program.
+ ref = 1: the object is a swapped or unused blueprint.
+ ref > 1: the object is a used blueprint with <ref> references.
+
+ The cleanup method has the possibility to destruct the
+ object. To survive this time, but try again some time later,
+ the call has to result in a non-zero value.
+
+ If the hook specifies a non-existing lfun, or if the call
+ returns 0, no further attempt to clean up this object will be done.
+
+HISTORY
+
+SEE ALSO
+ hooks(C)