diff --git a/shard.yml b/shard.yml
index 4f3a0fc..0a58fac 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: ipc
-version: 0.1.2
+version: 0.2.0
 
 authors:
   - Philippe Pittoli <karchnu@karchnu.fr>
@@ -15,6 +15,6 @@ dependencies:
     branch: master
 
 libraries:
-  libipc: ">= 0.1.2"
+  libipc: ">= 0.2.0"
 
 license: ISC
diff --git a/src/bindings.cr b/src/bindings.cr
index dea5128..7127fc5 100644
--- a/src/bindings.cr
+++ b/src/bindings.cr
@@ -15,7 +15,7 @@ lib LibIPC
   fun init = ipc_context_init(Void**) : LibC::Int
   fun deinit = ipc_context_deinit(Void**) : Void
 
-  fun service_init = ipc_service_init(Void*, LibC::Int*, LibC::Char*, LibC::UInt16T) : LibC::Int
+  fun service_init    = ipc_service_init(   Void*, LibC::Int*, LibC::Char*, LibC::UInt16T) : LibC::Int
   fun connect_service = ipc_connect_service(Void*, LibC::Int*, LibC::Char*, LibC::UInt16T) : LibC::Int
 
   # Context EventType index serverfd newclientfd buffer buflen
@@ -34,4 +34,18 @@ lib LibIPC
   fun close = ipc_close(Void*, LibC::UInt64T) : LibC::Int
   fun close_fd = ipc_close_fd(Void*, LibC::Int) : LibC::Int
   fun close_all = ipc_close_all(Void*) : LibC::Int
+
+  # Add a new external file descriptor.
+  # LibIPC won't automatically read the content.
+  fun external = ipc_add_external (Void*, LibC::Int) : LibC::Int
+
+  # Add a new switch (messages are automatically exchanged between these two file descriptors).
+  fun add_switch = ipc_add_switch (Void*, LibC::Int, LibC::Int) : LibC::Int
+
+  # Set IO callbacks for a file descriptor.
+  # Returned "char" is a cb_event_types enum.
+  # One of the callbacks can be "NULL" to keep the default callback, thus changing only input or output operations.
+  fun switch_callbacks = ipc_set_switch_callbacks (Void*, LibC::Int,
+    (LibC::Int, LibC::Char*, LibC::UInt64T* -> LibC::Char),
+    (LibC::Int, LibC::Char*, LibC::UInt64T  -> LibC::Char));
 end
diff --git a/src/high-level-bindings.cr b/src/high-level-bindings.cr
index 50aa65f..786fd13 100644
--- a/src/high-level-bindings.cr
+++ b/src/high-level-bindings.cr
@@ -108,6 +108,26 @@ class IPC
     end
   end
 
+  def external(fd : LibC::Int)
+    if LibIPC.external(@context, fd) != 0
+      raise "Oh noes, 'external' iz brkn"
+    end
+  end
+
+  def add_switch(fd1 : LibC::Int, fd2 : LibC::Int)
+    if LibIPC.add_switch(@context, fd1, fd2) != 0
+      raise "Oh noes, 'add_switch' iz brkn"
+    end
+  end
+
+  def switch_callbacks(fd : LibC::Int,
+                       fn_in  : (LibC::Int, LibC::Char*, LibC::UInt64T* -> LibC::Char),
+                       fn_out : (LibC::Int, LibC::Char*, LibC::UInt64T  -> LibC::Char))
+    if LibIPC.switch_callbacks(@context, fd, fn_in, fn_out) != 0
+      raise "Oh noes, 'switch_callbacks' iz brkn"
+    end
+  end
+
   def wait : IPC::Event
     eventtype : UInt8 = 0
     index : LibC::UInt64T = 0