From 9e6fd9976915dbcf102b61be5925e3596a83566f Mon Sep 17 00:00:00 2001
From: Philippe PITTOLI <p.pittoli@unistra.fr>
Date: Wed, 5 Jun 2019 22:20:21 +0200
Subject: [PATCH 1/3] Set some functions public.

---
 src/ipc.cr | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ipc.cr b/src/ipc.cr
index 955c2ab..3fe6d65 100644
--- a/src/ipc.cr
+++ b/src/ipc.cr
@@ -190,8 +190,8 @@ class IPC::Event
 end
 
 class IPC::Connection
-	@closed = false
-	@connection : LibIPC::Connection
+	getter connection : LibIPC::Connection
+	getter closed = false
 
 	# connection already established
 	def initialize(c : LibIPC::Connection)

From ba2d8befbfb6b980764028e0dbf32faf145476a4 Mon Sep 17 00:00:00 2001
From: Philippe PITTOLI <p.pittoli@unistra.fr>
Date: Wed, 5 Jun 2019 22:24:40 +0200
Subject: [PATCH 2/3] Language.

---
 src/ipc.cr | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ipc.cr b/src/ipc.cr
index 3fe6d65..3714420 100644
--- a/src/ipc.cr
+++ b/src/ipc.cr
@@ -250,7 +250,7 @@ class IPC::Connection
 		r = LibIPC.ipc_close(pointerof(@connection))
 		if r != 0
 			m = String.new LibIPC.ipc_errors_get (r)
-			raise Exception.new "cannot close correctly the connection: #{m}"
+			raise Exception.new "cannot correctly close the connection: #{m}"
 		end
 
 		@closed = true

From d65083e92e373692aa57fc913cbfae5d43d7ab63 Mon Sep 17 00:00:00 2001
From: Philippe PITTOLI <p.pittoli@unistra.fr>
Date: Wed, 5 Jun 2019 22:25:02 +0200
Subject: [PATCH 3/3] Functions for low-level manipulation.

---
 src/ipc.cr | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/src/ipc.cr b/src/ipc.cr
index 3714420..231297d 100644
--- a/src/ipc.cr
+++ b/src/ipc.cr
@@ -281,7 +281,16 @@ class IPC::Service
 		close
 	end
 
-	def add_file_descriptor (fd : Int)
+	def << (connection : IPC::Connection)
+		c = connection.connection
+		r = LibIPC.ipc_add(pointerof(@connections), pointerof(c))
+		if r != 0
+			m = String.new LibIPC.ipc_errors_get (r)
+			raise Exception.new "cannot add an arbitrary file descriptor: #{m}"
+		end
+	end
+
+	def << (fd : Int)
 		r = LibIPC.ipc_add_fd(pointerof(@connections), fd)
 		if r != 0
 			m = String.new LibIPC.ipc_errors_get (r)
@@ -289,14 +298,13 @@ class IPC::Service
 		end
 	end
 
-	# TODO: not implemented in libipc, yet.
-	# def del_file_descriptor (fd : Int)
-	# 	r = LibIPC.ipc_del_fd(pointerof(@connections), fd)
-	# 	if r != 0
-	# 		m = String.new LibIPC.ipc_errors_get (r)
-	# 		raise Exception.new "cannot remove an arbitrary file descriptor: #{m}"
-	# 	end
-	# end
+	def remove_fd (fd : Int)
+		r = LibIPC.ipc_del_fd(pointerof(@connections), fd)
+		if r != 0
+			m = String.new LibIPC.ipc_errors_get (r)
+			raise Exception.new "cannot remove an arbitrary file descriptor: #{m}"
+		end
+	end
 
 	def close
 		return if @closed