Adding file descriptor to pass to the `send` functions.

src/ipc/context.cr

@@ -110,8 +110,8 @@ class IPC::Context
 		send(fd, utype, Bytes.new(payload.to_unsafe, payload.bytesize))
 	end
 
-	def send(message : IPC::Message)
-		send(message.fd, message.utype, message.payload)
+	def send(fd : Int32, message : IPC::Message)
+		send(fd : Int32, message.fd, message.utype, message.payload)
 	end
 
 	def read(index : UInt32)

src/json.cr

@@ -26,8 +26,8 @@ class IPC::JSON
 end
 
 class IPC::Context
-	def send(message : IPC::JSON)
-		send message.type.to_u8, message.to_json
+	def send(fd : Int32, message : IPC::JSON)
+		send fd : Int32, message.type.to_u8, message.to_json
 	end
 end