error_check.rb in 0mq-0.5.3

- old
+ new

@@ -1,8 +1,35 @@
 
 module ZMQ
   
+  # "Native 0MQ error codes"
+  # Each is defined in zmq.h and is not a standard errno code
+  # Description for each error code is paraphrased from the zmq man pages
+  {
+    :EFSM           => "Finite state machine is in the wrong state",
+    :ENOCOMPATPROTO => "The requested protocol is not compatible",
+    :ETERM          => "The context was terminated",
+    :EMTHREAD       => "No I/O thread is available to accomplish the task",
+  }.each do |name, message|
+    klass = Class.new SystemCallError do
+      define_singleton_method :exception do |*args|
+        superclass.superclass.singleton_class
+        .instance_method(:new).bind(self).call(*args).tap { |exc|
+          exc.define_singleton_method(:message) { message }
+          exc.define_singleton_method(:to_s)    { message }
+          exc.define_singleton_method(:inspect) { 
+            "#<Errno::#{name}: #{message}>"
+          }
+        }
+      end
+    end
+    
+    klass.const_set :Errno, ZMQ.const_get(name)
+    Errno.const_set name, klass
+  end
+  
+  
   # A hash of error number => exception class.
   # Example: 1 => Errno::EPERM
   @error_map = Hash.new
   
   Errno.constants
@@ -14,16 +41,15 @@
   # Checks the libzmq global error number and raises it as an exception.
   # Should be used after calling a libzmq resource that returns -1 on error.
   # Example: ZMQ.error_check if rc == -1
   def self.error_check(adjust_backtrace=false)
     errno = LibZMQ.zmq_errno
-    return true if errno == 25 # TODO: What is this for? Remove?
     
     backtrace = adjust_backtrace ? caller[0...-2] : caller
     if @error_map.has_key? errno
       raise @error_map[errno], '', backtrace
     else
       raise SystemCallError, errno.to_s, backtrace
     end
   end
   
-end
\ No newline at end of file
+end