Reorganise under Linux::

lib/linux/error.rb

@@ -0,0 +1,15 @@
+module Linux
+  ERRNO_MAP = {}  #:nodoc:
+  Errno.constants.each do |k|
+    klass = Errno.const_get(k)
+    next unless klass.is_a?(Class) and Class.const_defined?(:Errno)
+    ERRNO_MAP[klass::Errno] = klass
+  end
+
+  # Raise an Errno exception if the given rc is negative
+  def self.check_error(rc)
+    if rc < 0
+      raise ERRNO_MAP[-rc] || "System error #{-rc}"
+    end
+  end
+end