* ext/dl/lib/dl/import.rb (handler): add a more helpful error message

  when calling import_symbol or import_function without calling
  dlload.  Thanks nobu! [ruby-core:30996]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28552 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 2 deletions

diff --git a/ext/dl/lib/dl/import.rb b/ext/dl/lib/dl/import.rb
index fd23bc9676..f9e8faf5f0 100644
--- a/ext/dl/lib/dl/import.rb
+++ b/ext/dl/lib/dl/import.rb
@@ -194,8 +194,12 @@ module DL
       return ptr
     end
 
+    def handler
+      @handler or raise "call dlload before importing symbols and functions"
+    end
+
     def import_symbol(name)
-      addr = @handler.sym(name)
+      addr = handler.sym(name)
       if( !addr )
         raise(DLError, "cannot find the symbol: #{name}")
       end
@@ -203,7 +207,7 @@ module DL
     end
 
     def import_function(name, ctype, argtype, call_type = nil)
-      addr = @handler.sym(name)
+      addr = handler.sym(name)
       if( !addr )
         raise(DLError, "cannot find the function: #{name}()")
       end