* 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

ChangeLog

@@ -1,3 +1,9 @@
+Tue Jul  6 08:35:58 2010  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* 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]
+
 Tue Jul  6 00:34:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* vm.c (thread_free): free altstack to prevent memory leak.  a patch

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

test/dl/test_import.rb

@@ -41,6 +41,15 @@ module DL
   end
 
   class TestImport < TestBase
+    def test_ensure_call_dlload
+      err = assert_raises(RuntimeError) do
+        Class.new do
+          extend DL::Importer
+          extern "void *strcpy(char*, char*)"
+        end
+      end
+    end
+
     def test_malloc()
       s1 = LIBC::Timeval.malloc()
       s2 = LIBC::Timeval.malloc()