IO.sysopen raises an exception when open(2) fails. closes #6.

mrblib/file.rb

@@ -14,20 +14,7 @@ class File < IO
       super(fd_or_path, mode)
     else
       @path = fd_or_path
-
-      perm = 0666  unless perm.is_a? Fixnum
       fd = IO.sysopen(@path, mode, perm)
-      if fd < 0 && Object.const_defined?(:Errno)
-        begin
-          Errno.handle @path
-        rescue Errno::EMFILE
-          GC.run(true)
-          fd = IO.sysopen(@path, mode, perm)
-          Errno.handle if fd < 0
-        end
-      elsif fd < 0
-        raise NoFileError.new "no such file or directory"
-      end
       super(fd, mode)
     end
   end

src/io.c

@@ -396,6 +396,8 @@ mrb_io_s_sysopen(mrb_state *mrb, mrb_value klass)
 
   flags = mrb_io_modestr_to_flags(mrb, mrb_string_value_cstr(mrb, &mode));
   fd = io_open(mrb, path, flags, perm);
+  if (fd == -1)
+    mrb_sys_fail(mrb, mrb_str_to_cstr(mrb, path));
 
   return mrb_fixnum_value(fd);
 }