2 files changed, 18 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index d5474793aa..975dd5554e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Aug 27 12:25:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* io.c (null_device): the name of null device.  [ruby-dev:41791]
+
 Fri Aug 27 07:57:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* array.c (rb_ary_shuffle_bang): bail out from modification during
diff --git a/io.c b/io.c
index 459528255e..ea6b2a2f23 100644
--- a/io.c
+++ b/io.c
@@ -9639,6 +9639,18 @@ rb_get_argv(void)
     return ARGF.argv;
 }
 
+static const char null_device[] =
+#if defined DOSISH
+    "NUL"
+#elif defined AMIGA || defined __amigaos__
+    "NIL"
+#elif defined __VMS
+    "NL:"
+#else
+    "/dev/null"
+#endif
+    ;
+
 /*
  * Document-class: IOError
  *
@@ -9972,6 +9984,8 @@ Init_IO(void)
     rb_define_method(rb_cIO, "autoclose?", rb_io_autoclose_p, 0);
     rb_define_method(rb_cIO, "autoclose=", rb_io_set_autoclose, 1);
 
+    rb_define_const(rb_cIO, "NULL", rb_obj_freeze(rb_usascii_str_new2(null_device)));
+
     rb_define_variable("$stdin", &rb_stdin);
     rb_stdin = prep_stdio(stdin, FMODE_READABLE, rb_cIO, "<STDIN>");
     rb_define_hooked_variable("$stdout", &rb_stdout, 0, stdout_setter);