diff --git a/ChangeLog b/ChangeLog
index 37eb806936..e751e86021 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr 15 19:53:08 2004  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* process.c (pst_success_p): new method Process::Status#success?.
+	  [ruby-dev:23385]
+
 Thu Apr 15 19:26:54  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
 
 	* dir.c (rb_push_glob): Dir.glob() should return nil if block is given.
diff --git a/process.c b/process.c
index d252c0fa89..4c15e67a2a 100644
--- a/process.c
+++ b/process.c
@@ -511,7 +511,27 @@ pst_wexitstatus(st)
 
 /*
  *  call-seq:
- *     stat.coredump   => true or false
+ *     stat.success?   => true, false or nil
+ *  
+ *  Returns +true+ if _stat_ is successful, +false+ if not.
+ *  Returns +nil+ if <code>exited?</code> is not +true+.
+ */
+
+static VALUE
+pst_success_p(st)
+    VALUE st;
+{
+    int status = NUM2INT(st);
+
+    if (!WIFEXITED(status))
+	return Qnil;
+    return WEXITSTATUS(status) == EXIT_SUCCESS ? Qtrue : Qfalse;
+}
+
+
+/*
+ *  call-seq:
+ *     stat.coredump?   => true or false
  *  
  *  Returns +true+ if _stat_ generated a coredump
  *  when it terminated. Not available on all platforms.