Add Process.argv0.

* ruby.c (Process.argv0): New method to return the original value
  of $0. [Feature #8696]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 3 deletions

diff --git a/ruby.c b/ruby.c
index 6c9061ca79..d93f5fdb4c 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1205,7 +1205,8 @@ opt_enc_index(VALUE enc_name)
     return i;
 }
 
-#define rb_progname (GET_VM()->progname)
+#define rb_progname      (GET_VM()->progname)
+#define rb_orig_progname (GET_VM()->orig_progname)
 VALUE rb_argv0;
 
 static VALUE
@@ -1834,7 +1835,7 @@ void
 ruby_script(const char *name)
 {
     if (name) {
-	rb_progname = rb_external_str_new(name, strlen(name));
+	rb_orig_progname = rb_progname = rb_external_str_new(name, strlen(name));
 	rb_vm_set_progname(rb_progname);
     }
 }
@@ -1846,7 +1847,7 @@ ruby_script(const char *name)
 void
 ruby_set_script_name(VALUE name)
 {
-    rb_progname = rb_str_dup(name);
+    rb_orig_progname = rb_progname = rb_str_dup(name);
     rb_vm_set_progname(rb_progname);
 }
 
@@ -1914,6 +1915,7 @@ ruby_prog_init(void)
     rb_define_hooked_variable("$0", &rb_progname, 0, set_arg0);
     rb_define_hooked_variable("$PROGRAM_NAME", &rb_progname, 0, set_arg0);
 
+    rb_define_module_function(rb_mProcess, "argv0", proc_argv0, 0);
     rb_define_module_function(rb_mProcess, "setproctitle", proc_setproctitle, 1);
 
     /*