add new mrbgem mruby-exit

mrbgems/mruby-exit/mrbgem.rake

@@ -0,0 +1,4 @@
+MRuby::Gem::Specification.new('mruby-exit') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+end

mrbgems/mruby-exit/src/mruby-exit.c

@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include "mruby.h"
+
+static mrb_value
+f_exit(mrb_state *mrb, mrb_value self)
+{
+  mrb_int i = EXIT_SUCCESS;
+
+  mrb_get_args(mrb, "|i", &i);
+  exit(i);
+  /* not reached */
+  return mrb_nil_value();
+}
+
+void
+mrb_mruby_exit_gem_init(mrb_state* mrb)
+{
+  mrb_define_method(mrb, mrb->kernel_module, "exit", f_exit, MRB_ARGS_REQ(1));
+}
+
+void
+mrb_mruby_exit_gem_final(mrb_state* mrb)
+{
+}