diff --git a/lib/daemon.c b/lib/daemon.c
new file mode 100644
index 0000000..dfd26b3
--- /dev/null
+++ b/lib/daemon.c
@@ -0,0 +1,80 @@
+/*
+ * Daemonize routine
+ * Copyright (C) 1997, 1999 Kunihiro Ishiguro
+ * 
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <zebra.h>
+
+#ifndef HAVE_DAEMON
+
+/* Daemonize myself. */
+int
+daemon (int nochdir, int noclose)
+{
+  pid_t pid;
+
+  pid = fork ();
+
+  /* In case of fork is error. */
+  if (pid < 0)
+    {
+      perror ("fork");
+      return -1;
+    }
+
+  /* In case of this is parent process. */
+  if (pid != 0)
+    exit (0);
+
+  /* Become session leader and get pid. */
+  pid = setsid();
+
+  if (pid < -1)
+    {
+      perror ("setsid");
+      return -1;
+    }
+
+  /* Change directory to root. */
+  if (! nochdir)
+    chdir ("/");
+
+  /* File descriptor close. */
+  if (! noclose)
+    {
+      int fd;
+
+      fd = open ("/dev/null", O_RDWR, 0);
+      if (fd != -1)
+	{
+	  dup2 (fd, STDIN_FILENO);
+	  dup2 (fd, STDOUT_FILENO);
+	  dup2 (fd, STDERR_FILENO);
+	  if (fd > 2)
+	    close (fd);
+	}
+    }
+
+  umask (0027);
+
+  return 0;
+}
+
+#endif /* HAVE_DAEMON */