diff --git a/lib/roken/write_pid.c b/lib/roken/write_pid.c
new file mode 100644
index 000000000..acb1eadf3
--- /dev/null
+++ b/lib/roken/write_pid.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 1999 - 2000 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <roken.h>
+
+char *
+pid_file_write (const char *progname)
+{
+    FILE *fp;
+    char *ret;
+
+    asprintf (&ret, _PATH_VARRUN "%s.pid", progname);
+    if (ret == NULL)
+	return NULL;
+    fp = fopen (ret, "w");
+    if (fp == NULL) {
+	free (ret);
+	return NULL;
+    }
+    fprintf (fp, "%u", (unsigned)getpid());
+    fclose (fp);
+    return ret;
+}
+
+void
+pid_file_delete (char **filename)
+{
+    if (*filename != NULL) {
+	unlink (*filename);
+	free (*filename);
+	*filename = NULL;
+    }
+}