diff -Nru collectd-2.1.0-orig/src/collectd.c collectd-2.1.0/src/collectd.c
--- collectd-2.1.0-orig/src/collectd.c	2005-09-15 22:35:14.000000000 +0200
+++ collectd-2.1.0/src/collectd.c	2005-09-24 10:34:13.000000000 +0200
@@ -16,6 +16,9 @@
 kstat_ctl_t *kc;
 #endif /* HAVE_LIBKSTAT */
 
+#define PID_PATH	"/var/run/collectd.pid"
+
+
 void sigIntHandler (int signal)
 {
 	loop++;
@@ -166,6 +169,27 @@
 	exit (0);
 }
 
+static int create_pidfile (void)
+{
+	FILE *fh = fopen (PID_PATH, "w");
+	
+	if (!fh)
+	{
+		syslog (LOG_ERR, "fopen (pidfile): %s", strerror (errno));
+		return 1;
+	}
+	
+	fprintf(fh, "%d\n", getpid());
+	fclose(fh);
+	
+	return 0;
+}
+
+static int remove_pidfile (void)
+{
+	return unlink (PID_PATH);
+}
+
 int main (int argc, char **argv)
 {
 	int sleepingtime;
@@ -253,6 +277,9 @@
 	}
 #endif
 
+	if (create_pidfile ())
+		exit (2);
+
 	/* child */
 	while (loop == 0)
 	{
@@ -304,6 +331,8 @@
 
 	/* close syslog */
 	closelog ();
+	
+	remove_pidfile();
 
 	return (0);
 }