--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tryflock.c	Fri Oct 19 14:06:22 2007 +0200
@@ -0,0 +1,8 @@
+#include <sys/types.h>
+#include <sys/file.h>
+#include <fcntl.h>
+
+void main()
+{
+  flock(0,LOCK_EX | LOCK_UN | LOCK_NB);
+}