+#if VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0
+u32
+vlib_buffer_alloc_may_fail (vlib_main_t * vm, u32 n_buffers)
+{
+ f64 r;
+
+ r = random_f64 (&vm->buffer_alloc_success_seed);
+
+ /* Fail this request? */
+ if (r > vm->buffer_alloc_success_rate)
+ n_buffers--;
+ /* 5% chance of returning nothing at all */
+ if (r > vm->buffer_alloc_success_rate && r > 0.95)
+ n_buffers = 0;
+
+ return n_buffers;
+}
+#endif