+ intptr_t *argcptr;
+ vm_address_t addr;
+
+ /* Attempt to map page zero redzoned before we receive any RPC
+ data that might get allocated there. We can ignore errors. */
+ addr = 0;
+ __vm_map (__mach_task_self (),
+ &addr, __vm_page_size, 0, 0, MACH_PORT_NULL, 0, 1,
+ VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);