argcptr = __alloca (sizeof (int) +
argcptr = __alloca (sizeof (intptr_t) +
_hurd_startup (void **argptr, void (*main) (int *data)){  error_t err;  mach_port_t in_bootstrap;  char *args, *env;  mach_msg_type_number_t argslen, envlen;  struct hurd_startup_data data;  char **argv, **envp;  int argc, envc;  int *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);  if (err = __task_get_special_port (__mach_task_self (), TASK_BOOTSTRAP_PORT,				     &in_bootstrap))    LOSE;  if (in_bootstrap != MACH_PORT_NULL)    {      /* Call the exec server on our bootstrap port and	 get all our standard information from it.  */      argslen = envlen = 0;      data.dtablesize = data.portarraysize = data.intarraysize = 0;      err = __exec_startup_get_info (in_bootstrap,				     &data.user_entry,				     &data.phdr, &data.phdrsz,				     &data.stack_base, &data.stack_size,				     &data.flags,				     &args, &argslen,				     &env, &envlen,				     &data.dtable, &data.dtablesize,				     &data.portarray, &data.portarraysize,				     &data.intarray, &data.intarraysize);      __mach_port_deallocate (__mach_task_self (), in_bootstrap);    }  if (err || in_bootstrap == MACH_PORT_NULL || (data.flags & EXEC_STACK_ARGS))    {      /* Either we have no bootstrap port, or the RPC to the exec server	 failed, or whoever started us up passed the flag saying args are	 on the stack.  Try to snarf the args in the canonical Mach way.	 Hopefully either they will be on the stack as expected, or the	 stack will be zeros so we don't crash.  */      argcptr = (int *) argptr;      argc = argcptr[0];      argv = (char **) &argcptr[1];      envp = &argv[argc + 1];      envc = 0;      while (envp[envc])	++envc;    }  else    {      /* Turn the block of null-separated strings we were passed for the	 arguments and environment into vectors of pointers to strings.  */      /* Count up the arguments so we can allocate ARGV.  */      argc = __argz_count (args, argslen);      /* Count up the environment variables so we can allocate ENVP.  */      envc = __argz_count (env, envlen);      /* There were some arguments.  Allocate space for the vectors of	 pointers and fill them in.  We allocate the space for the	 environment pointers immediately after the argv pointers because	 the ELF ABI will expect it.  */      argcptr = __alloca (sizeof (int) +			  (argc + 1 + envc + 1) * sizeof (char *) +			  sizeof (struct hurd_startup_data));      *argcptr = argc;      argv = (void *) (argcptr + 1);      __argz_extract (args, argslen, argv);      /* There was some environment.  */      envp = &argv[argc + 1];      __argz_extract (env, envlen, envp);    }  if (err || in_bootstrap == MACH_PORT_NULL)    {      /* Either we have no bootstrap port, or the RPC to the exec server	 failed.  Set all our other variables to have empty information.  */      data.flags = 0;      args = env = NULL;      argslen = envlen = 0;      data.dtable = NULL;      data.dtablesize = 0;      data.portarray = NULL;      data.portarraysize = 0;      data.intarray = NULL;      data.intarraysize = 0;    }  else if ((void *) &envp[envc + 1] == argv[0])    {      /* The arguments arrived on the stack from the kernel, but our	 protocol requires some space after them for a `struct	 hurd_startup_data'.  Move them.  */      struct	{	  int count;	  char *argv[argc + 1];	  char *envp[envc + 1];	  struct hurd_startup_data data;	} *args = alloca (sizeof *args);      if ((void *) &args[1] == (void *) argcptr)	args = alloca (-((char *) &args->data - (char *) args));      memmove (args, argcptr, (char *) &args->data - (char *) args);      argcptr = (void *) args;      argv = args->argv;      envp = args->envp;    }  {    struct hurd_startup_data *d = (void *) &envp[envc + 1];    if ((void *) d != argv[0])      {	*d = data;	_hurd_init_dtable = d->dtable;	_hurd_init_dtablesize = d->dtablesize;      }    (*main) (argcptr);  }  /* Should never get here.  */  LOSE;  abort ();}