/* Fetch the host's network interface list.  Hurd version.

   Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <ifreq.h>

#include <hurd.h>

#include <hurd/pfinet.h>

#include <sys/mman.h>

void

__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)

{

  file_t server;

  server = _hurd_socket_server (PF_INET, 0);

  if (server == MACH_PORT_NULL)

    {

    out:

      *num_ifs = 0;

      *ifreqs = NULL;

    }

  else

    {

      char *data = NULL;

      size_t len = 0;

      error_t err = __pfinet_siocgifconf (server, -1, &data, &len;;

      if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)

	{

	  /* On the first use of the socket server during the operation,

	     allow for the old server port dying.  */

	  server = _hurd_socket_server (PF_INET, 1);

	  if (server == MACH_PORT_NULL)

	    goto out;

	  err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len;;

	}

      if (err)

	goto out;

      if (len % sizeof (struct ifreq) != 0)

	{

	  __munmap (data, len);

	  errno = EGRATUITOUS;

	  goto out;

	}

      *num_ifs = len / sizeof (struct ifreq);

      *ifreqs = (struct ifreq *) data;

    }

}