text: /* Fetch the host's network interface list.  Hurd version.
     Copyright (C) 2002-2016 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;
      }
  
  }
  