sysdeps/mach/hurd/ifreq.c

   1 /* Fetch the host's network interface list.  Hurd version.
   2    Copyright (C) 2002,2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <ifreq.h>
  21 #include <hurd.h>
  22 #include <hurd/pfinet.h>
  23 #include <sys/mman.h>
  24
  25
  26 void
  27 __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
  28 {
  29   file_t server;
  30
  31   server = _hurd_socket_server (PF_INET, 0);
  32   if (server == MACH_PORT_NULL)
  33     {
  34     out:
  35       *num_ifs = 0;
  36       *ifreqs = NULL;
  37     }
  38   else
  39     {
  40       char *data = NULL;
  41       size_t len = 0;
  42       error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
  43       if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
  44         {
  45           /* On the first use of the socket server during the operation,
  46              allow for the old server port dying.  */
  47           server = _hurd_socket_server (PF_INET, 1);
  48           if (server == MACH_PORT_NULL)
  49             goto out;
  50           err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len);
  51         }
  52       if (err)
  53         goto out;
  54
  55       if (len % sizeof (struct ifreq) != 0)
  56         {
  57           munmap (data, len);
  58           errno = EGRATUITOUS;
  59           goto out;
  60         }
  61       *num_ifs = len / sizeof (struct ifreq);
  62       *ifreqs = (struct ifreq *) data;
  63     }
  64
  65 }