sysdeps/mach/hurd/ifreq.h

   1 /* Fetch the host's network interface list.  Hurd version.
   2    Copyright (C) 2002 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 <net/if.h>
  21 #include <hurd.h>
  22 #include <hurd/pfinet.h>
  23 #include <sys/socket.h>
  24 #include <sys/mman.h>
  25
  26
  27 static inline void
  28 __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
  29 {
  30   file_t server;
  31
  32   server = _hurd_socket_server (PF_INET, 0);
  33   if (server == MACH_PORT_NULL)
  34     {
  35     out:
  36       *num_ifs = 0;
  37       *ifreqs = NULL;
  38     }
  39   else
  40     {
  41       char *data = NULL;
  42       size_t len = 0;
  43       error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
  44       if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
  45         {
  46           /* On the first use of the socket server during the operation,
  47              allow for the old server port dying.  */
  48           server = _hurd_socket_server (PF_INET, 1);
  49           if (server == MACH_PORT_NULL)
  50             goto out;
  51           err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len);
  52         }
  53       if (err)
  54         goto out;
  55
  56       if (len % sizeof (struct ifreq) != 0)
  57         {
  58           munmap (data, len);
  59           errno = EGRATUITOUS;
  60           goto out;
  61         }
  62       *num_ifs = len / sizeof (struct ifreq);
  63       *ifreqs = (struct ifreq *) data;
  64     }
  65
  66 }
  67
  68
  69 static inline struct ifreq *
  70 __if_nextreq (struct ifreq *ifr)
  71 {
  72   return ifr + 1;
  73 }
  74
  75
  76 static inline void
  77 __if_freereq (struct ifreq *ifreqs, int num_ifs)
  78 {
  79   __munmap (ifreqs, num_ifs * sizeof (struct ifreq));
  80 }