sysdeps/unix/sysv/linux/dl-librecon.h

   1 /* Optional code to distinguish library flavours.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _DL_LIBRECON_H
  22 #define _DL_LIBRECON_H  1
  23
  24 /* Recognizing extra environment variables.  */
  25 #define EXTRA_LD_ENVVARS \
  26   case 13:                                                                    \
  27     if (memcmp (envline, "ASSUME_KERNEL", 13) == 0)                           \
  28       {                                                                       \
  29         unsigned long int i, j, osversion = 0;                                \
  30         char *p = &envline[14], *q;                                           \
  31                                                                               \
  32         for (i = 0; i < 3; i++, p = q + 1)                                    \
  33           {                                                                   \
  34             j = __strtoul_internal (p, &q, 0, 0);                             \
  35             if (j >= 255 || p == q || (i < 2 && *q && *q != '.'))             \
  36               {                                                               \
  37                 osversion = 0;                                                \
  38                 break;                                                        \
  39               }                                                               \
  40             osversion |= j << (16 - 8 * i);                                   \
  41             if (!*q)                                                          \
  42               break;                                                          \
  43           }                                                                   \
  44         if (osversion)                                                        \
  45           GL(dl_osversion) = osversion;                                       \
  46         break;                                                                \
  47       }
  48
  49 #endif /* dl-librecon.h */