sysdeps/nacl/nacl_interface_query.c

   1 /* NaCl function exposing IRT interface query.
   2    Copyright (C) 2015-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <nacl-interfaces.h>
  20 #include <ldsodefs.h>
  21
  22 #ifdef SHARED
  23
  24 /* We can define this trivially using IFUNC rather than a wrapper
  25    because we absolutely require that we get the IRT interface query
  26    function pointer via AT_SYSINFO.  */
  27
  28 extern TYPE_nacl_irt_query nacl_interface_query_ifunc (void)
  29   asm ("nacl_interface_query");
  30
  31 TYPE_nacl_irt_query
  32 nacl_interface_query_ifunc (void)
  33 {
  34   return &__nacl_irt_query;
  35 }
  36 asm (".type nacl_interface_query, %gnu_indirect_function");
  37
  38 #else
  39
  40 /* In the static library, using IFUNC is just extra overhead.  */
  41
  42 size_t
  43 nacl_interface_query (const char *interface_ident,
  44                       void *table, size_t tablesize)
  45 {
  46   return __nacl_irt_query (interface_ident, table, tablesize);
  47 }
  48
  49 #endif