elf/tst-dlclose-lazy-mod1.c

   1 /* Lazy binding during dlclose.  Directly loaded module.
   2    Copyright (C) 2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 /* This function is called from exported_function below.  It is only
  20    defined in this module.  The weak attribute mimics how G++
  21    implements vague linkage for C++.  */
  22 void __attribute__ ((weak))
  23 lazily_bound_exported_function (void)
  24 {
  25 }
  26
  27 /* Called from tst-dlclose-lazy-mod2.so.  */
  28 void
  29 exported_function (int call_it)
  30 {
  31   if (call_it)
  32     /* Previous to the fix this would crash when called during dlclose
  33        since symbols from the DSO were no longer available for binding
  34        (bug 30425) after the DSO started being closed by dlclose.  */
  35     lazily_bound_exported_function ();
  36 }