gdb/testsuite/gdb.threads/dlopen-libpthread.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2011-2018 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <dlfcn.h>
  19 #include <stddef.h>
  20 #include <assert.h>
  21
  22 static const char *volatile filename;
  23
  24 static void
  25 notify (void)
  26 {
  27   filename = NULL; /* notify-here */
  28 }
  29
  30 int
  31 main (void)
  32 {
  33   void *h;
  34   void (*fp) (void (*) (void));
  35
  36   assert (filename != NULL);
  37   h = dlopen (filename, RTLD_LAZY);
  38   assert (h != NULL);
  39
  40   fp = dlsym (h, "f");
  41   assert (fp != NULL);
  42
  43   fp (notify);
  44
  45   return 0;
  46 }