dlfcn/tstatexit.c

   1 /* Copyright (C) 2001-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <dlfcn.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22
  23 int
  24 main (void)
  25 {
  26   const char fname[] = "modatexit.so";
  27   void *h;
  28   void (*fp) (void *);
  29   int v = 0;
  30
  31   h = dlopen (fname, RTLD_NOW);
  32   if (h == NULL)
  33     {
  34       printf ("cannot open \"%s\": %s\n", fname, dlerror ());
  35       exit (1);
  36     }
  37
  38   fp = dlsym (h, "foo");
  39   if (fp == NULL)
  40     {
  41       printf ("cannot find \"foo\": %s\n", dlerror ());
  42       exit (1);
  43     }
  44
  45   fp (&v);
  46
  47   if (dlclose (h) != 0)
  48     {
  49       printf ("cannot close \"%s\": %s\n", fname, dlerror ());
  50       exit (1);
  51     }
  52
  53   if (v != 1)
  54     {
  55       puts ("module unload didn't change `v'");
  56       exit (1);
  57     }
  58
  59   puts ("finishing now");
  60
  61   return 0;
  62 }