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
23int
24main (void)
25{
26 const char fname[] = "modatexit.so";
27 void *h;
28 void (*fp) (void *);
29 int v = 0;
30
31 h = dlopen (file: fname, RTLD_NOW);
32 if (h == NULL)
33 {
34 printf (format: "cannot open \"%s\": %s\n", fname, dlerror ());
35 exit (1);
36 }
37
38 fp = dlsym (handle: h, name: "foo");
39 if (fp == NULL)
40 {
41 printf (format: "cannot find \"foo\": %s\n", dlerror ());
42 exit (1);
43 }
44
45 fp (&v);
46
47 if (dlclose (handle: h) != 0)
48 {
49 printf (format: "cannot close \"%s\": %s\n", fname, dlerror ());
50 exit (1);
51 }
52
53 if (v != 1)
54 {
55 puts (s: "module unload didn't change `v'");
56 exit (1);
57 }
58
59 puts (s: "finishing now");
60
61 return 0;
62}
63

source code of glibc/dlfcn/tstatexit.c