aboutsummaryrefslogtreecommitdiff
path: root/elf/unload2.c
blob: b544e794c89abb33e2afbdd6436542f00c053f2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
#include <dlfcn.h>
#include <elf.h>
#include <errno.h>
#include <error.h>
#include <link.h>
#include <stdio.h>
#include <stdlib.h>

#define OUT \
  for (map = _r_debug.r_map; map != NULL; map = map->l_next)		      \
    if (map->l_type == lt_loaded)					      \
      printf ("name = \"%s\", opencount = %d\n",			      \
	      map->l_name, (int) map->l_opencount)

int
main (void)
{
  void *h[3];
  struct link_map *map;
  void (*fp) (void);

  h[0] = dlopen ("unload2mod.so", RTLD_LAZY);
  h[1] = dlopen ("unload2mod.so", RTLD_LAZY);
  if (h[0] == NULL || h[1] == NULL)
    error (EXIT_FAILURE, errno, "cannot load \"unload2mod.so\"");
  h[2] = dlopen ("unload2dep.so", RTLD_LAZY);
  if (h[2] == NULL)
    error (EXIT_FAILURE, errno, "cannot load \"unload2dep.so\"");

  puts ("\nAfter loading everything:");
  OUT;

  dlclose (h[0]);

  puts ("\nAfter unloading \"unload2mod.so\" once:");
  OUT;

  dlclose (h[1]);

  puts ("\nAfter unloading \"unload2mod.so\" twice:");
  OUT;

  fp = dlsym (h[2], "foo");
  puts ("\nnow calling `foo'");
  fflush (stdout);
  fp ();
  puts ("managed to call `foo'");
  fflush (stdout);

  dlclose (h[2]);

  puts ("\nAfter unloading \"unload2dep.so\":");
  OUT;

  return 0;
}