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#include <dlfcn.h>
#include <elf.h>
#include <errno.h>
#include <error.h>
#include <link.h>
#include <stdio.h>
#include <stdlib.h>
#define MAPS ((struct link_map *) _r_debug.r_map)
#define OUT \
for (map = MAPS; map != NULL; map = map->l_next) \
if (map->l_type == lt_loaded) \
printf ("name = \"%s\", direct_opencount = %d\n", \
map->l_name, (int) map->l_direct_opencount); \
fflush (stdout)
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;
}
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