60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
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#include <dlfcn.h>
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#include <elf.h>
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#include <errno.h>
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#include <error.h>
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#include <link.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define MAPS ((struct link_map *) _r_debug.r_map)
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#define OUT \
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for (map = MAPS; map != NULL; map = map->l_next) \
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if (map->l_type == lt_loaded) \
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printf ("name = \"%s\", direct_opencount = %d\n", \
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map->l_name, (int) map->l_direct_opencount); \
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fflush (stdout)
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int
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main (void)
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{
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void *h[3];
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struct link_map *map;
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void (*fp) (void);
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h[0] = dlopen ("unload2mod.so", RTLD_LAZY);
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h[1] = dlopen ("unload2mod.so", RTLD_LAZY);
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if (h[0] == NULL || h[1] == NULL)
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error (EXIT_FAILURE, errno, "cannot load \"unload2mod.so\"");
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h[2] = dlopen ("unload2dep.so", RTLD_LAZY);
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if (h[2] == NULL)
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error (EXIT_FAILURE, errno, "cannot load \"unload2dep.so\"");
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puts ("\nAfter loading everything:");
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OUT;
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dlclose (h[0]);
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puts ("\nAfter unloading \"unload2mod.so\" once:");
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OUT;
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dlclose (h[1]);
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puts ("\nAfter unloading \"unload2mod.so\" twice:");
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OUT;
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fp = dlsym (h[2], "foo");
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puts ("\nnow calling `foo'");
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fflush (stdout);
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fp ();
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puts ("managed to call `foo'");
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fflush (stdout);
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dlclose (h[2]);
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puts ("\nAfter unloading \"unload2dep.so\":");
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OUT;
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return 0;
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}
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