1#include <dlfcn.h>
2#include <libintl.h>
3#include <link.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <string.h>
7
8#define MAPS ((struct link_map *) _r_debug.r_map)
9
10static int
11check_loaded_objects (const char **loaded)
12{
13 struct link_map *lm;
14 int n;
15 int *found = NULL;
16 int errors = 0;
17
18 for (n = 0; loaded[n]; n++)
19 /* NOTHING */;
20
21 if (n)
22 {
23 found = (int *) alloca (sizeof (int) * n);
24 memset (s: found, c: 0, n: sizeof (int) * n);
25 }
26
27 printf(format: " Name\n");
28 printf(format: " --------------------------------------------------------\n");
29 for (lm = MAPS; lm; lm = lm->l_next)
30 {
31 if (lm->l_name && lm->l_name[0])
32 printf(format: " %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
33 if (lm->l_type == lt_loaded && lm->l_name)
34 {
35 int match = 0;
36 for (n = 0; loaded[n] != NULL; n++)
37 {
38 if (strcmp (s1: basename (filename: loaded[n]), s2: basename (filename: lm->l_name)) == 0)
39 {
40 found[n] = 1;
41 match = 1;
42 break;
43 }
44 }
45
46 if (match == 0)
47 {
48 ++errors;
49 printf (format: "ERRORS: %s is not unloaded\n", lm->l_name);
50 }
51 }
52 }
53
54 for (n = 0; loaded[n] != NULL; n++)
55 {
56 if (found[n] == 0)
57 {
58 ++errors;
59 printf (format: "ERRORS: %s is not loaded\n", loaded[n]);
60 }
61 }
62
63 return errors;
64}
65
66int
67main (void)
68{
69 void *obj2;
70 void *obj3[2];
71 const char *loaded[] = { NULL, NULL, NULL, NULL };
72 int errors = 0;
73
74 printf (format: "\nThis is what is in memory now:\n");
75 errors += check_loaded_objects (loaded);
76 printf (format: "\nLoading shared object neededobj2.so\n");
77 obj2 = dlopen (file: "neededobj2.so", RTLD_LAZY);
78 if (obj2 == NULL)
79 {
80 printf (format: "%s\n", dlerror ());
81 exit (status: 1);
82 }
83 loaded[0] = "neededobj1.so";
84 loaded[1] = "neededobj2.so";
85 errors += check_loaded_objects (loaded);
86 printf (format: "\nLoading shared object neededobj3.so\n");
87 obj3[0] = dlopen( file: "neededobj3.so", RTLD_LAZY);
88 if (obj3[0] == NULL)
89 {
90 printf (format: "%s\n", dlerror ());
91 exit (status: 1);
92 }
93 loaded[2] = "neededobj3.so";
94 errors += check_loaded_objects (loaded);
95 printf (format: "\nNow loading shared object neededobj3.so again\n");
96 obj3[1] = dlopen (file: "neededobj3.so", RTLD_LAZY);
97 if (obj3[1] == NULL)
98 {
99 printf (format: "%s\n", dlerror ());
100 exit (status: 1);
101 }
102 errors += check_loaded_objects (loaded);
103 printf (format: "\nClosing neededobj3.so once\n");
104 dlclose (handle: obj3[0]);
105 errors += check_loaded_objects (loaded);
106 printf (format: "\nClosing neededobj2.so\n");
107 dlclose (handle: obj2);
108 errors += check_loaded_objects (loaded);
109 printf (format: "\nClosing neededobj3.so for the second time\n");
110 dlclose (handle: obj3[1]);
111 loaded[0] = NULL;
112 loaded[1] = NULL;
113 loaded[2] = NULL;
114 errors += check_loaded_objects (loaded);
115 if (errors != 0)
116 printf (format: "%d errors found\n", errors);
117 return errors;
118}
119

source code of glibc/elf/neededtest2.c