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[2];
70 void *obj3;
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
77 printf( format: "Loading shared object neededobj3.so\n");
78 obj3 = dlopen( file: "neededobj3.so", RTLD_LAZY);
79 if (obj3 == NULL)
80 {
81 printf (format: "%s\n", dlerror ());
82 exit (status: 1);
83 }
84 loaded[0] = "neededobj1.so";
85 loaded[1] = "neededobj2.so";
86 loaded[2] = "neededobj3.so";
87 errors += check_loaded_objects (loaded);
88
89 printf (format: "Now loading shared object neededobj2.so\n");
90 obj2[0] = dlopen (file: "neededobj2.so", RTLD_LAZY);
91 if (obj2[0] == NULL)
92 {
93 printf (format: "%s\n", dlerror ());
94 exit (status: 1);
95 }
96 errors += check_loaded_objects (loaded);
97
98 printf (format: "And loading shared object neededobj2.so again\n");
99 obj2[1] = dlopen (file: "neededobj2.so", RTLD_LAZY);
100 if (obj2[1] == NULL)
101 {
102 printf (format: "%s\n", dlerror ());
103 exit (status: 1);
104 }
105 errors += check_loaded_objects (loaded);
106
107 printf (format: "Closing neededobj2.so for the first time\n");
108 dlclose (handle: obj2[0]);
109 errors += check_loaded_objects (loaded);
110
111 printf (format: "Closing neededobj3.so\n");
112 dlclose (handle: obj3);
113 loaded[2] = NULL;
114 errors += check_loaded_objects (loaded);
115
116 printf (format: "Closing neededobj2.so for the second time\n");
117 dlclose (handle: obj2[1]);
118 loaded[0] = NULL;
119 loaded[1] = NULL;
120 errors += check_loaded_objects (loaded);
121
122 if (errors != 0)
123 printf (format: "%d errors found\n", errors);
124 return errors;
125}
126

source code of glibc/elf/neededtest.c