Update.
[glibc.git] / elf / reldep2.c
blobaadb0cbfdb1f121981174823db064a1fd400e5ab
1 #include <dlfcn.h>
2 #include <mcheck.h>
3 #include <stdio.h>
4 #include <stdlib.h>
6 int
7 main (void)
9 void *h1;
10 void *h2;
11 int (*fp) (void);
12 int *vp;
14 mtrace ();
16 /* Open the two objects. */
17 h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
18 if (h1 == NULL)
20 printf ("cannot open reldepmod1.so: %s\n", dlerror ());
21 exit (1);
23 h2 = dlopen ("reldepmod3.so", RTLD_LAZY);
24 if (h2 == NULL)
26 printf ("cannot open reldepmod3.so: %s\n", dlerror ());
27 exit (1);
30 /* Get the address of the variable in reldepmod1.so. */
31 vp = dlsym (h1, "some_var");
32 if (vp == NULL)
34 printf ("cannot get address of \"some_var\": %s\n", dlerror ());
35 exit (1);
38 *vp = 42;
40 /* Get the function `call_me' in the second object. This has a
41 dependency which is resolved by a definition in reldepmod1.so. */
42 fp = dlsym (h2, "call_me");
43 if (fp == NULL)
45 printf ("cannot get address of \"call_me\": %s\n", dlerror ());
46 exit (1);
49 /* Call the function. */
50 if (fp () != 0)
52 puts ("function \"call_me\" returned wrong result");
53 exit (1);
56 /* Now close the first object. If must still be around since we have
57 a implicit dependency. */
58 if (dlclose (h1) != 0)
60 printf ("closing h1 failed: %s\n", dlerror ());
61 exit (1);
64 /* Open the first object again. */
65 h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
66 if (h1 == NULL)
68 printf ("cannot open reldepmod1.so the second time: %s\n", dlerror ());
69 exit (1);
72 /* Get the variable address again. */
73 vp = dlsym (h1, "some_var");
74 if (vp == NULL)
76 printf ("cannot get address of \"some_var\" the second time: %s\n",
77 dlerror ());
78 exit (1);
81 /* The variable now must have its originial value. */
82 if (*vp != 42)
84 puts ("variable \"some_var\" reset");
85 exit (1);
88 /* Close the first object again, we are done. */
89 if (dlclose (h1) != 0)
91 printf ("closing h1 failed: %s\n", dlerror ());
92 exit (1);
94 if (dlclose (h2) != 0)
96 printf ("closing h2 failed: %s\n", dlerror ());
97 exit (1);
100 return 0;