112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
#include <dlfcn.h>
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#include <mcheck.h>
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#include <stdio.h>
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#include <stdlib.h>
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int
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main (void)
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{
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void *h1;
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void *h2;
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int (*fp) (void);
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int *vp;
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mtrace ();
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/* Open the two objects. */
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h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
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if (h1 == NULL)
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{
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printf ("cannot open reldepmod1.so: %s\n", dlerror ());
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exit (1);
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}
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h2 = dlopen ("reldepmod2.so", RTLD_LAZY);
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if (h2 == NULL)
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{
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printf ("cannot open reldepmod2.so: %s\n", dlerror ());
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exit (1);
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}
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/* Get the address of the variable in reldepmod1.so. */
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vp = dlsym (h1, "some_var");
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if (vp == NULL)
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{
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printf ("cannot get address of \"some_var\": %s\n", dlerror ());
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exit (1);
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}
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*vp = 42;
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/* Get the function `call_me' in the second object. This has a
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dependency which is resolved by a definition in reldepmod1.so. */
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fp = dlsym (h2, "call_me");
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if (fp == NULL)
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{
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printf ("cannot get address of \"call_me\": %s\n", dlerror ());
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exit (1);
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}
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/* Call the function. */
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if (fp () != 0)
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{
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puts ("function \"call_me\" returned wrong result");
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exit (1);
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}
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/* Now close the first object. If must still be around since we have
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an implicit dependency. */
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if (dlclose (h1) != 0)
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{
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printf ("closing h1 failed: %s\n", dlerror ());
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exit (1);
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}
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/* Try calling the function again. This will fail if the first object
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got unloaded. */
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if (fp () != 0)
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{
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puts ("second call of function \"call_me\" returned wrong result");
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exit (1);
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}
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/* Now close the second file as well. */
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if (dlclose (h2) != 0)
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{
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printf ("closing h2 failed: %s\n", dlerror ());
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exit (1);
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}
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/* Finally, open the first object again. */
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h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
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if (h1 == NULL)
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{
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printf ("cannot open reldepmod1.so the second time: %s\n", dlerror ());
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exit (1);
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}
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/* And get the variable address again. */
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vp = dlsym (h1, "some_var");
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if (vp == NULL)
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{
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printf ("cannot get address of \"some_var\" the second time: %s\n",
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dlerror ());
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exit (1);
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}
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/* The variable now must have its originial value. */
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if (*vp != 0)
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{
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puts ("variable \"some_var\" not reset");
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exit (1);
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}
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/* Close the first object again, we are done. */
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if (dlclose (h1) != 0)
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{
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printf ("closing h1 failed: %s\n", dlerror ());
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exit (1);
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}
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return 0;
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}
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