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#include <dlfcn.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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static sigjmp_buf jmpbuf;
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int fini_ran;
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static void
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__attribute__ ((noreturn))
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handler (int sig)
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{
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siglongjmp (jmpbuf, 1);
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}
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static int
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do_test (void)
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{
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/* We are testing the two possibilities to mark an object as not deletable:
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- marked on the linker commandline with `-z nodelete'
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- with the RTLD_NODELETE flag at dlopen()-time.
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The test we are performing should be safe. We are loading the objects,
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get the address of variables in the respective object, unload the object
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and then try to read the variable. If the object is unloaded this
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should lead to an segmentation fault. */
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int result = 0;
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void *p;
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struct sigaction sa;
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sa.sa_handler = handler;
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sigfillset (&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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if (sigaction (SIGSEGV, &sa, NULL) == -1)
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printf ("cannot install signal handler: %m\n");
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p = dlopen ("nodelmod1.so", RTLD_LAZY);
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if (p == NULL)
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{
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printf ("failed to load \"nodelmod1.so\": %s\n", dlerror ());
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result = 1;
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}
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else
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{
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int *varp;
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puts ("succeeded loading \"nodelmod1.so\"");
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varp = dlsym (p, "var1");
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if (varp == NULL)
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{
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puts ("failed to get address of \"var1\" in \"nodelmod1.so\"");
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result = 1;
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}
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else
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{
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*varp = 20000720;
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/* Now close the object. */
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fini_ran = 0;
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if (dlclose (p) != 0)
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{
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puts ("failed to close \"nodelmod1.so\"");
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result = 1;
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}
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else if (! sigsetjmp (jmpbuf, 1))
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{
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/* Access the variable again. */
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if (*varp != 20000720)
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{
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puts ("\"var1\" value not correct");
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result = 1;
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}
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else if (fini_ran != 0)
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{
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puts ("destructor of \"nodelmod1.so\" ran");
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result = 1;
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}
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else
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puts ("-z nodelete test succeeded");
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}
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else
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{
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/* We caught an segmentation fault. */
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puts ("\"nodelmod1.so\" got deleted");
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result = 1;
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}
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}
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}
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p = dlopen ("nodelmod2.so", RTLD_LAZY | RTLD_NODELETE);
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if (p == NULL)
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{
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printf ("failed to load \"nodelmod2.so\": %s\n", dlerror ());
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result = 1;
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}
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else
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{
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int *varp;
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puts ("succeeded loading \"nodelmod2.so\"");
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varp = dlsym (p, "var2");
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if (varp == NULL)
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{
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puts ("failed to get address of \"var2\" in \"nodelmod2.so\"");
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result = 1;
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}
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else
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{
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*varp = 42;
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/* Now close the object. */
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fini_ran = 0;
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if (dlclose (p) != 0)
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{
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puts ("failed to close \"nodelmod2.so\"");
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result = 1;
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}
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else if (! sigsetjmp (jmpbuf, 1))
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{
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/* Access the variable again. */
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if (*varp != 42)
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{
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puts ("\"var2\" value not correct");
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result = 1;
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}
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else if (fini_ran != 0)
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{
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puts ("destructor of \"nodelmod2.so\" ran");
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result = 1;
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}
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else
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puts ("RTLD_NODELETE test succeeded");
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}
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else
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{
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/* We caught an segmentation fault. */
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puts ("\"nodelmod2.so\" got deleted");
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result = 1;
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}
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}
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}
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p = dlopen ("nodelmod3.so", RTLD_LAZY);
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if (p == NULL)
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{
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printf ("failed to load \"nodelmod3.so\": %s\n", dlerror ());
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result = 1;
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}
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else
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{
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int *(*fctp) (void);
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puts ("succeeded loading \"nodelmod3.so\"");
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fctp = dlsym (p, "addr");
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if (fctp == NULL)
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{
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puts ("failed to get address of \"addr\" in \"nodelmod3.so\"");
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result = 1;
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}
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else
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{
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int *varp = fctp ();
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*varp = -1;
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/* Now close the object. */
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fini_ran = 0;
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if (dlclose (p) != 0)
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{
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puts ("failed to close \"nodelmod3.so\"");
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result = 1;
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}
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else if (! sigsetjmp (jmpbuf, 1))
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{
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/* Access the variable again. */
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if (*varp != -1)
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{
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puts ("\"var_in_mod4\" value not correct");
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result = 1;
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}
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else if (fini_ran != 0)
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{
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puts ("destructor of \"nodelmod4.so\" ran");
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result = 1;
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}
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else
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puts ("-z nodelete in dependency succeeded");
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}
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else
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{
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/* We caught an segmentation fault. */
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puts ("\"nodelmod4.so\" got deleted");
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result = 1;
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}
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}
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}
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return result;
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}
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#include <support/test-driver.c>
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