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