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Diffstat (limited to 'REORG.TODO/elf/nodelete.c')
| -rw-r--r-- | REORG.TODO/elf/nodelete.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/REORG.TODO/elf/nodelete.c b/REORG.TODO/elf/nodelete.c new file mode 100644 index 0000000000..c8d71152f2 --- /dev/null +++ b/REORG.TODO/elf/nodelete.c @@ -0,0 +1,210 @@ +#include <dlfcn.h> +#include <setjmp.h> +#include <signal.h> +#include <stdio.h> + + +static sigjmp_buf jmpbuf; + + +int fini_ran; + + +static void +__attribute__ ((noreturn)) +handler (int sig) +{ + siglongjmp (jmpbuf, 1); +} + + +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. */ + int result = 0; + void *p; + struct sigaction sa; + + sa.sa_handler = handler; + sigfillset (&sa.sa_mask); + sa.sa_flags = SA_RESTART; + + if (sigaction (SIGSEGV, &sa, NULL) == -1) + printf ("cannot install signal handler: %m\n"); + + p = dlopen ("nodelmod1.so", RTLD_LAZY); + if (p == NULL) + { + printf ("failed to load \"nodelmod1.so\": %s\n", dlerror ()); + result = 1; + } + else + { + int *varp; + + puts ("succeeded loading \"nodelmod1.so\""); + + varp = dlsym (p, "var1"); + if (varp == NULL) + { + puts ("failed to get address of \"var1\" in \"nodelmod1.so\""); + result = 1; + } + else + { + *varp = 20000720; + + /* Now close the object. */ + fini_ran = 0; + if (dlclose (p) != 0) + { + puts ("failed to close \"nodelmod1.so\""); + result = 1; + } + else if (! sigsetjmp (jmpbuf, 1)) + { + /* Access the variable again. */ + if (*varp != 20000720) + { + puts ("\"var1\" value not correct"); + result = 1; + } + else if (fini_ran != 0) + { + puts ("destructor of \"nodelmod1.so\" ran"); + result = 1; + } + else + puts ("-z nodelete test succeeded"); + } + else + { + /* We caught an segmentation fault. */ + puts ("\"nodelmod1.so\" got deleted"); + result = 1; + } + } + } + + p = dlopen ("nodelmod2.so", RTLD_LAZY | RTLD_NODELETE); + if (p == NULL) + { + printf ("failed to load \"nodelmod2.so\": %s\n", dlerror ()); + result = 1; + } + else + { + int *varp; + + puts ("succeeded loading \"nodelmod2.so\""); + + varp = dlsym (p, "var2"); + if (varp == NULL) + { + puts ("failed to get address of \"var2\" in \"nodelmod2.so\""); + result = 1; + } + else + { + *varp = 42; + + /* Now close the object. */ + fini_ran = 0; + if (dlclose (p) != 0) + { + puts ("failed to close \"nodelmod2.so\""); + result = 1; + } + else if (! sigsetjmp (jmpbuf, 1)) + { + /* Access the variable again. */ + if (*varp != 42) + { + puts ("\"var2\" value not correct"); + result = 1; + } + else if (fini_ran != 0) + { + puts ("destructor of \"nodelmod2.so\" ran"); + result = 1; + } + else + puts ("RTLD_NODELETE test succeeded"); + } + else + { + /* We caught an segmentation fault. */ + puts ("\"nodelmod2.so\" got deleted"); + result = 1; + } + } + } + + p = dlopen ("nodelmod3.so", RTLD_LAZY); + if (p == NULL) + { + printf ("failed to load \"nodelmod3.so\": %s\n", dlerror ()); + result = 1; + } + else + { + int *(*fctp) (void); + + puts ("succeeded loading \"nodelmod3.so\""); + + fctp = dlsym (p, "addr"); + if (fctp == NULL) + { + puts ("failed to get address of \"addr\" in \"nodelmod3.so\""); + result = 1; + } + else + { + int *varp = fctp (); + + *varp = -1; + + /* Now close the object. */ + fini_ran = 0; + if (dlclose (p) != 0) + { + puts ("failed to close \"nodelmod3.so\""); + result = 1; + } + else if (! sigsetjmp (jmpbuf, 1)) + { + /* Access the variable again. */ + if (*varp != -1) + { + puts ("\"var_in_mod4\" value not correct"); + result = 1; + } + else if (fini_ran != 0) + { + puts ("destructor of \"nodelmod4.so\" ran"); + result = 1; + } + else + puts ("-z nodelete in dependency succeeded"); + } + else + { + /* We caught an segmentation fault. */ + puts ("\"nodelmod4.so\" got deleted"); + result = 1; + } + } + } + + return result; +} + +#include <support/test-driver.c> |