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glibc  2.9
Defines | Functions | Variables
nodelete.c File Reference
#include <dlfcn.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include "../test-skeleton.c"

Go to the source code of this file.

Defines

#define TEST_FUNCTION   do_test ()

Functions

static void __attribute__ ((noreturn))
static int do_test (void)

Variables

static sigjmp_buf jmpbuf
int fini_ran

Define Documentation

#define TEST_FUNCTION   do_test ()

Definition at line 21 of file nodelete.c.


Function Documentation

static void __attribute__ ( (noreturn)  ) [static]

Definition at line 14 of file nodelete.c.

{
  siglongjmp (jmpbuf, 1);
}
static int do_test ( void  ) [static]

Definition at line 23 of file nodelete.c.

{
  /* 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;
}

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Variable Documentation

Definition at line 10 of file nodelete.c.

sigjmp_buf jmpbuf [static]

Definition at line 7 of file nodelete.c.