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glibc  2.9
Defines | Functions
next.c File Reference
#include <stdio.h>
#include "../test-skeleton.c"

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Defines

#define TEST_FUNCTION   do_test ()

Functions

int successful_rtld_next_test (void)
void * failing_rtld_next_use (void)
static int do_test (void)

Define Documentation

#define TEST_FUNCTION   do_test ()

Definition at line 43 of file next.c.


Function Documentation

static int do_test ( void  ) [static]

Definition at line 9 of file next.c.

{
  int result;
  void *addr;

  /* First try call a function which uses RTLD_NEXT and calls that
     function.  */
  result = successful_rtld_next_test ();
  if (result == 42)
    {
      puts ("RTLD_NEXT seems to work for existing functions");
      result = 0;
    }
  else
    {
      printf ("Heh?  `successful_rtld_next_test' returned %d\n", result);
      result = 1;
    }

  /* Next try a function which tries to get a function with RTLD_NEXT
     but that fails.  This dlsym() call should return a NULL pointer
     and do nothing else.  */
  addr = failing_rtld_next_use ();
  if (addr == NULL)
    puts ("dlsym returned NULL for non-existing function.  Good");
  else
    {
      puts ("dlsym found something !?");
      result = 1;
    }

  return result;
}

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void * failing_rtld_next_use ( void  )

Definition at line 22 of file nextmod1.c.

{
  void *ret = dlsym (RTLD_NEXT, __FUNCTION__);

  /* Ensure we are not tail call optimized, because then RTLD_NEXT
     might return this function.  */
  ++nextmod1_dummy_var;
  return ret;
}

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Definition at line 9 of file nextmod1.c.

{
  int (*fp) (void);

  /* Get the next function... */
  fp = (int (*) (void)) dlsym (RTLD_NEXT, __FUNCTION__);

  /* ...and simply call it.  */
  return fp ();
}

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