#include <sys/types.h>

#include <dlfcn.h>

#include <error.h>

#include <mcheck.h>

#include <stdlib.h>

#include <unistd.h>

pid_t pid, pid2;

pid_t getpid(void)

{

  pid_t (*f)(void);

  f = (pid_t (*)(void)) dlsym (RTLD_NEXT, "getpid");

  if (f == NULL)

    error (EXIT_FAILURE, 0, "dlsym (RTLD_NEXT, \"getpid\"): %s", dlerror ());

  return (pid2 = f()) + 26;

}

int

main (void)

{

  pid_t (*f)(void);

  mtrace ();

  f = (pid_t (*)(void)) dlsym (RTLD_DEFAULT, "getpid");

  if (f == NULL)

    error (EXIT_FAILURE, 0, "dlsym (RTLD_DEFAULT, \"getpid\"): %s", dlerror ());

  pid = f();

  if (pid != pid2 + 26)

    error (EXIT_FAILURE, 0, "main getpid() not called");

  return 0;

}