elf/restest2.c

   1 #include <sys/types.h>
   2 #include <dlfcn.h>
   3 #include <error.h>
   4 #include <mcheck.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 pid_t pid, pid2;
   9
  10 pid_t getpid(void)
  11 {
  12   pid_t (*f)(void);
  13   f = (pid_t (*)(void)) dlsym (RTLD_NEXT, "getpid");
  14   if (f == NULL)
  15     error (EXIT_FAILURE, 0, "dlsym (RTLD_NEXT, \"getpid\"): %s", dlerror ());
  16   return (pid2 = f()) + 26;
  17 }
  18
  19 int
  20 main (void)
  21 {
  22   pid_t (*f)(void);
  23
  24   mtrace ();
  25
  26   f = (pid_t (*)(void)) dlsym (RTLD_DEFAULT, "getpid");
  27   if (f == NULL)
  28     error (EXIT_FAILURE, 0, "dlsym (RTLD_DEFAULT, \"getpid\"): %s", dlerror ());
  29   pid = f();
  30   if (pid != pid2 + 26)
  31     error (EXIT_FAILURE, 0, "main getpid() not called");
  32   return 0;
  33 }