test/test63.c

   1
   2 /* Code to test runtime linking functionality.
   3  * Load a shared object at runtime and verify that arguments passed to
   4  * and from a function that is dynamically looked up make sense.
   5  * This tests that (a) dynamic linking works at all (otherwise all the dl*
   6  * functions don't work) and (b) the dynamic loading functionality works
   7  * and (c) the PLT is sane and calling convention makes sense.
   8  *
   9  * We have to pass an absolute path to dlopen() for which we rely on
  10  * the test run script.
  11  *
  12  * The module we load is in mod.c.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <dlfcn.h>
  18
  19 #define MAX_ERROR 2
  20
  21 #include "magic.h"
  22 #include "common.c"
  23
  24 int main (int argc, char *argv[])
  25 {
  26   void *dlhandle;
  27   long (*modf) (long, long *, long);
  28   long v, *cookie = NULL, cookie2 = 0;
  29
  30   start(63);
  31
  32   if(argc != 2) {
  33         fprintf(stderr, "Usage: %s <module>\n", argv[0]);
  34         exit(1);
  35   }
  36
  37   if(!(dlhandle = dlopen(argv[1], RTLD_LAZY))) e(1);
  38
  39   if(!(modf = dlsym(dlhandle, "modfunction"))) e(2);
  40   if(!(cookie = (long *) dlsym(dlhandle, "cookie"))) e(3);
  41
  42   if(*cookie == MAGIC2) { fprintf(stderr, "cookie already set\n"); e(4); }
  43   if(cookie2 == MAGIC3) { fprintf(stderr, "cookie2 already set\n"); e(5); }
  44
  45   v = modf(MAGIC4, &cookie2, MAGIC5);
  46
  47   if(v != MAGIC1) { fprintf(stderr, "return value wrong\n"); e(9); }
  48   if(*cookie != MAGIC2) { fprintf(stderr, "cookie set wrongly\n"); e(6); }
  49   if(cookie2 != MAGIC3) { fprintf(stderr, "cookie2 set wrongly\n"); e(7); }
  50
  51   dlclose(dlhandle);
  52
  53   if(v != MAGIC1) { fprintf(stderr, "wrong return value.\n"); e(8); }
  54
  55   quit();
  56
  57   return(0);
  58 }