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 int max_error = 2;
  20 #include "common.h"
  21
  22
  23 #include "magic.h"
  24
  25 int main (int argc, char *argv[])
  26 {
  27   void *dlhandle;
  28   long (*modf) (long, long *, long);
  29   long v, *cookie = NULL, cookie2 = 0;
  30
  31   start(63);
  32
  33   if(argc != 2) {
  34         fprintf(stderr, "Usage: %s <module>\n", argv[0]);
  35         exit(1);
  36   }
  37
  38   if(!(dlhandle = dlopen(argv[1], RTLD_LAZY))) e(1);
  39
  40   if(!(modf = dlsym(dlhandle, "modfunction"))) e(2);
  41   if(!(cookie = (long *) dlsym(dlhandle, "cookie"))) e(3);
  42
  43   if(*cookie == MAGIC2) { fprintf(stderr, "cookie already set\n"); e(4); }
  44   if(cookie2 == MAGIC3) { fprintf(stderr, "cookie2 already set\n"); e(5); }
  45
  46   v = modf(MAGIC4, &cookie2, MAGIC5);
  47
  48   if(v != MAGIC1) { fprintf(stderr, "return value wrong\n"); e(9); }
  49   if(*cookie != MAGIC2) { fprintf(stderr, "cookie set wrongly\n"); e(6); }
  50   if(cookie2 != MAGIC3) { fprintf(stderr, "cookie2 set wrongly\n"); e(7); }
  51
  52   dlclose(dlhandle);
  53
  54   if(v != MAGIC1) { fprintf(stderr, "wrong return value.\n"); e(8); }
  55
  56   quit();
  57
  58   return(0);
  59 }