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 } 60