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
main(int argc,char * argv[])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