testloadso.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/* Test program to test dynamic loading with the loadso subsystem.
*/
#include <stdio.h>
#include <stdlib.h>
#include "SDL.h"
typedef int (*fntype)(const char *);
int main(int argc, char *argv[])
{
int retval = 0;
int hello = 0;
const char *libname = NULL;
const char *symname = NULL;
void *lib = NULL;
fntype fn = NULL;
if (argc != 3) {
22
23
24
const char *app = argv[0];
fprintf(stderr, "USAGE: %s <library> <functionname>\n", app);
fprintf(stderr, " %s --hello <lib with puts()>\n", app);
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
return 1;
}
/* Initialize SDL */
if ( SDL_Init(0) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
return 2;
}
if (strcmp(argv[1], "--hello") == 0) {
hello = 1;
libname = argv[2];
symname = "puts";
} else {
libname = argv[1];
symname = argv[2];
}
lib = SDL_LoadObject(libname);
if (lib == NULL) {
fprintf(stderr, "SDL_LoadObject('%s') failed: %s\n",
libname, SDL_GetError());
retval = 3;
} else {
fn = (fntype) SDL_LoadFunction(lib, symname);
if (fn == NULL) {
fprintf(stderr, "SDL_LoadFunction('%s') failed: %s\n",
symname, SDL_GetError());
retval = 4;
} else {
55
printf("Found %s in %s at %p\n", symname, libname, fn);
56
57
58
59
60
61
62
63
64
65
66
67
68
69
if (hello) {
printf("Calling function...\n");
fflush(stdout);
fn(" HELLO, WORLD!\n");
printf("...apparently, we survived. :)\n");
printf("Unloading library...\n");
fflush(stdout);
}
}
SDL_UnloadObject(lib);
}
SDL_Quit();
return(0);
}