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#include <stdio.h>
#include <dlfcn.h>
typedef void* dllib_t;
typedef void* opqst_t;
dllib_t open_library(const char* library, int* err)
{
dllib_t lib = dlopen(library, RTLD_LAZY);
if (!lib) {
fprintf(stderr, "Error opening shared library: %s\n", dlerror());
*err = 1;
}
*err = 0;
return lib;
}
void* getsym(dllib_t handle, char* sym, int* err)
{
void* ret = dlsym(handle, sym);
if (!ret) {
fprintf(stderr, "Unable to read symbol '%s'\n", sym);
*err |= 1;
return NULL;
}
return ret;
}
void use_library(int argc, char** argv, dllib_t lib, int* err)
{
*err = 0;
opqst_t (*init)(int* argc, char*** argv) = getsym(lib, "plugin_init", err);
void (*teardown)() = getsym(lib, "plugin_teardown", err);
opqst_t (*sym)(opqst_t) = getsym(lib, "handle_thing", err);
if (*err) {
fprintf(stderr, "Unable to find symbol call_in.\n");
return;
}
opqst_t st = init(&argc, &argv);
for (int i = 0; i < 100000; ++ i) {
st = sym(st);
printf("stable_ptr: %p\n", st);
}
teardown();
}
int main(int argc, char** argv)
{
if (!argv[0] && !argv[1]) {
fprintf(stderr, "Missing argument.\n");
return 1;
}
int err = 0;
dllib_t lib = open_library(argv[1], &err);
if (err) {
return err;
}
use_library(argc, argv, lib, &err);
return 0;
}
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