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dll.c
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dll.c
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#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int x[2] = {1, 2};
int y[2] = {3, 4};
int z[2];
int main()
{
void *handle;
void (*addvec)(int *, int *, int *, int);
char *error;
/* dynamically load the shared library that contains addvec() */
handle = dlopen("./libvector.so", RTLD_LAZY);
if (!handle) {
fprintf(stderr, "%s\n", dlerror());
exit(1);
}
/* get a pointer to the addvec() function we just loaded */
addvec = dlsym(handle, "addvec");
if ((error = dlerror()) != NULL) {
fprintf(stderr, "%s\n", error);
exit(1);
}
/* Now we can call addvec() it just like any other function */
addvec(x, y, z, 2);
printf("z = [%d %d]\n", z[0], z[1]);
/* unload the shared library */
if (dlclose(handle) < 0) {
fprintf(stderr, "%s\n", dlerror());
exit(1);
}
return 0;
}