[SPCA] finish linking

semester3/spca/code-examples/00_c/04_toolchain/01_dynamic_linking.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <dlfcn.h>  // contains addvec
+
+int x[2] = {1, 2}; int y[2] = {3, 4}; int z[2];
+
+int main(int argc, char *argv[])
+{
+    void *handle;
+    void (*addvec)(int *, int *, int *, int);       // Declaration
+    char *error;
+
+    handle = dlopen("./libvector.so", RTLD_LAZY);   // Load .so, makes addvec usable
+    if (!handle) {
+        fprintf(stderr, "%s\n", dlerror());
+        exit(1);
+    }
+
+    addvec = dlsym(handle, "addvec");               // get a pointer to advec
+    if ((error = dlerror()) != NULL) {
+        fprintf(stderr, "%s\n", error);
+        exit(1);
+    }
+
+    addvec(x, y, z, 2);                             // Now callable like any other function
+    printf("z = [%d %d]\n", z[0], z[1]);
+
+    if (dlclose(handle) < 0) {                      // Unload shared library
+        fprintf(stderr, "%s\n", dlerror());
+        exit(1);
+    }
+    return 0;
+}