Add self_unload to main, print symbol addresses

Echo from game console

src/main.c

@@ -1,4 +1,10 @@
+
 #include <stdio.h>
+#include <dlfcn.h>
+
+#include "include/main.h"
+#include "include/globals.h"
+#include "include/sdk.h"
 
 /*
  * We need:
@@ -7,4 +13,30 @@
  */
 __attribute__((constructor)) void load(void) {
     printf("hl-cheat loaded!\n");
+
+    if (!globals_init()) {
+        printf("hl-cheats: load: error loading globals, aborting\n");
+        self_unload();
+        return;
+    }
+
+    printf("gp_engine: %p\n"
+           "gp_client: %p\n",
+           gp_engine, gp_client);
+
+    gp_engine->pfnClientCmd("echo \"Hello from the game's console!\"");
+}
+
+void self_unload(void) {
+    /*
+     * RTLD_LAZY: If the symbol is never referenced, then it is never resolved.
+     * RTLD_NOLOAD: Don't load the shared object.
+     */
+    void* self = dlopen("libhlcheat.so", RTLD_LAZY | RTLD_NOLOAD);
+
+    /* Close the call we just made to dlopen() */
+    dlclose(self);
+
+    /* Close the call our injector made */
+    dlclose(self);
 }