feat(gotter)!: add DT_HASH fallback, relocation type guard, and hook_symbol

libdd-gotter/Cargo.toml

@@ -16,3 +16,6 @@ bench = false
 
 [dependencies]
 libc.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

libdd-gotter/README.md

@@ -21,13 +21,18 @@ unsafe extern "C" fn my_hook(/* same signature as target */) {
     // forward to original via ORIG_FN
 }
 
-let mut orig_addr: usize = 0;
-unsafe {
-    hook_symbol(c"__assert_fail", my_hook as *const () as usize, &mut orig_addr);
+match unsafe { hook_symbol(c"__assert_fail", my_hook as *const () as usize) } {
+    Ok(result) => {
+        // Release pairs with the Acquire load in my_hook, ensuring the GOT
+        // patches from hook_symbol are visible before the hook reads orig_addr.
+        ORIG_FN.store(result.orig_addr, Ordering::Release);
+
+        // result.entries_patched: number of GOT entries rewritten
+        // result.entries_failed: matched but mprotect failed
+    }
+    Err(HookError::SymbolNotFound) => { /* expected on musl/static libc */ }
+    Err(HookError::InvalidSymbolName) => { /* bug */ }
 }
-// Release pairs with the Acquire load in my_hook, ensuring the GOT
-// patches from hook_symbol are visible before the hook reads orig_addr.
-ORIG_FN.store(orig_addr, Ordering::Release);
 ```
 
 ### Multi-symbol registry (heap profiling hooking malloc/free/calloc/realloc)