allow iohook and serial_hook to land on DLLs loaded after initialization

hook/iohook.c

@@ -229,11 +229,7 @@ static void iohook_init(void)
 
     /* Splice iohook into IAT entries referencing Win32 I/O APIs */
 
-    hook_table_apply(
-            NULL,
-            "kernel32.dll",
-            iohook_kernel32_syms,
-            _countof(iohook_kernel32_syms));
+    iohook_apply_hooks(NULL);
 
     /* Here be dragons:
 
@@ -281,6 +277,15 @@ static void iohook_init(void)
     LeaveCriticalSection(&iohook_lock);
 }
 
+void iohook_apply_hooks(HMODULE target)
+{
+    hook_table_apply(
+            target,
+            "kernel32.dll",
+            iohook_kernel32_syms,
+            _countof(iohook_kernel32_syms));
+}
+
 // Deprecated
 HANDLE iohook_open_dummy_fd(void)
 {

hook/iohook.h

@@ -48,3 +48,4 @@ __attribute__((deprecated("Use iohook_open_nul_fd instead")))
 HRESULT iohook_open_nul_fd(HANDLE *fd);
 HRESULT iohook_push_handler(iohook_fn_t fn);
 HRESULT iohook_invoke_next(struct irp *irp);
+void iohook_apply_hooks(HMODULE target);

hooklib/serial.c

@@ -84,10 +84,14 @@ void serial_hook_init(void)
         return;
     }
 
-    hook_table_apply(NULL, "kernel32.dll", serial_syms, _countof(serial_syms));
+    serial_hook_apply_hooks(NULL);
     serial_hook_initted = true;
 }
 
+void serial_hook_apply_hooks(HMODULE target) {
+    hook_table_apply(target, "kernel32.dll", serial_syms, _countof(serial_syms));
+}
+
 static BOOL WINAPI my_ClearCommError(
         HANDLE fd,
         uint32_t *errors,

hooklib/serial.h

@@ -1,3 +1,4 @@
 #pragma once
 
 void serial_hook_init(void);
+void serial_hook_apply_hooks(HMODULE target);