1 /*
2 * Copyright (C) 2023, Greg Manning <gmanning@rapitasystems.com>
3 *
4 * This hook, __pfnDliFailureHook2, is documented in the microsoft documentation here:
5 * https://learn.microsoft.com/en-us/cpp/build/reference/error-handling-and-notification
6 * It gets called when a delay-loaded DLL encounters various errors.
7 * We handle the specific case of a DLL looking for a "qemu.exe",
8 * and give it the running executable (regardless of what it is named).
9 *
10 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
11 * See the COPYING.LIB file in the top-level directory.
12 */
13
14 #include <windows.h>
15 #include <delayimp.h>
16
17 FARPROC WINAPI dll_failure_hook(unsigned dliNotify, PDelayLoadInfo pdli);
18
19
20 PfnDliHook __pfnDliFailureHook2 = dll_failure_hook;
21
dll_failure_hook(unsigned dliNotify,PDelayLoadInfo pdli)22 FARPROC WINAPI dll_failure_hook(unsigned dliNotify, PDelayLoadInfo pdli) {
23 if (dliNotify == dliFailLoadLib) {
24 /* If the failing request was for qemu.exe, ... */
25 if (strcmp(pdli->szDll, "qemu.exe") == 0) {
26 /* Then pass back a pointer to the top level module. */
27 HMODULE top = GetModuleHandle(NULL);
28 return (FARPROC) top;
29 }
30 }
31 /* Otherwise we can't do anything special. */
32 return 0;
33 }
34
35