contrib/plugins/win32_linker.c

   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
  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