crypto/dllmain.c

   1 /*
   2  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib_int.h"
  11
  12 #if defined(_WIN32) || defined(__CYGWIN__)
  13 # ifdef __CYGWIN__
  14 /* pick DLL_[PROCESS|THREAD]_[ATTACH|DETACH] definitions */
  15 #  include <windows.h>
  16 /*
  17  * this has side-effect of _WIN32 getting defined, which otherwise is
  18  * mutually exclusive with __CYGWIN__...
  19  */
  20 # endif
  21
  22 /*
  23  * All we really need to do is remove the 'error' state when a thread
  24  * detaches
  25  */
  26
  27 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
  28 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  29 {
  30     switch (fdwReason) {
  31     case DLL_PROCESS_ATTACH:
  32         OPENSSL_cpuid_setup();
  33 # if defined(_WIN32_WINNT)
  34         {
  35             IMAGE_DOS_HEADER *dos_header = (IMAGE_DOS_HEADER *) hinstDLL;
  36             IMAGE_NT_HEADERS *nt_headers;
  37
  38             if (dos_header->e_magic == IMAGE_DOS_SIGNATURE) {
  39                 nt_headers = (IMAGE_NT_HEADERS *) ((char *)dos_header
  40                                                    + dos_header->e_lfanew);
  41                 if (nt_headers->Signature == IMAGE_NT_SIGNATURE &&
  42                     hinstDLL !=
  43                     (HINSTANCE) (nt_headers->OptionalHeader.ImageBase))
  44                     OPENSSL_NONPIC_relocated = 1;
  45             }
  46         }
  47 # endif
  48         break;
  49     case DLL_THREAD_ATTACH:
  50         break;
  51     case DLL_THREAD_DETACH:
  52         OPENSSL_thread_stop();
  53         break;
  54     case DLL_PROCESS_DETACH:
  55         break;
  56     }
  57     return (TRUE);
  58 }
  59 #endif
  60