crypto/dllmain.c

   1 /*
   2  * Copyright 2016-2017 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 "e_os.h"
  11 #include "internal/cryptlib_int.h"
  12
  13 #if defined(_WIN32) || defined(__CYGWIN__)
  14 # ifdef __CYGWIN__
  15 /* pick DLL_[PROCESS|THREAD]_[ATTACH|DETACH] definitions */
  16 #  include <windows.h>
  17 /*
  18  * this has side-effect of _WIN32 getting defined, which otherwise is
  19  * mutually exclusive with __CYGWIN__...
  20  */
  21 # endif
  22
  23 /*
  24  * All we really need to do is remove the 'error' state when a thread
  25  * detaches
  26  */
  27
  28 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
  29 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  30 {
  31     switch (fdwReason) {
  32     case DLL_PROCESS_ATTACH:
  33         OPENSSL_cpuid_setup();
  34 # if defined(_WIN32_WINNT)
  35         {
  36             IMAGE_DOS_HEADER *dos_header = (IMAGE_DOS_HEADER *) hinstDLL;
  37             IMAGE_NT_HEADERS *nt_headers;
  38
  39             if (dos_header->e_magic == IMAGE_DOS_SIGNATURE) {
  40                 nt_headers = (IMAGE_NT_HEADERS *) ((char *)dos_header
  41                                                    + dos_header->e_lfanew);
  42                 if (nt_headers->Signature == IMAGE_NT_SIGNATURE &&
  43                     hinstDLL !=
  44                     (HINSTANCE) (nt_headers->OptionalHeader.ImageBase))
  45                     OPENSSL_NONPIC_relocated = 1;
  46             }
  47         }
  48 # endif
  49         break;
  50     case DLL_THREAD_ATTACH:
  51         break;
  52     case DLL_THREAD_DETACH:
  53         OPENSSL_thread_stop();
  54         break;
  55     case DLL_PROCESS_DETACH:
  56         break;
  57     }
  58     return (TRUE);
  59 }
  60 #endif
  61