1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "curl_setup.h"
26
27 #ifdef USE_OPENSSL
28 #include <openssl/crypto.h>
29 #endif
30
31 /* The fourth-to-last include */
32 #ifdef __CYGWIN__
33 #define WIN32_LEAN_AND_MEAN
34 #include <windows.h>
35 #ifdef _WIN32
36 #undef _WIN32
37 #endif
38 #endif
39
40 /* The last 3 #include files should be in this order */
41 #include "curl_printf.h"
42 #include "curl_memory.h"
43 #include "memdebug.h"
44
45 /* DllMain() must only be defined for Windows and Cygwin DLL builds. */
46 #if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(CURL_STATICLIB)
47
48 #if defined(USE_OPENSSL) && \
49 !defined(OPENSSL_IS_AWSLC) && \
50 !defined(OPENSSL_IS_BORINGSSL) && \
51 !defined(LIBRESSL_VERSION_NUMBER) && \
52 (OPENSSL_VERSION_NUMBER >= 0x10100000L)
53 #define PREVENT_OPENSSL_MEMLEAK
54 #endif
55
56 #ifdef PREVENT_OPENSSL_MEMLEAK
57 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)58 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
59 {
60 (void)hinstDLL;
61 (void)lpvReserved;
62
63 switch(fdwReason) {
64 case DLL_PROCESS_ATTACH:
65 break;
66 case DLL_PROCESS_DETACH:
67 break;
68 case DLL_THREAD_ATTACH:
69 break;
70 case DLL_THREAD_DETACH:
71 /* Call OPENSSL_thread_stop to prevent a memory leak in case OpenSSL is
72 linked statically.
73 https://github.com/curl/curl/issues/12327#issuecomment-1826405944 */
74 OPENSSL_thread_stop();
75 break;
76 }
77 return TRUE;
78 }
79 #endif /* OpenSSL */
80
81 #endif /* DLL build */
82
