2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include "internal/cryptlib_int.h"
12 #include <openssl/err.h>
13 #include "internal/rand_int.h"
14 #include "internal/bio.h"
15 #include <openssl/evp.h>
16 #include "internal/evp_int.h"
17 #include "internal/conf.h"
18 #include "internal/async.h"
19 #include "internal/engine.h"
20 #include "internal/comp.h"
21 #include "internal/err.h"
22 #include "internal/err_int.h"
23 #include "internal/objects.h"
26 #include "internal/thread_once.h"
27 #include "internal/dso_conf.h"
28 #include "internal/dso.h"
29 #include "internal/store.h"
31 static int stopped = 0;
34 * Since per-thread-specific-data destructors are not universally
35 * available, i.e. not on Windows, only below CRYPTO_THREAD_LOCAL key
36 * is assumed to have destructor associated. And then an effort is made
37 * to call this single destructor on non-pthread platform[s].
39 * Initial value is "impossible". It is used as guard value to shortcut
40 * destructor for threads terminating before libcrypto is initialized or
41 * after it's de-initialized. Access to the key doesn't have to be
42 * serialized for the said threads, because they didn't use libcrypto
43 * and it doesn't matter if they pick "impossible" or derefernce real
44 * key value and pull NULL past initialization in the first thread that
45 * intends to use libcrypto.
49 CRYPTO_THREAD_LOCAL value;
50 } destructor_key = { -1 };
52 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
54 static void ossl_init_thread_destructor(void *local)
56 ossl_init_thread_stop((struct thread_local_inits_st *)local);
59 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
61 struct thread_local_inits_st *local =
62 CRYPTO_THREAD_get_local(&destructor_key.value);
66 && (local = OPENSSL_zalloc(sizeof(*local))) != NULL
67 && !CRYPTO_THREAD_set_local(&destructor_key.value, local)) {
72 CRYPTO_THREAD_set_local(&destructor_key.value, NULL);
78 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
79 struct ossl_init_stop_st {
80 void (*handler)(void);
81 OPENSSL_INIT_STOP *next;
84 static OPENSSL_INIT_STOP *stop_handlers = NULL;
85 static CRYPTO_RWLOCK *init_lock = NULL;
87 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
88 static int base_inited = 0;
89 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
91 CRYPTO_THREAD_LOCAL key;
93 #ifdef OPENSSL_INIT_DEBUG
94 fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
96 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
97 ossl_malloc_setup_failures();
99 if (!CRYPTO_THREAD_init_local(&key, ossl_init_thread_destructor))
101 if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
103 OPENSSL_cpuid_setup();
105 destructor_key.value = key;
110 #ifdef OPENSSL_INIT_DEBUG
111 fprintf(stderr, "OPENSSL_INIT: ossl_init_base not ok!\n");
113 CRYPTO_THREAD_lock_free(init_lock);
116 CRYPTO_THREAD_cleanup_local(&key);
120 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
121 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
122 static int win32atexit(void)
129 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
131 #ifdef OPENSSL_INIT_DEBUG
132 fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
134 #ifndef OPENSSL_SYS_UEFI
136 /* We use _onexit() in preference because it gets called on DLL unload */
137 if (_onexit(win32atexit) == NULL)
140 if (atexit(OPENSSL_cleanup) != 0)
148 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
149 ossl_init_register_atexit)
151 #ifdef OPENSSL_INIT_DEBUG
152 fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
154 /* Do nothing in this case */
158 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
159 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
161 #ifdef OPENSSL_INIT_DEBUG
162 fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_nodelete()\n");
164 #if !defined(OPENSSL_NO_DSO) \
165 && !defined(OPENSSL_USE_NODELETE) \
166 && !defined(OPENSSL_NO_PINSHARED)
169 HMODULE handle = NULL;
172 /* We don't use the DSO route for WIN32 because there is a better way */
173 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
174 | GET_MODULE_HANDLE_EX_FLAG_PIN,
175 (void *)&base_inited, &handle);
177 # ifdef OPENSSL_INIT_DEBUG
178 fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",
179 (ret == TRUE ? "No!" : "Yes."));
181 return (ret == TRUE) ? 1 : 0;
185 * Deliberately leak a reference to ourselves. This will force the library
186 * to remain loaded until the atexit() handler is run at process exit.
192 if (!err_shelve_state(&err))
195 dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
196 # ifdef OPENSSL_INIT_DEBUG
197 fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",
198 (dso == NULL ? "No!" : "Yes."));
200 * In case of No!, it is uncertain our exit()-handlers can still be
201 * called. After dlclose() the whole library might have been unloaded
206 err_unshelve_state(err);
214 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
215 static int load_crypto_strings_inited = 0;
216 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
220 * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
221 * pulling in all the error strings during static linking
223 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
224 # ifdef OPENSSL_INIT_DEBUG
225 fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
226 "err_load_crypto_strings_int()\n");
228 ret = err_load_crypto_strings_int();
229 load_crypto_strings_inited = 1;
234 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
235 ossl_init_load_crypto_strings)
237 /* Do nothing in this case */
241 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
242 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
245 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
246 * pulling in all the ciphers during static linking
248 #ifndef OPENSSL_NO_AUTOALGINIT
249 # ifdef OPENSSL_INIT_DEBUG
250 fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
251 "openssl_add_all_ciphers_int()\n");
253 openssl_add_all_ciphers_int();
258 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
259 ossl_init_add_all_ciphers)
265 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
266 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
269 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
270 * pulling in all the ciphers during static linking
272 #ifndef OPENSSL_NO_AUTOALGINIT
273 # ifdef OPENSSL_INIT_DEBUG
274 fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
275 "openssl_add_all_digests()\n");
277 openssl_add_all_digests_int();
282 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
283 ossl_init_add_all_digests)
289 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
290 static int config_inited = 0;
291 static const char *appname;
292 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
294 #ifdef OPENSSL_INIT_DEBUG
296 "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
297 appname == NULL ? "NULL" : appname);
299 openssl_config_int(appname);
303 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
305 #ifdef OPENSSL_INIT_DEBUG
307 "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
309 openssl_no_config_int();
314 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
315 static int async_inited = 0;
316 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
318 #ifdef OPENSSL_INIT_DEBUG
319 fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
327 #ifndef OPENSSL_NO_ENGINE
328 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
329 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
331 # ifdef OPENSSL_INIT_DEBUG
332 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
333 "engine_load_openssl_int()\n");
335 engine_load_openssl_int();
338 # ifndef OPENSSL_NO_DEVCRYPTOENG
339 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
340 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
342 # ifdef OPENSSL_INIT_DEBUG
343 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_devcrypto: "
344 "engine_load_devcrypto_int()\n");
346 engine_load_devcrypto_int();
351 # ifndef OPENSSL_NO_RDRAND
352 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
353 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
355 # ifdef OPENSSL_INIT_DEBUG
356 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
357 "engine_load_rdrand_int()\n");
359 engine_load_rdrand_int();
363 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
364 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
366 # ifdef OPENSSL_INIT_DEBUG
367 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
368 "engine_load_dynamic_int()\n");
370 engine_load_dynamic_int();
373 # ifndef OPENSSL_NO_STATIC_ENGINE
374 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
375 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
376 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
378 # ifdef OPENSSL_INIT_DEBUG
379 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
380 "engine_load_padlock_int()\n");
382 engine_load_padlock_int();
386 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
387 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
388 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
390 # ifdef OPENSSL_INIT_DEBUG
391 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
392 "engine_load_capi_int()\n");
394 engine_load_capi_int();
398 # if !defined(OPENSSL_NO_AFALGENG)
399 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
400 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
402 # ifdef OPENSSL_INIT_DEBUG
403 fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
404 "engine_load_afalg_int()\n");
406 engine_load_afalg_int();
413 #ifndef OPENSSL_NO_COMP
414 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
416 static int zlib_inited = 0;
417 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
419 /* Do nothing - we need to know about this for the later cleanup */
425 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
427 /* Can't do much about this */
432 #ifdef OPENSSL_INIT_DEBUG
433 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
434 "async_delete_thread_state()\n");
436 async_delete_thread_state();
439 if (locals->err_state) {
440 #ifdef OPENSSL_INIT_DEBUG
441 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
442 "err_delete_thread_state()\n");
444 err_delete_thread_state();
448 #ifdef OPENSSL_INIT_DEBUG
449 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
450 "drbg_delete_thread_state()\n");
452 drbg_delete_thread_state();
455 OPENSSL_free(locals);
458 void OPENSSL_thread_stop(void)
460 if (destructor_key.sane != -1)
461 ossl_init_thread_stop(ossl_init_get_thread_local(0));
464 int ossl_init_thread_start(uint64_t opts)
466 struct thread_local_inits_st *locals;
468 if (!OPENSSL_init_crypto(0, NULL))
471 locals = ossl_init_get_thread_local(1);
476 if (opts & OPENSSL_INIT_THREAD_ASYNC) {
477 #ifdef OPENSSL_INIT_DEBUG
478 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
479 "marking thread for async\n");
484 if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
485 #ifdef OPENSSL_INIT_DEBUG
486 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
487 "marking thread for err_state\n");
489 locals->err_state = 1;
492 if (opts & OPENSSL_INIT_THREAD_RAND) {
493 #ifdef OPENSSL_INIT_DEBUG
494 fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
495 "marking thread for rand\n");
503 void OPENSSL_cleanup(void)
505 OPENSSL_INIT_STOP *currhandler, *lasthandler;
506 CRYPTO_THREAD_LOCAL key;
508 /* If we've not been inited then no need to deinit */
512 /* Might be explicitly called and also by atexit */
518 * Thread stop may not get automatically called by the thread library for
519 * the very last thread in some situations, so call it directly.
521 ossl_init_thread_stop(ossl_init_get_thread_local(0));
523 currhandler = stop_handlers;
524 while (currhandler != NULL) {
525 currhandler->handler();
526 lasthandler = currhandler;
527 currhandler = currhandler->next;
528 OPENSSL_free(lasthandler);
530 stop_handlers = NULL;
532 CRYPTO_THREAD_lock_free(init_lock);
536 * We assume we are single-threaded for this function, i.e. no race
537 * conditions for the various "*_inited" vars below.
540 #ifndef OPENSSL_NO_COMP
542 #ifdef OPENSSL_INIT_DEBUG
543 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
544 "comp_zlib_cleanup_int()\n");
546 comp_zlib_cleanup_int();
551 # ifdef OPENSSL_INIT_DEBUG
552 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
558 if (load_crypto_strings_inited) {
559 #ifdef OPENSSL_INIT_DEBUG
560 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
561 "err_free_strings_int()\n");
563 err_free_strings_int();
566 key = destructor_key.value;
567 destructor_key.sane = -1;
568 CRYPTO_THREAD_cleanup_local(&key);
570 #ifdef OPENSSL_INIT_DEBUG
571 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
572 "rand_cleanup_int()\n");
573 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
574 "conf_modules_free_int()\n");
575 #ifndef OPENSSL_NO_ENGINE
576 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
577 "engine_cleanup_int()\n");
579 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
580 "crypto_cleanup_all_ex_data_int()\n");
581 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
582 "bio_sock_cleanup_int()\n");
583 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
585 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
586 "evp_cleanup_int()\n");
587 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
588 "obj_cleanup_int()\n");
589 fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
593 * Note that cleanup order is important:
594 * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
595 * must be called before engine_cleanup_int()
596 * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
597 * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
598 * - conf_modules_free_int() can end up in ENGINE code so must be called
599 * before engine_cleanup_int()
600 * - ENGINEs and additional EVP algorithms might use added OIDs names so
601 * obj_cleanup_int() must be called last
604 rand_drbg_cleanup_int();
605 conf_modules_free_int();
606 #ifndef OPENSSL_NO_ENGINE
607 engine_cleanup_int();
609 ossl_store_cleanup_int();
610 crypto_cleanup_all_ex_data_int();
616 CRYPTO_secure_malloc_done();
622 * If this function is called with a non NULL settings value then it must be
623 * called prior to any threads making calls to any OpenSSL functions,
624 * i.e. passing a non-null settings value is assumed to be single-threaded.
626 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
629 if (!(opts & OPENSSL_INIT_BASE_ONLY))
630 CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
634 if (!RUN_ONCE(&base, ossl_init_base))
637 if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
638 if (!RUN_ONCE_ALT(®ister_atexit, ossl_init_no_register_atexit,
639 ossl_init_register_atexit))
641 } else if (!RUN_ONCE(®ister_atexit, ossl_init_register_atexit)) {
645 if (!(opts & OPENSSL_INIT_BASE_ONLY)
646 && !RUN_ONCE(&load_crypto_nodelete,
647 ossl_init_load_crypto_nodelete))
650 if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
651 && !RUN_ONCE_ALT(&load_crypto_strings,
652 ossl_init_no_load_crypto_strings,
653 ossl_init_load_crypto_strings))
656 if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
657 && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
660 if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
661 && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
662 ossl_init_add_all_ciphers))
665 if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
666 && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
669 if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
670 && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
671 ossl_init_add_all_digests))
674 if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
675 && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
678 if ((opts & OPENSSL_INIT_ATFORK)
679 && !openssl_init_fork_handlers())
682 if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
683 && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
686 if (opts & OPENSSL_INIT_LOAD_CONFIG) {
688 CRYPTO_THREAD_write_lock(init_lock);
689 appname = (settings == NULL) ? NULL : settings->appname;
690 ret = RUN_ONCE(&config, ossl_init_config);
691 CRYPTO_THREAD_unlock(init_lock);
696 if ((opts & OPENSSL_INIT_ASYNC)
697 && !RUN_ONCE(&async, ossl_init_async))
700 #ifndef OPENSSL_NO_ENGINE
701 if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
702 && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
704 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_DEVCRYPTOENG)
705 if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
706 && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
709 # ifndef OPENSSL_NO_RDRAND
710 if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
711 && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
714 if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
715 && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
717 # ifndef OPENSSL_NO_STATIC_ENGINE
718 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
719 if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
720 && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
723 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
724 if ((opts & OPENSSL_INIT_ENGINE_CAPI)
725 && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
728 # if !defined(OPENSSL_NO_AFALGENG)
729 if ((opts & OPENSSL_INIT_ENGINE_AFALG)
730 && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
734 if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
735 | OPENSSL_INIT_ENGINE_OPENSSL
736 | OPENSSL_INIT_ENGINE_AFALG)) {
737 ENGINE_register_all_complete();
741 #ifndef OPENSSL_NO_COMP
742 if ((opts & OPENSSL_INIT_ZLIB)
743 && !RUN_ONCE(&zlib, ossl_init_zlib))
750 int OPENSSL_atexit(void (*handler)(void))
752 OPENSSL_INIT_STOP *newhand;
754 #if !defined(OPENSSL_NO_DSO) \
755 && !defined(OPENSSL_USE_NODELETE)\
756 && !defined(OPENSSL_NO_PINSHARED)
763 handlersym.func = handler;
766 HMODULE handle = NULL;
770 * We don't use the DSO route for WIN32 because there is a better
773 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
774 | GET_MODULE_HANDLE_EX_FLAG_PIN,
775 handlersym.sym, &handle);
782 * Deliberately leak a reference to the handler. This will force the
783 * library/code containing the handler to remain loaded until we run the
784 * atexit handler. If -znodelete has been used then this is
791 dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
792 # ifdef OPENSSL_INIT_DEBUG
794 "OPENSSL_INIT: OPENSSL_atexit: obtained DSO reference? %s\n",
795 (dso == NULL ? "No!" : "Yes."));
796 /* See same code above in ossl_init_base() for an explanation. */
805 if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
806 CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
810 newhand->handler = handler;
811 newhand->next = stop_handlers;
812 stop_handlers = newhand;
817 #ifdef OPENSSL_SYS_UNIX
819 * The following three functions are for OpenSSL developers. This is
820 * where we set/reset state across fork (called via pthread_atfork when
821 * it exists, or manually by the application when it doesn't).
823 * WARNING! If you put code in either OPENSSL_fork_parent or
824 * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
825 * safe. See this link, for example:
826 * http://man7.org/linux/man-pages/man7/signal-safety.7.html
829 void OPENSSL_fork_prepare(void)
833 void OPENSSL_fork_parent(void)
837 void OPENSSL_fork_child(void)