2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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"
30 #include <openssl/trace.h>
32 static int stopped = 0;
35 * Since per-thread-specific-data destructors are not universally
36 * available, i.e. not on Windows, only below CRYPTO_THREAD_LOCAL key
37 * is assumed to have destructor associated. And then an effort is made
38 * to call this single destructor on non-pthread platform[s].
40 * Initial value is "impossible". It is used as guard value to shortcut
41 * destructor for threads terminating before libcrypto is initialized or
42 * after it's de-initialized. Access to the key doesn't have to be
43 * serialized for the said threads, because they didn't use libcrypto
44 * and it doesn't matter if they pick "impossible" or derefernce real
45 * key value and pull NULL past initialization in the first thread that
46 * intends to use libcrypto.
50 CRYPTO_THREAD_LOCAL value;
51 } destructor_key = { -1 };
53 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
55 static void ossl_init_thread_destructor(void *local)
57 ossl_init_thread_stop((struct thread_local_inits_st *)local);
60 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
62 struct thread_local_inits_st *local =
63 CRYPTO_THREAD_get_local(&destructor_key.value);
67 && (local = OPENSSL_zalloc(sizeof(*local))) != NULL
68 && !CRYPTO_THREAD_set_local(&destructor_key.value, local)) {
73 CRYPTO_THREAD_set_local(&destructor_key.value, NULL);
79 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
80 struct ossl_init_stop_st {
81 void (*handler)(void);
82 OPENSSL_INIT_STOP *next;
85 static OPENSSL_INIT_STOP *stop_handlers = NULL;
86 static CRYPTO_RWLOCK *init_lock = NULL;
88 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
89 static int base_inited = 0;
90 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
92 CRYPTO_THREAD_LOCAL key;
94 if (ossl_trace_init() == 0)
97 OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
98 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
99 ossl_malloc_setup_failures();
101 if (!CRYPTO_THREAD_init_local(&key, ossl_init_thread_destructor))
103 if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
105 OPENSSL_cpuid_setup();
107 destructor_key.value = key;
112 OSSL_TRACE(INIT, "ossl_init_base failed!\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 OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
163 #if !defined(OPENSSL_USE_NODELETE) \
164 && !defined(OPENSSL_NO_PINSHARED)
165 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
167 HMODULE handle = NULL;
170 /* We don't use the DSO route for WIN32 because there is a better way */
171 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
172 | GET_MODULE_HANDLE_EX_FLAG_PIN,
173 (void *)&base_inited, &handle);
176 "ossl_init_load_crypto_nodelete: "
177 "obtained DSO reference? %s\n",
178 (ret == TRUE ? "No!" : "Yes."));
179 return (ret == TRUE) ? 1 : 0;
181 # elif !defined(DSO_NONE)
183 * Deliberately leak a reference to ourselves. This will force the library
184 * to remain loaded until the atexit() handler is run at process exit.
190 if (!err_shelve_state(&err))
193 dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
195 * In case of No!, it is uncertain our exit()-handlers can still be
196 * called. After dlclose() the whole library might have been unloaded
199 OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
200 (dso == NULL ? "No!" : "Yes."));
202 err_unshelve_state(err);
210 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
211 static int load_crypto_strings_inited = 0;
212 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
216 * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
217 * pulling in all the error strings during static linking
219 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
220 OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
221 ret = err_load_crypto_strings_int();
222 load_crypto_strings_inited = 1;
227 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
228 ossl_init_load_crypto_strings)
230 /* Do nothing in this case */
234 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
235 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
238 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
239 * pulling in all the ciphers during static linking
241 #ifndef OPENSSL_NO_AUTOALGINIT
242 OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
243 openssl_add_all_ciphers_int();
248 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
249 ossl_init_add_all_ciphers)
255 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
256 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
259 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
260 * pulling in all the ciphers during static linking
262 #ifndef OPENSSL_NO_AUTOALGINIT
263 OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
264 openssl_add_all_digests_int();
269 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
270 ossl_init_add_all_digests)
276 static CRYPTO_ONCE add_all_macs = CRYPTO_ONCE_STATIC_INIT;
277 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_macs)
280 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
281 * pulling in all the macs during static linking
283 #ifndef OPENSSL_NO_AUTOALGINIT
284 OSSL_TRACE(INIT, "openssl_add_all_macs_int()\n");
285 openssl_add_all_macs_int();
290 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_macs, ossl_init_add_all_macs)
296 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
297 static int config_inited = 0;
298 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
299 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
301 int ret = openssl_config_int(conf_settings);
305 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
307 OSSL_TRACE(INIT, "openssl_no_config_int()\n");
308 openssl_no_config_int();
313 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
314 static int async_inited = 0;
315 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
317 OSSL_TRACE(INIT, "async_init()\n");
324 #ifndef OPENSSL_NO_ENGINE
325 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
326 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
328 OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
329 engine_load_openssl_int();
332 # ifndef OPENSSL_NO_RDRAND
333 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
334 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
336 OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
337 engine_load_rdrand_int();
341 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
342 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
344 OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
345 engine_load_dynamic_int();
348 # ifndef OPENSSL_NO_STATIC_ENGINE
349 # ifndef OPENSSL_NO_DEVCRYPTOENG
350 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
351 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
353 OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
354 engine_load_devcrypto_int();
358 # if !defined(OPENSSL_NO_PADLOCKENG)
359 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
360 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
362 OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
363 engine_load_padlock_int();
367 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
368 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
369 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
371 OSSL_TRACE(INIT, "engine_load_capi_int()\n");
372 engine_load_capi_int();
376 # if !defined(OPENSSL_NO_AFALGENG)
377 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
378 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
380 OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
381 engine_load_afalg_int();
388 #ifndef OPENSSL_NO_COMP
389 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
391 static int zlib_inited = 0;
392 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
394 /* Do nothing - we need to know about this for the later cleanup */
400 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
402 /* Can't do much about this */
407 OSSL_TRACE(INIT, "async_delete_thread_state()\n");
408 async_delete_thread_state();
411 if (locals->err_state) {
412 OSSL_TRACE(INIT, "err_delete_thread_state()\n");
413 err_delete_thread_state();
417 OSSL_TRACE(INIT, "drbg_delete_thread_state()\n");
418 drbg_delete_thread_state();
421 OPENSSL_free(locals);
424 void OPENSSL_thread_stop(void)
426 if (destructor_key.sane != -1)
427 ossl_init_thread_stop(ossl_init_get_thread_local(0));
430 int ossl_init_thread_start(uint64_t opts)
432 struct thread_local_inits_st *locals;
434 if (!OPENSSL_init_crypto(0, NULL))
437 locals = ossl_init_get_thread_local(1);
442 if (opts & OPENSSL_INIT_THREAD_ASYNC) {
444 "ossl_init_thread_start: "
445 "marking thread for async\n");
449 if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
451 "ossl_init_thread_start: "
452 "marking thread for err_state\n");
453 locals->err_state = 1;
456 if (opts & OPENSSL_INIT_THREAD_RAND) {
458 "ossl_init_thread_start: "
459 "marking thread for rand\n");
466 void OPENSSL_cleanup(void)
468 OPENSSL_INIT_STOP *currhandler, *lasthandler;
469 CRYPTO_THREAD_LOCAL key;
471 /* If we've not been inited then no need to deinit */
475 /* Might be explicitly called and also by atexit */
481 * Thread stop may not get automatically called by the thread library for
482 * the very last thread in some situations, so call it directly.
484 ossl_init_thread_stop(ossl_init_get_thread_local(0));
486 currhandler = stop_handlers;
487 while (currhandler != NULL) {
488 currhandler->handler();
489 lasthandler = currhandler;
490 currhandler = currhandler->next;
491 OPENSSL_free(lasthandler);
493 stop_handlers = NULL;
495 CRYPTO_THREAD_lock_free(init_lock);
499 * We assume we are single-threaded for this function, i.e. no race
500 * conditions for the various "*_inited" vars below.
503 #ifndef OPENSSL_NO_COMP
505 OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
506 comp_zlib_cleanup_int();
511 OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
515 if (load_crypto_strings_inited) {
516 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
517 err_free_strings_int();
520 key = destructor_key.value;
521 destructor_key.sane = -1;
522 CRYPTO_THREAD_cleanup_local(&key);
525 * Note that cleanup order is important:
526 * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
527 * must be called before engine_cleanup_int()
528 * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
529 * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
530 * - conf_modules_free_int() can end up in ENGINE code so must be called
531 * before engine_cleanup_int()
532 * - ENGINEs and additional EVP algorithms might use added OIDs names so
533 * obj_cleanup_int() must be called last
535 OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
538 OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_drbg_cleanup_int()\n");
539 rand_drbg_cleanup_int();
541 OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
542 conf_modules_free_int();
543 #ifndef OPENSSL_NO_ENGINE
544 OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
545 engine_cleanup_int();
547 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
548 ossl_store_cleanup_int();
550 OSSL_TRACE(INIT, "OPENSSL_cleanup: crypto_cleanup_all_ex_data_int()\n");
551 crypto_cleanup_all_ex_data_int();
553 OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
556 OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
559 OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
562 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
565 OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
566 CRYPTO_secure_malloc_done();
568 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
569 ossl_trace_cleanup();
575 * If this function is called with a non NULL settings value then it must be
576 * called prior to any threads making calls to any OpenSSL functions,
577 * i.e. passing a non-null settings value is assumed to be single-threaded.
579 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
582 if (!(opts & OPENSSL_INIT_BASE_ONLY))
583 CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
588 * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
589 * *only* option specified. With that option we return immediately after
590 * doing the requested limited initialization. Note that
591 * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
592 * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
593 * base already initialized this is a harmless NOOP.
595 * If we remain the only caller of err_shelve_state() the recursion should
596 * perhaps be removed, but if in doubt, it can be left in place.
598 if (!RUN_ONCE(&base, ossl_init_base))
601 if (opts & OPENSSL_INIT_BASE_ONLY)
605 * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
606 * should not have the side-effect of setting up exit handlers, and
607 * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
610 if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
611 if (!RUN_ONCE_ALT(®ister_atexit, ossl_init_no_register_atexit,
612 ossl_init_register_atexit))
614 } else if (!RUN_ONCE(®ister_atexit, ossl_init_register_atexit)) {
618 if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
621 if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
622 && !RUN_ONCE_ALT(&load_crypto_strings,
623 ossl_init_no_load_crypto_strings,
624 ossl_init_load_crypto_strings))
627 if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
628 && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
631 if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
632 && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
633 ossl_init_add_all_ciphers))
636 if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
637 && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
640 if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
641 && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
642 ossl_init_add_all_digests))
645 if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
646 && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
649 if ((opts & OPENSSL_INIT_NO_ADD_ALL_MACS)
650 && !RUN_ONCE_ALT(&add_all_macs, ossl_init_no_add_all_macs,
651 ossl_init_add_all_macs))
654 if ((opts & OPENSSL_INIT_ADD_ALL_MACS)
655 && !RUN_ONCE(&add_all_macs, ossl_init_add_all_macs))
658 if ((opts & OPENSSL_INIT_ATFORK)
659 && !openssl_init_fork_handlers())
662 if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
663 && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
666 if (opts & OPENSSL_INIT_LOAD_CONFIG) {
668 CRYPTO_THREAD_write_lock(init_lock);
669 conf_settings = settings;
670 ret = RUN_ONCE(&config, ossl_init_config);
671 conf_settings = NULL;
672 CRYPTO_THREAD_unlock(init_lock);
677 if ((opts & OPENSSL_INIT_ASYNC)
678 && !RUN_ONCE(&async, ossl_init_async))
681 #ifndef OPENSSL_NO_ENGINE
682 if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
683 && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
685 # ifndef OPENSSL_NO_RDRAND
686 if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
687 && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
690 if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
691 && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
693 # ifndef OPENSSL_NO_STATIC_ENGINE
694 # ifndef OPENSSL_NO_DEVCRYPTOENG
695 if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
696 && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
699 # if !defined(OPENSSL_NO_PADLOCKENG)
700 if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
701 && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
704 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
705 if ((opts & OPENSSL_INIT_ENGINE_CAPI)
706 && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
709 # if !defined(OPENSSL_NO_AFALGENG)
710 if ((opts & OPENSSL_INIT_ENGINE_AFALG)
711 && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
715 if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
716 | OPENSSL_INIT_ENGINE_OPENSSL
717 | OPENSSL_INIT_ENGINE_AFALG)) {
718 ENGINE_register_all_complete();
722 #ifndef OPENSSL_NO_COMP
723 if ((opts & OPENSSL_INIT_ZLIB)
724 && !RUN_ONCE(&zlib, ossl_init_zlib))
731 int OPENSSL_atexit(void (*handler)(void))
733 OPENSSL_INIT_STOP *newhand;
735 #if !defined(OPENSSL_USE_NODELETE)\
736 && !defined(OPENSSL_NO_PINSHARED)
743 handlersym.func = handler;
744 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
746 HMODULE handle = NULL;
750 * We don't use the DSO route for WIN32 because there is a better
753 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
754 | GET_MODULE_HANDLE_EX_FLAG_PIN,
755 handlersym.sym, &handle);
760 # elif !defined(DSO_NONE)
762 * Deliberately leak a reference to the handler. This will force the
763 * library/code containing the handler to remain loaded until we run the
764 * atexit handler. If -znodelete has been used then this is
771 dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
772 /* See same code above in ossl_init_base() for an explanation. */
774 "atexit: obtained DSO reference? %s\n",
775 (dso == NULL ? "No!" : "Yes."));
783 if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
784 CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
788 newhand->handler = handler;
789 newhand->next = stop_handlers;
790 stop_handlers = newhand;
795 #ifdef OPENSSL_SYS_UNIX
797 * The following three functions are for OpenSSL developers. This is
798 * where we set/reset state across fork (called via pthread_atfork when
799 * it exists, or manually by the application when it doesn't).
801 * WARNING! If you put code in either OPENSSL_fork_parent or
802 * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
803 * safe. See this link, for example:
804 * http://man7.org/linux/man-pages/man7/signal-safety.7.html
807 void OPENSSL_fork_prepare(void)
811 void OPENSSL_fork_parent(void)
815 void OPENSSL_fork_child(void)