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_NO_DSO) \
164 && !defined(OPENSSL_USE_NODELETE) \
165 && !defined(OPENSSL_NO_PINSHARED)
168 HMODULE handle = NULL;
171 /* We don't use the DSO route for WIN32 because there is a better way */
172 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
173 | GET_MODULE_HANDLE_EX_FLAG_PIN,
174 (void *)&base_inited, &handle);
177 "ossl_init_load_crypto_nodelete: "
178 "obtained DSO reference? %s\n",
179 (ret == TRUE ? "No!" : "Yes."));
180 return (ret == TRUE) ? 1 : 0;
184 * Deliberately leak a reference to ourselves. This will force the library
185 * to remain loaded until the atexit() handler is run at process exit.
191 if (!err_shelve_state(&err))
194 dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
196 * In case of No!, it is uncertain our exit()-handlers can still be
197 * called. After dlclose() the whole library might have been unloaded
200 OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
201 (dso == NULL ? "No!" : "Yes."));
203 err_unshelve_state(err);
211 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
212 static int load_crypto_strings_inited = 0;
213 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
217 * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
218 * pulling in all the error strings during static linking
220 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
221 OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
222 ret = err_load_crypto_strings_int();
223 load_crypto_strings_inited = 1;
228 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
229 ossl_init_load_crypto_strings)
231 /* Do nothing in this case */
235 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
236 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
239 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
240 * pulling in all the ciphers during static linking
242 #ifndef OPENSSL_NO_AUTOALGINIT
243 OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
244 openssl_add_all_ciphers_int();
249 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
250 ossl_init_add_all_ciphers)
256 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
257 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
260 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
261 * pulling in all the ciphers during static linking
263 #ifndef OPENSSL_NO_AUTOALGINIT
264 OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
265 openssl_add_all_digests_int();
270 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
271 ossl_init_add_all_digests)
277 static CRYPTO_ONCE add_all_macs = CRYPTO_ONCE_STATIC_INIT;
278 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_macs)
281 * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
282 * pulling in all the macs during static linking
284 #ifndef OPENSSL_NO_AUTOALGINIT
285 OSSL_TRACE(INIT, "openssl_add_all_macs_int()\n");
286 openssl_add_all_macs_int();
291 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_macs, ossl_init_add_all_macs)
297 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
298 static int config_inited = 0;
299 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
300 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
302 int ret = openssl_config_int(conf_settings);
306 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
308 OSSL_TRACE(INIT, "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 OSSL_TRACE(INIT, "async_init()\n");
325 #ifndef OPENSSL_NO_ENGINE
326 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
327 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
329 OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
330 engine_load_openssl_int();
333 # ifndef OPENSSL_NO_RDRAND
334 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
335 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
337 OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
338 engine_load_rdrand_int();
342 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
343 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
345 OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
346 engine_load_dynamic_int();
349 # ifndef OPENSSL_NO_STATIC_ENGINE
350 # ifndef OPENSSL_NO_DEVCRYPTOENG
351 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
352 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
354 OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
355 engine_load_devcrypto_int();
359 # if !defined(OPENSSL_NO_PADLOCKENG)
360 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
361 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
363 OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
364 engine_load_padlock_int();
368 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
369 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
370 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
372 OSSL_TRACE(INIT, "engine_load_capi_int()\n");
373 engine_load_capi_int();
377 # if !defined(OPENSSL_NO_AFALGENG)
378 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
379 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
381 OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
382 engine_load_afalg_int();
389 #ifndef OPENSSL_NO_COMP
390 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
392 static int zlib_inited = 0;
393 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
395 /* Do nothing - we need to know about this for the later cleanup */
401 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
403 /* Can't do much about this */
408 OSSL_TRACE(INIT, "async_delete_thread_state()\n");
409 async_delete_thread_state();
412 if (locals->err_state) {
413 OSSL_TRACE(INIT, "err_delete_thread_state()\n");
414 err_delete_thread_state();
418 OSSL_TRACE(INIT, "drbg_delete_thread_state()\n");
419 drbg_delete_thread_state();
422 OPENSSL_free(locals);
425 void OPENSSL_thread_stop(void)
427 if (destructor_key.sane != -1)
428 ossl_init_thread_stop(ossl_init_get_thread_local(0));
431 int ossl_init_thread_start(uint64_t opts)
433 struct thread_local_inits_st *locals;
435 if (!OPENSSL_init_crypto(0, NULL))
438 locals = ossl_init_get_thread_local(1);
443 if (opts & OPENSSL_INIT_THREAD_ASYNC) {
445 "ossl_init_thread_start: "
446 "marking thread for async\n");
450 if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
452 "ossl_init_thread_start: "
453 "marking thread for err_state\n");
454 locals->err_state = 1;
457 if (opts & OPENSSL_INIT_THREAD_RAND) {
459 "ossl_init_thread_start: "
460 "marking thread for rand\n");
467 void OPENSSL_cleanup(void)
469 OPENSSL_INIT_STOP *currhandler, *lasthandler;
470 CRYPTO_THREAD_LOCAL key;
472 /* If we've not been inited then no need to deinit */
476 /* Might be explicitly called and also by atexit */
482 * Thread stop may not get automatically called by the thread library for
483 * the very last thread in some situations, so call it directly.
485 ossl_init_thread_stop(ossl_init_get_thread_local(0));
487 currhandler = stop_handlers;
488 while (currhandler != NULL) {
489 currhandler->handler();
490 lasthandler = currhandler;
491 currhandler = currhandler->next;
492 OPENSSL_free(lasthandler);
494 stop_handlers = NULL;
496 CRYPTO_THREAD_lock_free(init_lock);
500 * We assume we are single-threaded for this function, i.e. no race
501 * conditions for the various "*_inited" vars below.
504 #ifndef OPENSSL_NO_COMP
506 OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
507 comp_zlib_cleanup_int();
512 OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
516 if (load_crypto_strings_inited) {
517 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
518 err_free_strings_int();
521 key = destructor_key.value;
522 destructor_key.sane = -1;
523 CRYPTO_THREAD_cleanup_local(&key);
526 * Note that cleanup order is important:
527 * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
528 * must be called before engine_cleanup_int()
529 * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
530 * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
531 * - conf_modules_free_int() can end up in ENGINE code so must be called
532 * before engine_cleanup_int()
533 * - ENGINEs and additional EVP algorithms might use added OIDs names so
534 * obj_cleanup_int() must be called last
536 OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
539 OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_drbg_cleanup_int()\n");
540 rand_drbg_cleanup_int();
542 OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
543 conf_modules_free_int();
544 #ifndef OPENSSL_NO_ENGINE
545 OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
546 engine_cleanup_int();
548 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
549 ossl_store_cleanup_int();
551 OSSL_TRACE(INIT, "OPENSSL_cleanup: crypto_cleanup_all_ex_data_int()\n");
552 crypto_cleanup_all_ex_data_int();
554 OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
557 OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
560 OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
563 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
566 OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
567 CRYPTO_secure_malloc_done();
569 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
570 ossl_trace_cleanup();
576 * If this function is called with a non NULL settings value then it must be
577 * called prior to any threads making calls to any OpenSSL functions,
578 * i.e. passing a non-null settings value is assumed to be single-threaded.
580 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
583 if (!(opts & OPENSSL_INIT_BASE_ONLY))
584 CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
589 * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
590 * *only* option specified. With that option we return immediately after
591 * doing the requested limited initialization. Note that
592 * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
593 * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
594 * base already initialized this is a harmless NOOP.
596 * If we remain the only caller of err_shelve_state() the recursion should
597 * perhaps be removed, but if in doubt, it can be left in place.
599 if (!RUN_ONCE(&base, ossl_init_base))
602 if (opts & OPENSSL_INIT_BASE_ONLY)
606 * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
607 * should not have the side-effect of setting up exit handlers, and
608 * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
611 if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
612 if (!RUN_ONCE_ALT(®ister_atexit, ossl_init_no_register_atexit,
613 ossl_init_register_atexit))
615 } else if (!RUN_ONCE(®ister_atexit, ossl_init_register_atexit)) {
619 if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
622 if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
623 && !RUN_ONCE_ALT(&load_crypto_strings,
624 ossl_init_no_load_crypto_strings,
625 ossl_init_load_crypto_strings))
628 if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
629 && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
632 if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
633 && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
634 ossl_init_add_all_ciphers))
637 if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
638 && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
641 if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
642 && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
643 ossl_init_add_all_digests))
646 if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
647 && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
650 if ((opts & OPENSSL_INIT_NO_ADD_ALL_MACS)
651 && !RUN_ONCE_ALT(&add_all_macs, ossl_init_no_add_all_macs,
652 ossl_init_add_all_macs))
655 if ((opts & OPENSSL_INIT_ADD_ALL_MACS)
656 && !RUN_ONCE(&add_all_macs, ossl_init_add_all_macs))
659 if ((opts & OPENSSL_INIT_ATFORK)
660 && !openssl_init_fork_handlers())
663 if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
664 && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
667 if (opts & OPENSSL_INIT_LOAD_CONFIG) {
669 CRYPTO_THREAD_write_lock(init_lock);
670 conf_settings = settings;
671 ret = RUN_ONCE(&config, ossl_init_config);
672 conf_settings = NULL;
673 CRYPTO_THREAD_unlock(init_lock);
678 if ((opts & OPENSSL_INIT_ASYNC)
679 && !RUN_ONCE(&async, ossl_init_async))
682 #ifndef OPENSSL_NO_ENGINE
683 if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
684 && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
686 # ifndef OPENSSL_NO_RDRAND
687 if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
688 && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
691 if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
692 && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
694 # ifndef OPENSSL_NO_STATIC_ENGINE
695 # ifndef OPENSSL_NO_DEVCRYPTOENG
696 if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
697 && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
700 # if !defined(OPENSSL_NO_PADLOCKENG)
701 if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
702 && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
705 # if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
706 if ((opts & OPENSSL_INIT_ENGINE_CAPI)
707 && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
710 # if !defined(OPENSSL_NO_AFALGENG)
711 if ((opts & OPENSSL_INIT_ENGINE_AFALG)
712 && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
716 if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
717 | OPENSSL_INIT_ENGINE_OPENSSL
718 | OPENSSL_INIT_ENGINE_AFALG)) {
719 ENGINE_register_all_complete();
723 #ifndef OPENSSL_NO_COMP
724 if ((opts & OPENSSL_INIT_ZLIB)
725 && !RUN_ONCE(&zlib, ossl_init_zlib))
732 int OPENSSL_atexit(void (*handler)(void))
734 OPENSSL_INIT_STOP *newhand;
736 #if !defined(OPENSSL_NO_DSO) \
737 && !defined(OPENSSL_USE_NODELETE)\
738 && !defined(OPENSSL_NO_PINSHARED)
745 handlersym.func = handler;
748 HMODULE handle = NULL;
752 * We don't use the DSO route for WIN32 because there is a better
755 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
756 | GET_MODULE_HANDLE_EX_FLAG_PIN,
757 handlersym.sym, &handle);
764 * Deliberately leak a reference to the handler. This will force the
765 * library/code containing the handler to remain loaded until we run the
766 * atexit handler. If -znodelete has been used then this is
773 dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
774 /* See same code above in ossl_init_base() for an explanation. */
776 "atexit: obtained DSO reference? %s\n",
777 (dso == NULL ? "No!" : "Yes."));
785 if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
786 CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
790 newhand->handler = handler;
791 newhand->next = stop_handlers;
792 stop_handlers = newhand;
797 #ifdef OPENSSL_SYS_UNIX
799 * The following three functions are for OpenSSL developers. This is
800 * where we set/reset state across fork (called via pthread_atfork when
801 * it exists, or manually by the application when it doesn't).
803 * WARNING! If you put code in either OPENSSL_fork_parent or
804 * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
805 * safe. See this link, for example:
806 * http://man7.org/linux/man-pages/man7/signal-safety.7.html
809 void OPENSSL_fork_prepare(void)
813 void OPENSSL_fork_parent(void)
817 void OPENSSL_fork_child(void)