init.c
/*
* Written by Matt Caswell for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2016 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <internal/cryptlib_int.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/evp.h>
#include <internal/evp_int.h>
#include <internal/conf.h>
#include <internal/async.h>
#include <internal/engine.h>
#include <openssl/comp.h>
#include <internal/err.h>
#include <stdlib.h>
#include <assert.h>
static int stopped = 0;
static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
/* Implement "once" functionality */
#if !defined(OPENSSL_THREADS)
typedef int OPENSSL_INIT_ONCE;
# define OPENSSL_INIT_ONCE_STATIC_INIT 0
static void ossl_init_once_run(OPENSSL_INIT_ONCE *once, void (*init)(void))
{
if (*once == OPENSSL_INIT_ONCE_STATIC_INIT) {
*once = 1;
init();
}
}
static int ossl_init_setup_thread_stop(void)
{
/*
* There are no threads to stop. Do nothing.
*/
return 1;
}
static void ossl_init_thread_stop_cleanup(void)
{
}
static struct thread_local_inits_st *local = NULL;
static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
{
struct thread_local_inits_st *tmp;
tmp = local;
if (local == NULL && alloc)
tmp = local = OPENSSL_zalloc(sizeof(*local));
if (!alloc)
local = NULL;
return tmp;
}
#elif defined(OPENSSL_SYS_WINDOWS)
# include <windows.h>
# if _WIN32_WINNT < 0x0600
/*
* Versions before 0x0600 (Windows Vista, Windows Server 2008 or later) do not
* have InitOnceExecuteOnce, so we fall back to using a spinlock instead.
*/
typedef LONG OPENSSL_INIT_ONCE;
# define OPENSSL_INIT_ONCE_STATIC_INIT 0
# define ONCE_UNINITED 0
# define ONCE_ININIT 1
# define ONCE_DONE 2
static void ossl_init_once_run(OPENSSL_INIT_ONCE *once, void (*init)(void))
{
LONG volatile *lock = (LONG *)once;
LONG result;
if (*lock == ONCE_DONE)
return;
do {
result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
if (result == ONCE_UNINITED) {
init();
*lock = ONCE_DONE;
return;
}
} while (result == ONCE_ININIT);
}
# else
typedef INIT_ONCE OPENSSL_INIT_ONCE;
# define OPENSSL_INIT_ONCE_STATIC_INIT INIT_ONCE_STATIC_INIT
static BOOL CALLBACK once_cb(PINIT_ONCE once, PVOID initfp, PVOID *unused)
{
void (*init)(void) = initfp;
init();
return TRUE;
}
static void ossl_init_once_run(OPENSSL_INIT_ONCE *once, void (*init)(void))
{
InitOnceExecuteOnce((INIT_ONCE *)once, once_cb, init, NULL);
}
# endif
static DWORD threadstopkey = TLS_OUT_OF_INDEXES;
static int ossl_init_setup_thread_stop(void)
{
/*
* We use a dummy thread local key here. We use the destructor to detect
* when the thread is going to stop
*/
threadstopkey = TlsAlloc();
if (threadstopkey == TLS_OUT_OF_INDEXES)
return 0;
return 1;
}
static void ossl_init_thread_stop_cleanup(void)
{
if (threadstopkey != TLS_OUT_OF_INDEXES) {
TlsFree(threadstopkey);
}
}
static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
{
struct thread_local_inits_st *local = TlsGetValue(threadstopkey);
if (local == NULL && alloc) {
local = OPENSSL_zalloc(sizeof *local);
TlsSetValue(threadstopkey, local);
}
if (!alloc) {
TlsSetValue(threadstopkey, NULL);
}
return local;
}
#else /* pthreads */
# include <pthread.h>
static pthread_key_t threadstopkey;
typedef pthread_once_t OPENSSL_INIT_ONCE;
# define OPENSSL_INIT_ONCE_STATIC_INIT PTHREAD_ONCE_INIT
static void ossl_init_once_run(OPENSSL_INIT_ONCE *once, void (*init)(void))
{
pthread_once(once, init);
}
static void ossl_init_thread_stop_wrap(void *local)
{
ossl_init_thread_stop((struct thread_local_inits_st *)local);
}
static int ossl_init_setup_thread_stop(void)
{
/*
* We use a dummy thread local key here. We use the destructor to detect
* when the thread is going to stop
*/
return (pthread_key_create(&threadstopkey,
ossl_init_thread_stop_wrap) == 0);
}
static void ossl_init_thread_stop_cleanup(void)
{
}
static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
{
struct thread_local_inits_st *local = pthread_getspecific(threadstopkey);
if (local == NULL && alloc) {
local = OPENSSL_zalloc(sizeof *local);
pthread_setspecific(threadstopkey, local);
}
if (!alloc) {
pthread_setspecific(threadstopkey, NULL);
}
return local;
}
#endif
typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
struct ossl_init_stop_st {
void (*handler)(void);
OPENSSL_INIT_STOP *next;
};
static OPENSSL_INIT_STOP *stop_handlers = NULL;
static OPENSSL_INIT_ONCE base = OPENSSL_INIT_ONCE_STATIC_INIT;
static int base_inited = 0;
static void ossl_init_base(void)
{
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
#endif
ossl_init_setup_thread_stop();
atexit(OPENSSL_cleanup);
OPENSSL_cpuid_setup();
base_inited = 1;
}
static OPENSSL_INIT_ONCE load_crypto_strings = OPENSSL_INIT_ONCE_STATIC_INIT;
static int load_crypto_strings_inited = 0;
static void ossl_init_no_load_crypto_strings(void)
{
/* Do nothing in this case */
return;
}
static void ossl_init_load_crypto_strings(void)
{
/*
* OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
* pulling in all the error strings during static linking
*/
#if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
"err_load_crypto_strings_intern()\n");
# endif
err_load_crypto_strings_intern();
#endif
load_crypto_strings_inited = 1;
}
static OPENSSL_INIT_ONCE add_all_ciphers = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_add_all_ciphers(void)
{
/*
* OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
* pulling in all the ciphers during static linking
*/
#ifndef OPENSSL_NO_AUTOALGINIT
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
"openssl_add_all_ciphers_internal()\n");
# endif
openssl_add_all_ciphers_internal();
# ifndef OPENSSL_NO_ENGINE
# if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV)
ENGINE_setup_bsd_cryptodev();
# endif
# endif
#endif
}
static OPENSSL_INIT_ONCE add_all_digests = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_add_all_digests(void)
{
/*
* OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
* pulling in all the ciphers during static linking
*/
#ifndef OPENSSL_NO_AUTOALGINIT
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
"openssl_add_all_digests_internal()\n");
# endif
openssl_add_all_digests_internal();
# ifndef OPENSSL_NO_ENGINE
# if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV)
ENGINE_setup_bsd_cryptodev();
# endif
# endif
#endif
}
static void ossl_init_no_add_algs(void)
{
/* Do nothing */
return;
}
static OPENSSL_INIT_ONCE config = OPENSSL_INIT_ONCE_STATIC_INIT;
static int config_inited = 0;
static const char *config_filename;
static void ossl_init_config(void)
{
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr,
"OPENSSL_INIT: ossl_init_config: openssl_config_internal(%s)\n",
config_filename==NULL?"NULL":config_filename);
#endif
openssl_config_internal(config_filename);
config_inited = 1;
}
static void ossl_init_no_config(void)
{
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr,
"OPENSSL_INIT: ossl_init_config: openssl_no_config_internal()\n");
#endif
openssl_no_config_internal();
config_inited = 1;
}
static OPENSSL_INIT_ONCE async = OPENSSL_INIT_ONCE_STATIC_INIT;
static int async_inited = 0;
static void ossl_init_async(void)
{
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
#endif
async_init();
async_inited = 1;
}
#ifndef OPENSSL_NO_ENGINE
static int engine_inited = 0;
static OPENSSL_INIT_ONCE engine_openssl = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_openssl(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
"engine_load_openssl_internal()\n");
# endif
engine_load_openssl_internal();
engine_inited = 1;
}
# if !defined(OPENSSL_NO_HW) && \
(defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
static OPENSSL_INIT_ONCE engine_cryptodev = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_cryptodev(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_cryptodev: "
"engine_load_cryptodev_internal()\n");
# endif
engine_load_cryptodev_internal();
engine_inited = 1;
}
# endif
# ifndef OPENSSL_NO_RDRAND
static OPENSSL_INIT_ONCE engine_rdrand = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_rdrand(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
"engine_load_rdrand_internal()\n");
# endif
engine_load_rdrand_internal();
engine_inited = 1;
}
# endif
static OPENSSL_INIT_ONCE engine_dynamic = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_dynamic(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
"engine_load_dynamic_internal()\n");
# endif
engine_load_dynamic_internal();
engine_inited = 1;
}
# ifndef OPENSSL_NO_STATIC_ENGINE
# if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
static OPENSSL_INIT_ONCE engine_padlock = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_padlock(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
"engine_load_padlock_internal()\n");
# endif
engine_load_padlock_internal();
engine_inited = 1;
}
# endif
# if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
static OPENSSL_INIT_ONCE engine_capi = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_capi(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
"engine_load_capi_internal()\n");
# endif
engine_load_capi_internal();
engine_inited = 1;
}
# endif
static OPENSSL_INIT_ONCE engine_dasync = OPENSSL_INIT_ONCE_STATIC_INIT;
static void ossl_init_engine_dasync(void)
{
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dasync: "
"engine_load_dasync_internal()\n");
# endif
engine_load_dasync_internal();
engine_inited = 1;
}
# endif
#endif
static OPENSSL_INIT_ONCE zlib = OPENSSL_INIT_ONCE_STATIC_INIT;
static int zlib_inited = 0;
static void ossl_init_zlib(void)
{
/* Do nothing - we need to know about this for the later cleanup */
zlib_inited = 1;
}
static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
{
/* Can't do much about this */
if (locals == NULL)
return;
if (locals->async) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
"ASYNC_cleanup_thread()\n");
#endif
ASYNC_cleanup_thread();
}
if (locals->err_state) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
"ERR_remove_thread_state(NULL)\n");
#endif
ERR_remove_thread_state(NULL);
}
OPENSSL_free(locals);
ossl_init_thread_stop_cleanup();
}
void OPENSSL_thread_stop(void)
{
ossl_init_thread_stop(
(struct thread_local_inits_st *)ossl_init_get_thread_local(0));
}
int ossl_init_thread_start(uint64_t opts)
{
struct thread_local_inits_st *locals = ossl_init_get_thread_local(1);
if (locals == NULL)
return 0;
if (opts & OPENSSL_INIT_THREAD_ASYNC) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
"marking thread for async\n");
#endif
locals->async = 1;
}
if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
"marking thread for err_state\n");
#endif
locals->err_state = 1;
}
return 1;
}
void OPENSSL_cleanup(void)
{
OPENSSL_INIT_STOP *currhandler, *lasthandler;
/* If we've not been inited then no need to deinit */
if (!base_inited)
return;
/* Might be explicitly called and also by atexit */
if (stopped)
return;
stopped = 1;
/*
* Thread stop may not get automatically called by the thread library for
* the very last thread in some situations, so call it directly.
*/
ossl_init_thread_stop(ossl_init_get_thread_local(0));
currhandler = stop_handlers;
while (currhandler != NULL) {
currhandler->handler();
lasthandler = currhandler;
currhandler = currhandler->next;
OPENSSL_free(lasthandler);
}
stop_handlers = NULL;
/*
* We assume we are single-threaded for this function, i.e. no race
* conditions for the various "*_inited" vars below.
*/
if (zlib_inited) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
"COMP_zlib_cleanup()\n");
#endif
COMP_zlib_cleanup();
}
#ifndef OPENSSL_NO_ENGINE
if (engine_inited) {
# ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
"ENGINE_cleanup()\n");
# endif
ENGINE_cleanup();
}
#endif
if (load_crypto_strings_inited) {
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
"ERR_free_strings()\n");
#endif
ERR_free_strings();
}
#ifdef OPENSSL_INIT_DEBUG
fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
"CRYPTO_cleanup_all_ex_data()\n");
fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
"EVP_cleanup()\n");
fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
"CONF_modules_free()\n");
fprintf(stderr, "OPENSSL_INIT: OPENSSL_INIT_library_stop: "
"RAND_cleanup()\n");
#endif
CRYPTO_cleanup_all_ex_data();
EVP_cleanup();
CONF_modules_free();
RAND_cleanup();
base_inited = 0;
}
/*
* If this function is called with a non NULL settings value then it must be
* called prior to any threads making calls to any OpenSSL functions,
* i.e. passing a non-null settings value is assumed to be single-threaded.
*/
int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
{
static int stoperrset = 0;
if (stopped) {
if (!stoperrset) {
/*
* We only ever set this once to avoid getting into an infinite
* loop where the error system keeps trying to init and fails so
* sets an error etc
*/
stoperrset = 1;
CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
}
return 0;
}
ossl_init_once_run(&base, ossl_init_base);
if (opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
ossl_init_once_run(&load_crypto_strings,
ossl_init_no_load_crypto_strings);
if (opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
ossl_init_once_run(&load_crypto_strings, ossl_init_load_crypto_strings);
if (opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
ossl_init_once_run(&add_all_ciphers, ossl_init_no_add_algs);
if (opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
ossl_init_once_run(&add_all_ciphers, ossl_init_add_all_ciphers);
if (opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
ossl_init_once_run(&add_all_digests, ossl_init_no_add_algs);
if (opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
ossl_init_once_run(&add_all_digests, ossl_init_add_all_digests);
if (opts & OPENSSL_INIT_NO_LOAD_CONFIG) {
ossl_init_once_run(&config, ossl_init_no_config);
}
if (opts & OPENSSL_INIT_LOAD_CONFIG) {
CRYPTO_w_lock(CRYPTO_LOCK_INIT);
config_filename = (settings == NULL) ? NULL : settings->config_name;
ossl_init_once_run(&config, ossl_init_config);
CRYPTO_w_unlock(CRYPTO_LOCK_INIT);
}
if (opts & OPENSSL_INIT_ASYNC) {
ossl_init_once_run(&async, ossl_init_async);
}
#ifndef OPENSSL_NO_ENGINE
if (opts & OPENSSL_INIT_ENGINE_OPENSSL) {
ossl_init_once_run(&engine_openssl, ossl_init_engine_openssl);
}
# if !defined(OPENSSL_NO_HW) && \
(defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV))
if (opts & OPENSSL_INIT_ENGINE_CRYPTODEV) {
ossl_init_once_run(&engine_cryptodev, ossl_init_engine_cryptodev);
}
# endif
# ifndef OPENSSL_NO_RDRAND
if (opts & OPENSSL_INIT_ENGINE_RDRAND) {
ossl_init_once_run(&engine_rdrand, ossl_init_engine_rdrand);
}
# endif
if (opts & OPENSSL_INIT_ENGINE_DYNAMIC) {
ossl_init_once_run(&engine_dynamic, ossl_init_engine_dynamic);
}
# ifndef OPENSSL_NO_STATIC_ENGINE
# if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
if (opts & OPENSSL_INIT_ENGINE_PADLOCK) {
ossl_init_once_run(&engine_padlock, ossl_init_engine_padlock);
}
# endif
# if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
if (opts & OPENSSL_INIT_ENGINE_CAPI) {
ossl_init_once_run(&engine_capi, ossl_init_engine_capi);
}
# endif
if (opts & OPENSSL_INIT_ENGINE_DASYNC) {
ossl_init_once_run(&engine_dasync, ossl_init_engine_dasync);
}
# endif
if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
| OPENSSL_INIT_ENGINE_DASYNC | OPENSSL_INIT_ENGINE_OPENSSL)) {
ENGINE_register_all_complete();
}
#endif
if (opts & OPENSSL_INIT_ZLIB) {
ossl_init_once_run(&zlib, ossl_init_zlib);
}
return 1;
}
int OPENSSL_atexit(void (*handler)(void))
{
OPENSSL_INIT_STOP *newhand;
newhand = OPENSSL_malloc(sizeof(*newhand));
if (newhand == NULL)
return 0;
newhand->handler = handler;
newhand->next = stop_handlers;
stop_handlers = newhand;
return 1;
}
