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DN/External/curl-8.17.0/lib/asyn-thrdd.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include "socketpair.h"
/***********************************************************************
* Only for threaded name resolves builds
**********************************************************************/
#ifdef CURLRES_THREADED
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
# include <pthread.h>
#endif
#ifdef HAVE_GETADDRINFO
# define RESOLVER_ENOMEM EAI_MEMORY /* = WSA_NOT_ENOUGH_MEMORY on Windows */
#else
# define RESOLVER_ENOMEM SOCKENOMEM
#endif
#include "urldata.h"
#include "cfilters.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "url.h"
#include "multiif.h"
#include "curl_threads.h"
#include "select.h"
#ifdef USE_ARES
#include <ares.h>
#ifdef USE_HTTPSRR
#define USE_HTTPSRR_ARES /* the combo */
#endif
#endif
/* The last 2 #include files should be in this order */
#include "curl_memory.h"
#include "memdebug.h"
/*
* Curl_async_global_init()
* Called from curl_global_init() to initialize global resolver environment.
* Does nothing here.
*/
int Curl_async_global_init(void)
{
#if defined(USE_ARES) && defined(CARES_HAVE_ARES_LIBRARY_INIT)
if(ares_library_init(ARES_LIB_INIT_ALL)) {
return CURLE_FAILED_INIT;
}
#endif
return CURLE_OK;
}
/*
* Curl_async_global_cleanup()
* Called from curl_global_cleanup() to destroy global resolver environment.
* Does nothing here.
*/
void Curl_async_global_cleanup(void)
{
#if defined(USE_ARES) && defined(CARES_HAVE_ARES_LIBRARY_INIT)
ares_library_cleanup();
#endif
}
static void async_thrdd_destroy(struct Curl_easy *);
static void async_thrdd_shutdown(struct Curl_easy *);
CURLcode Curl_async_get_impl(struct Curl_easy *data, void **impl)
{
(void)data;
*impl = NULL;
return CURLE_OK;
}
/* Give up reference to add_ctx */
static void addr_ctx_unlink(struct async_thrdd_addr_ctx **paddr_ctx,
struct Curl_easy *data)
{
struct async_thrdd_addr_ctx *addr_ctx = *paddr_ctx;
bool destroy;
(void)data;
if(!addr_ctx)
return;
Curl_mutex_acquire(&addr_ctx->mutx);
if(!data) /* called by resolving thread */
addr_ctx->thrd_done = TRUE;
DEBUGASSERT(addr_ctx->ref_count);
--addr_ctx->ref_count;
destroy = !addr_ctx->ref_count;
Curl_mutex_release(&addr_ctx->mutx);
if(destroy) {
Curl_mutex_destroy(&addr_ctx->mutx);
free(addr_ctx->hostname);
if(addr_ctx->res)
Curl_freeaddrinfo(addr_ctx->res);
#ifndef CURL_DISABLE_SOCKETPAIR
#ifndef USE_EVENTFD
wakeup_close(addr_ctx->sock_pair[1]);
#endif
wakeup_close(addr_ctx->sock_pair[0]);
#endif
free(addr_ctx);
}
*paddr_ctx = NULL;
}
/* Initialize context for threaded resolver */
static struct async_thrdd_addr_ctx *
addr_ctx_create(struct Curl_easy *data,
const char *hostname, int port,
const struct addrinfo *hints)
{
struct async_thrdd_addr_ctx *addr_ctx = calloc(1, sizeof(*addr_ctx));
if(!addr_ctx)
return NULL;
addr_ctx->thread_hnd = curl_thread_t_null;
addr_ctx->port = port;
addr_ctx->ref_count = 1;
#ifdef HAVE_GETADDRINFO
DEBUGASSERT(hints);
addr_ctx->hints = *hints;
#else
(void)hints;
#endif
Curl_mutex_init(&addr_ctx->mutx);
#ifndef CURL_DISABLE_SOCKETPAIR
/* create socket pair or pipe */
if(wakeup_create(addr_ctx->sock_pair, FALSE) < 0) {
addr_ctx->sock_pair[0] = CURL_SOCKET_BAD;
addr_ctx->sock_pair[1] = CURL_SOCKET_BAD;
goto err_exit;
}
#endif
addr_ctx->sock_error = 0;
/* Copying hostname string because original can be destroyed by parent
* thread during gethostbyname execution.
*/
addr_ctx->hostname = strdup(hostname);
if(!addr_ctx->hostname)
goto err_exit;
return addr_ctx;
err_exit:
addr_ctx_unlink(&addr_ctx, data);
return NULL;
}
#ifdef HAVE_GETADDRINFO
/*
* getaddrinfo_thread() resolves a name and then exits.
*
* For builds without ARES, but with USE_IPV6, create a resolver thread
* and wait on it.
*/
static CURL_THREAD_RETURN_T CURL_STDCALL getaddrinfo_thread(void *arg)
{
struct async_thrdd_addr_ctx *addr_ctx = arg;
bool do_abort;
Curl_mutex_acquire(&addr_ctx->mutx);
do_abort = addr_ctx->do_abort;
Curl_mutex_release(&addr_ctx->mutx);
if(!do_abort) {
char service[12];
int rc;
curl_msnprintf(service, sizeof(service), "%d", addr_ctx->port);
rc = Curl_getaddrinfo_ex(addr_ctx->hostname, service,
&addr_ctx->hints, &addr_ctx->res);
if(rc) {
addr_ctx->sock_error = SOCKERRNO ? SOCKERRNO : rc;
if(addr_ctx->sock_error == 0)
addr_ctx->sock_error = RESOLVER_ENOMEM;
}
else {
Curl_addrinfo_set_port(addr_ctx->res, addr_ctx->port);
}
Curl_mutex_acquire(&addr_ctx->mutx);
do_abort = addr_ctx->do_abort;
Curl_mutex_release(&addr_ctx->mutx);
#ifndef CURL_DISABLE_SOCKETPAIR
if(!do_abort) {
#ifdef USE_EVENTFD
const uint64_t buf[1] = { 1 };
#else
const char buf[1] = { 1 };
#endif
/* Thread is done, notify transfer */
if(wakeup_write(addr_ctx->sock_pair[1], buf, sizeof(buf)) < 0) {
/* update sock_error to errno */
addr_ctx->sock_error = SOCKERRNO;
}
}
#endif
}
addr_ctx_unlink(&addr_ctx, NULL);
return 0;
}
#else /* HAVE_GETADDRINFO */
/*
* gethostbyname_thread() resolves a name and then exits.
*/
static CURL_THREAD_RETURN_T CURL_STDCALL gethostbyname_thread(void *arg)
{
struct async_thrdd_addr_ctx *addr_ctx = arg;
bool do_abort;
Curl_mutex_acquire(&addr_ctx->mutx);
do_abort = addr_ctx->do_abort;
Curl_mutex_release(&addr_ctx->mutx);
if(!do_abort) {
addr_ctx->res = Curl_ipv4_resolve_r(addr_ctx->hostname, addr_ctx->port);
if(!addr_ctx->res) {
addr_ctx->sock_error = SOCKERRNO;
if(addr_ctx->sock_error == 0)
addr_ctx->sock_error = RESOLVER_ENOMEM;
}
Curl_mutex_acquire(&addr_ctx->mutx);
do_abort = addr_ctx->do_abort;
Curl_mutex_release(&addr_ctx->mutx);
#ifndef CURL_DISABLE_SOCKETPAIR
if(!do_abort) {
#ifdef USE_EVENTFD
const uint64_t buf[1] = { 1 };
#else
const char buf[1] = { 1 };
#endif
/* Thread is done, notify transfer */
if(wakeup_write(addr_ctx->sock_pair[1], buf, sizeof(buf)) < 0) {
/* update sock_error to errno */
addr_ctx->sock_error = SOCKERRNO;
}
}
#endif
}
addr_ctx_unlink(&addr_ctx, NULL);
return 0;
}
#endif /* HAVE_GETADDRINFO */
/*
* async_thrdd_destroy() cleans up async resolver data and thread handle.
*/
static void async_thrdd_destroy(struct Curl_easy *data)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
struct async_thrdd_addr_ctx *addr = thrdd->addr;
#ifdef USE_HTTPSRR_ARES
if(thrdd->rr.channel) {
ares_destroy(thrdd->rr.channel);
thrdd->rr.channel = NULL;
}
Curl_httpsrr_cleanup(&thrdd->rr.hinfo);
#endif
if(thrdd->addr && (thrdd->addr->thread_hnd != curl_thread_t_null)) {
bool done;
Curl_mutex_acquire(&addr->mutx);
#ifndef CURL_DISABLE_SOCKETPAIR
if(!addr->do_abort)
Curl_multi_will_close(data, addr->sock_pair[0]);
#endif
addr->do_abort = TRUE;
done = addr->thrd_done;
Curl_mutex_release(&addr->mutx);
if(done) {
Curl_thread_join(&addr->thread_hnd);
CURL_TRC_DNS(data, "async_thrdd_destroy, thread joined");
}
else {
/* thread is still running. Detach it. */
Curl_thread_destroy(&addr->thread_hnd);
CURL_TRC_DNS(data, "async_thrdd_destroy, thread detached");
}
}
/* release our reference to the shared context */
addr_ctx_unlink(&thrdd->addr, data);
}
#ifdef USE_HTTPSRR_ARES
static void async_thrdd_rr_done(void *user_data, ares_status_t status,
size_t timeouts,
const ares_dns_record_t *dnsrec)
{
struct Curl_easy *data = user_data;
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
(void)timeouts;
thrdd->rr.done = TRUE;
if((ARES_SUCCESS != status) || !dnsrec)
return;
thrdd->rr.result = Curl_httpsrr_from_ares(data, dnsrec, &thrdd->rr.hinfo);
}
static CURLcode async_rr_start(struct Curl_easy *data, int port)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
int status;
char *rrname = NULL;
DEBUGASSERT(!thrdd->rr.channel);
if(port != 443) {
rrname = curl_maprintf("_%d_.https.%s", port, data->conn->host.name);
if(!rrname)
return CURLE_OUT_OF_MEMORY;
}
status = ares_init_options(&thrdd->rr.channel, NULL, 0);
if(status != ARES_SUCCESS) {
thrdd->rr.channel = NULL;
return CURLE_FAILED_INIT;
}
#ifdef CURLDEBUG
if(getenv("CURL_DNS_SERVER")) {
const char *servers = getenv("CURL_DNS_SERVER");
status = ares_set_servers_ports_csv(thrdd->rr.channel, servers);
if(status)
return CURLE_FAILED_INIT;
}
#endif
memset(&thrdd->rr.hinfo, 0, sizeof(thrdd->rr.hinfo));
thrdd->rr.hinfo.port = -1;
thrdd->rr.hinfo.rrname = rrname;
ares_query_dnsrec(thrdd->rr.channel,
rrname ? rrname : data->conn->host.name, ARES_CLASS_IN,
ARES_REC_TYPE_HTTPS,
async_thrdd_rr_done, data, NULL);
CURL_TRC_DNS(data, "Issued HTTPS-RR request for %s", data->conn->host.name);
return CURLE_OK;
}
#endif
/*
* async_thrdd_init() starts a new thread that performs the actual
* resolve. This function returns before the resolve is done.
*
* Returns FALSE in case of failure, otherwise TRUE.
*/
static bool async_thrdd_init(struct Curl_easy *data,
const char *hostname, int port, int ip_version,
const struct addrinfo *hints)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
struct async_thrdd_addr_ctx *addr_ctx;
/* !checksrc! disable ERRNOVAR 1 */
int err = ENOMEM;
if(thrdd->addr
#ifdef USE_HTTPSRR_ARES
|| thrdd->rr.channel
#endif
) {
CURL_TRC_DNS(data, "starting new resolve, with previous not cleaned up");
async_thrdd_destroy(data);
DEBUGASSERT(!thrdd->addr);
#ifdef USE_HTTPSRR_ARES
DEBUGASSERT(!thrdd->rr.channel);
#endif
}
data->state.async.dns = NULL;
data->state.async.done = FALSE;
data->state.async.port = port;
data->state.async.ip_version = ip_version;
free(data->state.async.hostname);
data->state.async.hostname = strdup(hostname);
if(!data->state.async.hostname)
goto err_exit;
addr_ctx = addr_ctx_create(data, hostname, port, hints);
if(!addr_ctx)
goto err_exit;
thrdd->addr = addr_ctx;
/* passing addr_ctx to the thread adds a reference */
addr_ctx->ref_count = 2;
addr_ctx->start = curlx_now();
#ifdef HAVE_GETADDRINFO
addr_ctx->thread_hnd = Curl_thread_create(getaddrinfo_thread, addr_ctx);
#else
addr_ctx->thread_hnd = Curl_thread_create(gethostbyname_thread, addr_ctx);
#endif
if(addr_ctx->thread_hnd == curl_thread_t_null) {
/* The thread never started */
addr_ctx->ref_count = 1;
addr_ctx->thrd_done = TRUE;
err = errno;
goto err_exit;
}
#ifdef USE_HTTPSRR_ARES
if(async_rr_start(data, port))
infof(data, "Failed HTTPS RR operation");
#endif
CURL_TRC_DNS(data, "resolve thread started for of %s:%d", hostname, port);
return TRUE;
err_exit:
CURL_TRC_DNS(data, "resolve thread failed init: %d", err);
async_thrdd_destroy(data);
CURL_SETERRNO(err);
return FALSE;
}
static void async_thrdd_shutdown(struct Curl_easy *data)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
struct async_thrdd_addr_ctx *addr_ctx = thrdd->addr;
bool done;
if(!addr_ctx)
return;
if(addr_ctx->thread_hnd == curl_thread_t_null)
return;
Curl_mutex_acquire(&addr_ctx->mutx);
#ifndef CURL_DISABLE_SOCKETPAIR
if(!addr_ctx->do_abort)
Curl_multi_will_close(data, addr_ctx->sock_pair[0]);
#endif
addr_ctx->do_abort = TRUE;
done = addr_ctx->thrd_done;
Curl_mutex_release(&addr_ctx->mutx);
/* Wait for the thread to terminate if it is already marked done. If it is
not done yet we cannot do anything here. We had tried pthread_cancel but
it caused hanging and resource leaks (#18532). */
if(done && (addr_ctx->thread_hnd != curl_thread_t_null)) {
Curl_thread_join(&addr_ctx->thread_hnd);
CURL_TRC_DNS(data, "async_thrdd_shutdown, thread joined");
}
}
/*
* 'entry' may be NULL and then no data is returned
*/
static CURLcode asyn_thrdd_await(struct Curl_easy *data,
struct async_thrdd_addr_ctx *addr_ctx,
struct Curl_dns_entry **entry)
{
CURLcode result = CURLE_OK;
if(addr_ctx->thread_hnd != curl_thread_t_null) {
/* not interested in result? cancel, if still running... */
if(!entry)
async_thrdd_shutdown(data);
if(addr_ctx->thread_hnd != curl_thread_t_null) {
CURL_TRC_DNS(data, "resolve, wait for thread to finish");
if(!Curl_thread_join(&addr_ctx->thread_hnd)) {
DEBUGASSERT(0);
}
}
if(entry)
result = Curl_async_is_resolved(data, entry);
}
data->state.async.done = TRUE;
if(entry)
*entry = data->state.async.dns;
return result;
}
/*
* Until we gain a way to signal the resolver threads to stop early, we must
* simply wait for them and ignore their results.
*/
void Curl_async_thrdd_shutdown(struct Curl_easy *data)
{
async_thrdd_shutdown(data);
}
void Curl_async_thrdd_destroy(struct Curl_easy *data)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
if(thrdd->addr && !data->set.quick_exit) {
(void)asyn_thrdd_await(data, thrdd->addr, NULL);
}
async_thrdd_destroy(data);
}
/*
* Curl_async_await()
*
* Waits for a resolve to finish. This function should be avoided since using
* this risk getting the multi interface to "hang".
*
* If 'entry' is non-NULL, make it point to the resolved dns entry
*
* Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved,
* CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors.
*
* This is the version for resolves-in-a-thread.
*/
CURLcode Curl_async_await(struct Curl_easy *data,
struct Curl_dns_entry **entry)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
if(thrdd->addr)
return asyn_thrdd_await(data, thrdd->addr, entry);
return CURLE_FAILED_INIT;
}
/*
* Curl_async_is_resolved() is called repeatedly to check if a previous
* name resolve request has completed. It should also make sure to time-out if
* the operation seems to take too long.
*/
CURLcode Curl_async_is_resolved(struct Curl_easy *data,
struct Curl_dns_entry **dns)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
bool done = FALSE;
DEBUGASSERT(dns);
*dns = NULL;
if(data->state.async.done) {
*dns = data->state.async.dns;
CURL_TRC_DNS(data, "threaded: is_resolved(), already done, dns=%sfound",
*dns ? "" : "not ");
return CURLE_OK;
}
#ifdef USE_HTTPSRR_ARES
/* best effort, ignore errors */
if(thrdd->rr.channel)
(void)Curl_ares_perform(thrdd->rr.channel, 0);
#endif
DEBUGASSERT(thrdd->addr);
if(!thrdd->addr)
return CURLE_FAILED_INIT;
Curl_mutex_acquire(&thrdd->addr->mutx);
done = thrdd->addr->thrd_done;
Curl_mutex_release(&thrdd->addr->mutx);
if(done) {
CURLcode result = CURLE_OK;
data->state.async.done = TRUE;
Curl_resolv_unlink(data, &data->state.async.dns);
Curl_expire_done(data, EXPIRE_ASYNC_NAME);
if(thrdd->addr->res) {
data->state.async.dns =
Curl_dnscache_mk_entry(data, thrdd->addr->res,
data->state.async.hostname, 0,
data->state.async.port, FALSE);
thrdd->addr->res = NULL;
if(!data->state.async.dns)
result = CURLE_OUT_OF_MEMORY;
#ifdef USE_HTTPSRR_ARES
if(thrdd->rr.channel) {
result = thrdd->rr.result;
if(!result) {
struct Curl_https_rrinfo *lhrr;
lhrr = Curl_httpsrr_dup_move(&thrdd->rr.hinfo);
if(!lhrr)
result = CURLE_OUT_OF_MEMORY;
else
data->state.async.dns->hinfo = lhrr;
}
}
#endif
if(!result && data->state.async.dns)
result = Curl_dnscache_add(data, data->state.async.dns);
}
if(!result && !data->state.async.dns)
result = Curl_resolver_error(data, NULL);
if(result)
Curl_resolv_unlink(data, &data->state.async.dns);
*dns = data->state.async.dns;
CURL_TRC_DNS(data, "is_resolved() result=%d, dns=%sfound",
result, *dns ? "" : "not ");
async_thrdd_shutdown(data);
return result;
}
else {
/* poll for name lookup done with exponential backoff up to 250ms */
/* should be fine even if this converts to 32-bit */
timediff_t elapsed = curlx_timediff(curlx_now(),
data->progress.t_startsingle);
if(elapsed < 0)
elapsed = 0;
if(thrdd->addr->poll_interval == 0)
/* Start at 1ms poll interval */
thrdd->addr->poll_interval = 1;
else if(elapsed >= thrdd->addr->interval_end)
/* Back-off exponentially if last interval expired */
thrdd->addr->poll_interval *= 2;
if(thrdd->addr->poll_interval > 250)
thrdd->addr->poll_interval = 250;
thrdd->addr->interval_end = elapsed + thrdd->addr->poll_interval;
Curl_expire(data, thrdd->addr->poll_interval, EXPIRE_ASYNC_NAME);
return CURLE_OK;
}
}
CURLcode Curl_async_pollset(struct Curl_easy *data, struct easy_pollset *ps)
{
struct async_thrdd_ctx *thrdd = &data->state.async.thrdd;
CURLcode result = CURLE_OK;
bool thrd_done;
#if !defined(USE_HTTPSRR_ARES) && defined(CURL_DISABLE_SOCKETPAIR)
(void)ps;
#endif
#ifdef USE_HTTPSRR_ARES
if(thrdd->rr.channel) {
result = Curl_ares_pollset(data, thrdd->rr.channel, ps);
if(result)
return result;
}
#endif
if(!thrdd->addr)
return result;
Curl_mutex_acquire(&thrdd->addr->mutx);
thrd_done = thrdd->addr->thrd_done;
Curl_mutex_release(&thrdd->addr->mutx);
if(!thrd_done) {
#ifndef CURL_DISABLE_SOCKETPAIR
/* return read fd to client for polling the DNS resolution status */
result = Curl_pollset_add_in(data, ps, thrdd->addr->sock_pair[0]);
#else
timediff_t milli;
timediff_t ms = curlx_timediff(curlx_now(), thrdd->addr->start);
if(ms < 3)
milli = 0;
else if(ms <= 50)
milli = ms/3;
else if(ms <= 250)
milli = 50;
else
milli = 200;
Curl_expire(data, milli, EXPIRE_ASYNC_NAME);
#endif
}
return result;
}
#ifndef HAVE_GETADDRINFO
/*
* Curl_async_getaddrinfo() - for platforms without getaddrinfo
*/
struct Curl_addrinfo *Curl_async_getaddrinfo(struct Curl_easy *data,
const char *hostname,
int port,
int ip_version,
int *waitp)
{
(void)ip_version;
*waitp = 0; /* default to synchronous response */
/* fire up a new resolver thread! */
if(async_thrdd_init(data, hostname, port, ip_version, NULL)) {
*waitp = 1; /* expect asynchronous response */
return NULL;
}
failf(data, "getaddrinfo() thread failed");
return NULL;
}
#else /* !HAVE_GETADDRINFO */
/*
* Curl_async_getaddrinfo() - for getaddrinfo
*/
struct Curl_addrinfo *Curl_async_getaddrinfo(struct Curl_easy *data,
const char *hostname,
int port,
int ip_version,
int *waitp)
{
struct addrinfo hints;
int pf = PF_INET;
*waitp = 0; /* default to synchronous response */
CURL_TRC_DNS(data, "init threaded resolve of %s:%d", hostname, port);
#ifdef CURLRES_IPV6
if((ip_version != CURL_IPRESOLVE_V4) && Curl_ipv6works(data)) {
/* The stack seems to be IPv6-enabled */
if(ip_version == CURL_IPRESOLVE_V6)
pf = PF_INET6;
else
pf = PF_UNSPEC;
}
#else
(void)ip_version;
#endif /* CURLRES_IPV6 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype =
(Curl_conn_get_transport(data, data->conn) == TRNSPRT_TCP) ?
SOCK_STREAM : SOCK_DGRAM;
/* fire up a new resolver thread! */
if(async_thrdd_init(data, hostname, port, ip_version, &hints)) {
*waitp = 1; /* expect asynchronous response */
return NULL;
}
failf(data, "getaddrinfo() thread failed to start");
return NULL;
}
#endif /* !HAVE_GETADDRINFO */
#endif /* CURLRES_THREADED */
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