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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef WIN32
/* POSIX defines 1024 for the FD_SETSIZE */
#define FD_SETSIZE 1024
#endif
#include "apr.h"
#include "apr_poll.h"
#include "apr_time.h"
#include "apr_portable.h"
#include "apr_atomic.h"
#include "apr_arch_file_io.h"
#include "apr_arch_networkio.h"
#include "apr_arch_poll_private.h"
#include "apr_arch_inherit.h"
static apr_pollset_method_e pollset_default_method = POLLSET_DEFAULT_METHOD;
static apr_status_t pollset_cleanup(void *p)
{
apr_pollset_t *pollset = (apr_pollset_t *) p;
if (pollset->provider->cleanup) {
(*pollset->provider->cleanup)(pollset);
}
if (pollset->flags & APR_POLLSET_WAKEABLE) {
apr_poll_close_wakeup_pipe(pollset->wakeup_pipe);
}
return APR_SUCCESS;
}
#if defined(HAVE_KQUEUE)
extern const apr_pollset_provider_t *apr_pollset_provider_kqueue;
#endif
#if defined(HAVE_PORT_CREATE)
extern const apr_pollset_provider_t *apr_pollset_provider_port;
#endif
#if defined(HAVE_EPOLL)
extern const apr_pollset_provider_t *apr_pollset_provider_epoll;
#endif
#if defined(HAVE_AIO_MSGQ)
extern const apr_pollset_provider_t *apr_pollset_provider_aio_msgq;
#endif
#if defined(HAVE_POLL)
extern const apr_pollset_provider_t *apr_pollset_provider_poll;
#endif
extern const apr_pollset_provider_t *apr_pollset_provider_select;
static const apr_pollset_provider_t *pollset_provider(apr_pollset_method_e method)
{
const apr_pollset_provider_t *provider = NULL;
switch (method) {
case APR_POLLSET_KQUEUE:
#if defined(HAVE_KQUEUE)
provider = apr_pollset_provider_kqueue;
#endif
break;
case APR_POLLSET_PORT:
#if defined(HAVE_PORT_CREATE)
provider = apr_pollset_provider_port;
#endif
break;
case APR_POLLSET_EPOLL:
#if defined(HAVE_EPOLL)
provider = apr_pollset_provider_epoll;
#endif
break;
case APR_POLLSET_AIO_MSGQ:
#if defined(HAVE_AIO_MSGQ)
provider = apr_pollset_provider_aio_msgq;
#endif
break;
case APR_POLLSET_POLL:
#if defined(HAVE_POLL)
provider = apr_pollset_provider_poll;
#endif
break;
case APR_POLLSET_SELECT:
provider = apr_pollset_provider_select;
break;
case APR_POLLSET_DEFAULT:
break;
}
return provider;
}
APR_DECLARE(apr_status_t) apr_pollset_create_ex(apr_pollset_t **ret_pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags,
apr_pollset_method_e method)
{
apr_status_t rv;
apr_pollset_t *pollset;
const apr_pollset_provider_t *provider = NULL;
*ret_pollset = NULL;
#ifdef WIN32
/* Favor WSAPoll if supported.
* This will work only if ws2_32.dll has WSAPoll funtion.
* In other cases it will fall back to select() method unless
* the APR_POLLSET_NODEFAULT is added to the flags.
*/
if (method == APR_POLLSET_DEFAULT) {
method = APR_POLLSET_POLL;
}
#endif
if (method == APR_POLLSET_DEFAULT)
method = pollset_default_method;
while (provider == NULL) {
provider = pollset_provider(method);
if (!provider) {
if ((flags & APR_POLLSET_NODEFAULT) == APR_POLLSET_NODEFAULT)
return APR_ENOTIMPL;
if (method == pollset_default_method)
return APR_ENOTIMPL;
method = pollset_default_method;
}
}
if (flags & APR_POLLSET_WAKEABLE) {
/* Add room for wakeup descriptor */
size++;
}
pollset = apr_palloc(p, sizeof(*pollset));
pollset->nelts = 0;
pollset->nalloc = size;
pollset->pool = p;
pollset->flags = flags;
pollset->provider = provider;
pollset->wakeup_set = 0;
rv = (*provider->create)(pollset, size, p, flags);
if (rv == APR_ENOTIMPL) {
if (method == pollset_default_method) {
return rv;
}
provider = pollset_provider(pollset_default_method);
if (!provider) {
return APR_ENOTIMPL;
}
rv = (*provider->create)(pollset, size, p, flags);
if (rv != APR_SUCCESS) {
return rv;
}
pollset->provider = provider;
}
else if (rv != APR_SUCCESS) {
return rv;
}
if (flags & APR_POLLSET_WAKEABLE) {
/* Create wakeup pipe */
if ((rv = apr_poll_create_wakeup_pipe(pollset->pool, &pollset->wakeup_pfd,
pollset->wakeup_pipe))
!= APR_SUCCESS) {
return rv;
}
if ((rv = apr_pollset_add(pollset, &pollset->wakeup_pfd)) != APR_SUCCESS) {
return rv;
}
}
if ((flags & APR_POLLSET_WAKEABLE) || provider->cleanup)
apr_pool_cleanup_register(p, pollset, pollset_cleanup,
apr_pool_cleanup_null);
*ret_pollset = pollset;
return APR_SUCCESS;
}
APR_DECLARE(const char *) apr_pollset_method_name(apr_pollset_t *pollset)
{
return pollset->provider->name;
}
APR_DECLARE(const char *) apr_poll_method_defname()
{
const apr_pollset_provider_t *provider = NULL;
provider = pollset_provider(pollset_default_method);
if (provider)
return provider->name;
else
return "unknown";
}
APR_DECLARE(apr_status_t) apr_pollset_create(apr_pollset_t **pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
apr_pollset_method_e method = APR_POLLSET_DEFAULT;
return apr_pollset_create_ex(pollset, size, p, flags, method);
}
APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t * pollset)
{
if (pollset->flags & APR_POLLSET_WAKEABLE ||
pollset->provider->cleanup)
return apr_pool_cleanup_run(pollset->pool, pollset,
pollset_cleanup);
else
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_wakeup(apr_pollset_t *pollset)
{
if (!(pollset->flags & APR_POLLSET_WAKEABLE))
return APR_EINIT;
if (apr_atomic_cas32(&pollset->wakeup_set, 1, 0) == 0)
return apr_file_putc(1, pollset->wakeup_pipe[1]);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
return (*pollset->provider->add)(pollset, descriptor);
}
APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
return (*pollset->provider->remove)(pollset, descriptor);
}
APR_DECLARE(apr_status_t) apr_pollset_poll(apr_pollset_t *pollset,
apr_interval_time_t timeout,
apr_int32_t *num,
const apr_pollfd_t **descriptors)
{
return (*pollset->provider->poll)(pollset, timeout, num, descriptors);
}
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