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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"
static apr_pollset_method_e pollset_default_method = POLLSET_DEFAULT_METHOD;
#if defined(HAVE_KQUEUE)
extern const apr_pollcb_provider_t *apr_pollcb_provider_kqueue;
#endif
#if defined(HAVE_PORT_CREATE)
extern const apr_pollcb_provider_t *apr_pollcb_provider_port;
#endif
#if defined(HAVE_EPOLL)
extern const apr_pollcb_provider_t *apr_pollcb_provider_epoll;
#endif
#if defined(HAVE_POLL)
extern const apr_pollcb_provider_t *apr_pollcb_provider_poll;
#endif
static const apr_pollcb_provider_t *pollcb_provider(apr_pollset_method_e method)
{
const apr_pollcb_provider_t *provider = NULL;
switch (method) {
case APR_POLLSET_KQUEUE:
#if defined(HAVE_KQUEUE)
provider = apr_pollcb_provider_kqueue;
#endif
break;
case APR_POLLSET_PORT:
#if defined(HAVE_PORT_CREATE)
provider = apr_pollcb_provider_port;
#endif
break;
case APR_POLLSET_EPOLL:
#if defined(HAVE_EPOLL)
provider = apr_pollcb_provider_epoll;
#endif
break;
case APR_POLLSET_POLL:
#if defined(HAVE_POLL)
provider = apr_pollcb_provider_poll;
#endif
break;
case APR_POLLSET_SELECT:
case APR_POLLSET_AIO_MSGQ:
case APR_POLLSET_DEFAULT:
break;
}
return provider;
}
static apr_status_t pollcb_cleanup(void *p)
{
apr_pollcb_t *pollcb = (apr_pollcb_t *) p;
if (pollcb->provider->cleanup) {
(*pollcb->provider->cleanup)(pollcb);
}
if (pollcb->flags & APR_POLLSET_WAKEABLE) {
#if WAKEUP_USES_PIPE
apr_poll_close_wakeup_pipe(pollcb->wakeup_pipe);
#else
apr_poll_close_wakeup_socket(pollcb->wakeup_socket);
#endif
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollcb_create_ex(apr_pollcb_t **ret_pollcb,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags,
apr_pollset_method_e method)
{
apr_status_t rv;
apr_pollcb_t *pollcb;
const apr_pollcb_provider_t *provider = NULL;
*ret_pollcb = NULL;
#ifdef WIN32
/* This will work only if ws2_32.dll has WSAPoll funtion.
* We could check the presence of the function here,
* but someone might implement other pollcb method in
* the future.
*/
if (method == APR_POLLSET_DEFAULT) {
method = APR_POLLSET_POLL;
}
#endif
if (method == APR_POLLSET_DEFAULT)
method = pollset_default_method;
while (provider == NULL) {
provider = pollcb_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++;
}
pollcb = apr_palloc(p, sizeof(*pollcb));
pollcb->nelts = 0;
pollcb->nalloc = size;
pollcb->flags = flags;
pollcb->pool = p;
pollcb->provider = provider;
pollcb->wakeup_set = 0;
rv = (*provider->create)(pollcb, size, p, flags);
if (rv == APR_ENOTIMPL) {
if (method == pollset_default_method) {
return rv;
}
if ((flags & APR_POLLSET_NODEFAULT) == APR_POLLSET_NODEFAULT) {
return rv;
}
/* Try with default provider */
provider = pollcb_provider(pollset_default_method);
if (!provider) {
return APR_ENOTIMPL;
}
rv = (*provider->create)(pollcb, size, p, flags);
if (rv != APR_SUCCESS) {
return rv;
}
pollcb->provider = provider;
}
else if (rv != APR_SUCCESS) {
return rv;
}
if (flags & APR_POLLSET_WAKEABLE) {
#if WAKEUP_USES_PIPE
/* Create wakeup pipe */
if ((rv = apr_poll_create_wakeup_pipe(pollcb->pool, &pollcb->wakeup_pfd,
pollcb->wakeup_pipe))
!= APR_SUCCESS) {
return rv;
}
#else
/* Create wakeup socket */
if ((rv = apr_poll_create_wakeup_socket(pollcb->pool, &pollcb->wakeup_pfd,
pollcb->wakeup_socket))
!= APR_SUCCESS) {
return rv;
}
#endif
if ((rv = apr_pollcb_add(pollcb, &pollcb->wakeup_pfd)) != APR_SUCCESS) {
return rv;
}
}
if ((flags & APR_POLLSET_WAKEABLE) || provider->cleanup)
apr_pool_cleanup_register(p, pollcb, pollcb_cleanup,
apr_pool_cleanup_null);
*ret_pollcb = pollcb;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollcb_create(apr_pollcb_t **pollcb,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
apr_pollset_method_e method = APR_POLLSET_DEFAULT;
return apr_pollcb_create_ex(pollcb, size, p, flags, method);
}
APR_DECLARE(apr_status_t) apr_pollcb_add(apr_pollcb_t *pollcb,
apr_pollfd_t *descriptor)
{
return (*pollcb->provider->add)(pollcb, descriptor);
}
APR_DECLARE(apr_status_t) apr_pollcb_remove(apr_pollcb_t *pollcb,
apr_pollfd_t *descriptor)
{
return (*pollcb->provider->remove)(pollcb, descriptor);
}
APR_DECLARE(apr_status_t) apr_pollcb_poll(apr_pollcb_t *pollcb,
apr_interval_time_t timeout,
apr_pollcb_cb_t func,
void *baton)
{
return (*pollcb->provider->poll)(pollcb, timeout, func, baton);
}
APR_DECLARE(apr_status_t) apr_pollcb_wakeup(apr_pollcb_t *pollcb)
{
if (!(pollcb->flags & APR_POLLSET_WAKEABLE))
return APR_EINIT;
if (apr_atomic_cas32(&pollcb->wakeup_set, 1, 0) == 0) {
#if WAKEUP_USES_PIPE
return apr_file_putc(1, pollcb->wakeup_pipe[1]);
#else
apr_size_t len = 1;
return apr_socket_send(pollcb->wakeup_socket[1], "\1", &len);
#endif
}
return APR_SUCCESS;
}
APR_DECLARE(const char *) apr_pollcb_method_name(apr_pollcb_t *pollcb)
{
return pollcb->provider->name;
}
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