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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.
*/
#include "apr_arch_poll_private.h"
#if defined(POLL_USES_POLL) || defined(POLLSET_USES_POLL)
static apr_int16_t get_event(apr_int16_t event)
{
apr_int16_t rv = 0;
if (event & APR_POLLIN)
rv |= POLLIN;
if (event & APR_POLLPRI)
rv |= POLLPRI;
if (event & APR_POLLOUT)
rv |= POLLOUT;
if (event & APR_POLLERR)
rv |= POLLERR;
if (event & APR_POLLHUP)
rv |= POLLHUP;
if (event & APR_POLLNVAL)
rv |= POLLNVAL;
return rv;
}
static apr_int16_t get_revent(apr_int16_t event)
{
apr_int16_t rv = 0;
if (event & POLLIN)
rv |= APR_POLLIN;
if (event & POLLPRI)
rv |= APR_POLLPRI;
if (event & POLLOUT)
rv |= APR_POLLOUT;
if (event & POLLERR)
rv |= APR_POLLERR;
if (event & POLLHUP)
rv |= APR_POLLHUP;
if (event & POLLNVAL)
rv |= APR_POLLNVAL;
return rv;
}
#endif /* POLL_USES_POLL || POLLSET_USES_POLL */
#ifdef POLL_USES_POLL
#define SMALL_POLLSET_LIMIT 8
APR_DECLARE(apr_status_t) apr_poll(apr_pollfd_t *aprset, apr_int32_t num,
apr_int32_t *nsds,
apr_interval_time_t timeout)
{
int i, num_to_poll;
#ifdef HAVE_VLA
/* XXX: I trust that this is a segv when insufficient stack exists? */
struct pollfd pollset[num];
#elif defined(HAVE_ALLOCA)
struct pollfd *pollset = alloca(sizeof(struct pollfd) * num);
if (!pollset)
return APR_ENOMEM;
#else
struct pollfd tmp_pollset[SMALL_POLLSET_LIMIT];
struct pollfd *pollset;
if (num <= SMALL_POLLSET_LIMIT) {
pollset = tmp_pollset;
}
else {
/* This does require O(n) to copy the descriptors to the internal
* mapping.
*/
pollset = malloc(sizeof(struct pollfd) * num);
/* The other option is adding an apr_pool_abort() fn to invoke
* the pool's out of memory handler
*/
if (!pollset)
return APR_ENOMEM;
}
#endif
for (i = 0; i < num; i++) {
if (aprset[i].desc_type == APR_POLL_SOCKET) {
pollset[i].fd = aprset[i].desc.s->socketdes;
}
else if (aprset[i].desc_type == APR_POLL_FILE) {
pollset[i].fd = aprset[i].desc.f->filedes;
}
else {
break;
}
pollset[i].events = get_event(aprset[i].reqevents);
}
num_to_poll = i;
if (timeout > 0) {
timeout /= 1000; /* convert microseconds to milliseconds */
}
i = poll(pollset, num_to_poll, timeout);
(*nsds) = i;
if (i > 0) { /* poll() sets revents only if an event was signalled;
* we don't promise to set rtnevents unless an event
* was signalled
*/
for (i = 0; i < num; i++) {
aprset[i].rtnevents = get_revent(pollset[i].revents);
}
}
#if !defined(HAVE_VLA) && !defined(HAVE_ALLOCA)
if (num > SMALL_POLLSET_LIMIT) {
free(pollset);
}
#endif
if ((*nsds) < 0) {
return apr_get_netos_error();
}
if ((*nsds) == 0) {
return APR_TIMEUP;
}
return APR_SUCCESS;
}
#endif /* POLL_USES_POLL */
#ifdef POLLSET_USES_POLL
struct apr_pollset_t
{
apr_pool_t *pool;
apr_uint32_t nelts;
apr_uint32_t nalloc;
struct pollfd *pollset;
apr_pollfd_t *query_set;
apr_pollfd_t *result_set;
};
APR_DECLARE(apr_status_t) apr_pollset_create(apr_pollset_t **pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
if (flags & APR_POLLSET_THREADSAFE) {
*pollset = NULL;
return APR_ENOTIMPL;
}
*pollset = apr_palloc(p, sizeof(**pollset));
(*pollset)->nelts = 0;
(*pollset)->nalloc = size;
(*pollset)->pool = p;
(*pollset)->pollset = apr_palloc(p, size * sizeof(struct pollfd));
(*pollset)->query_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
(*pollset)->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t *pollset)
{
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
if (pollset->nelts == pollset->nalloc) {
return APR_ENOMEM;
}
pollset->query_set[pollset->nelts] = *descriptor;
if (descriptor->desc_type == APR_POLL_SOCKET) {
pollset->pollset[pollset->nelts].fd = descriptor->desc.s->socketdes;
}
else {
pollset->pollset[pollset->nelts].fd = descriptor->desc.f->filedes;
}
pollset->pollset[pollset->nelts].events =
get_event(descriptor->reqevents);
pollset->nelts++;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
apr_uint32_t i;
for (i = 0; i < pollset->nelts; i++) {
if (descriptor->desc.s == pollset->query_set[i].desc.s) {
/* Found an instance of the fd: remove this and any other copies */
apr_uint32_t dst = i;
apr_uint32_t old_nelts = pollset->nelts;
pollset->nelts--;
for (i++; i < old_nelts; i++) {
if (descriptor->desc.s == pollset->query_set[i].desc.s) {
pollset->nelts--;
}
else {
pollset->pollset[dst] = pollset->pollset[i];
pollset->query_set[dst] = pollset->query_set[i];
dst++;
}
}
return APR_SUCCESS;
}
}
return APR_NOTFOUND;
}
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)
{
int rv;
apr_uint32_t i, j;
if (timeout > 0) {
timeout /= 1000;
}
rv = poll(pollset->pollset, pollset->nelts, timeout);
(*num) = rv;
if (rv < 0) {
return apr_get_netos_error();
}
if (rv == 0) {
return APR_TIMEUP;
}
j = 0;
for (i = 0; i < pollset->nelts; i++) {
if (pollset->pollset[i].revents != 0) {
pollset->result_set[j] = pollset->query_set[i];
pollset->result_set[j].rtnevents =
get_revent(pollset->pollset[i].revents);
j++;
}
}
if (descriptors)
*descriptors = pollset->result_set;
return APR_SUCCESS;
}
#endif /* POLLSET_USES_POLL */
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