451 lines
13 KiB
C
451 lines
13 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr.h"
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#include "apr_poll.h"
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#include "apr_time.h"
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#include "apr_portable.h"
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#include "apr_arch_file_io.h"
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#include "apr_arch_networkio.h"
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#include "apr_arch_misc.h"
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#include "apr_arch_poll_private.h"
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#if defined(HAVE_POLL)
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#ifdef HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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static apr_int16_t get_event(apr_int16_t event)
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{
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apr_int16_t rv = 0;
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if (event & APR_POLLIN)
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rv |= POLLIN;
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if (event & APR_POLLPRI)
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rv |= POLLPRI;
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if (event & APR_POLLOUT)
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rv |= POLLOUT;
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/* POLLERR, POLLHUP, and POLLNVAL aren't valid as requested events */
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return rv;
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}
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static apr_int16_t get_revent(apr_int16_t event)
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{
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apr_int16_t rv = 0;
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if (event & POLLIN)
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rv |= APR_POLLIN;
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if (event & POLLPRI)
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rv |= APR_POLLPRI;
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if (event & POLLOUT)
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rv |= APR_POLLOUT;
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if (event & POLLERR)
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rv |= APR_POLLERR;
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if (event & POLLHUP)
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rv |= APR_POLLHUP;
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if (event & POLLNVAL)
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rv |= APR_POLLNVAL;
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return rv;
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}
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#ifdef POLL_USES_POLL
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#define SMALL_POLLSET_LIMIT 8
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APR_DECLARE(apr_status_t) apr_poll(apr_pollfd_t *aprset, apr_int32_t num,
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apr_int32_t *nsds,
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apr_interval_time_t timeout)
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{
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int i, num_to_poll;
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#ifdef HAVE_VLA
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/* XXX: I trust that this is a segv when insufficient stack exists? */
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struct pollfd pollset[num];
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#elif defined(HAVE_ALLOCA)
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struct pollfd *pollset = alloca(sizeof(struct pollfd) * num);
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if (!pollset)
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return APR_ENOMEM;
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#else
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struct pollfd tmp_pollset[SMALL_POLLSET_LIMIT];
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struct pollfd *pollset;
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if (num <= SMALL_POLLSET_LIMIT) {
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pollset = tmp_pollset;
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}
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else {
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/* This does require O(n) to copy the descriptors to the internal
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* mapping.
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*/
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pollset = malloc(sizeof(struct pollfd) * num);
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/* The other option is adding an apr_pool_abort() fn to invoke
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* the pool's out of memory handler
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*/
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if (!pollset)
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return APR_ENOMEM;
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}
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#endif
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for (i = 0; i < num; i++) {
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if (aprset[i].desc_type == APR_POLL_SOCKET) {
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pollset[i].fd = aprset[i].desc.s->socketdes;
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}
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else if (aprset[i].desc_type == APR_POLL_FILE) {
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pollset[i].fd = aprset[i].desc.f->filedes;
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}
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else {
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break;
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}
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pollset[i].events = get_event(aprset[i].reqevents);
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}
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num_to_poll = i;
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if (timeout > 0) {
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timeout /= 1000; /* convert microseconds to milliseconds */
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}
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i = poll(pollset, num_to_poll, timeout);
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(*nsds) = i;
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if (i > 0) { /* poll() sets revents only if an event was signalled;
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* we don't promise to set rtnevents unless an event
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* was signalled
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*/
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for (i = 0; i < num; i++) {
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aprset[i].rtnevents = get_revent(pollset[i].revents);
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}
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}
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#if !defined(HAVE_VLA) && !defined(HAVE_ALLOCA)
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if (num > SMALL_POLLSET_LIMIT) {
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free(pollset);
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}
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#endif
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if ((*nsds) < 0) {
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return apr_get_netos_error();
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}
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if ((*nsds) == 0) {
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return APR_TIMEUP;
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}
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return APR_SUCCESS;
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}
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#endif /* POLL_USES_POLL */
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struct apr_pollset_private_t
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{
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struct pollfd *pollset;
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apr_pollfd_t *query_set;
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apr_pollfd_t *result_set;
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};
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static apr_status_t impl_pollset_create(apr_pollset_t *pollset,
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apr_uint32_t size,
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apr_pool_t *p,
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apr_uint32_t flags)
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{
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if (flags & APR_POLLSET_THREADSAFE) {
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return APR_ENOTIMPL;
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}
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#ifdef WIN32
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if (!APR_HAVE_LATE_DLL_FUNC(WSAPoll)) {
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return APR_ENOTIMPL;
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}
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#endif
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pollset->p = apr_palloc(p, sizeof(apr_pollset_private_t));
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pollset->p->pollset = apr_palloc(p, size * sizeof(struct pollfd));
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pollset->p->query_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
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pollset->p->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
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return APR_SUCCESS;
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}
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static apr_status_t impl_pollset_add(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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if (pollset->nelts == pollset->nalloc) {
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return APR_ENOMEM;
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}
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pollset->p->query_set[pollset->nelts] = *descriptor;
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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pollset->p->pollset[pollset->nelts].fd = descriptor->desc.s->socketdes;
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}
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else {
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#if APR_FILES_AS_SOCKETS
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pollset->p->pollset[pollset->nelts].fd = descriptor->desc.f->filedes;
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#else
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if ((pollset->flags & APR_POLLSET_WAKEABLE) &&
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descriptor->desc.f == pollset->wakeup_pipe[0])
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pollset->p->pollset[pollset->nelts].fd = (SOCKET)descriptor->desc.f->filedes;
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else
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return APR_EBADF;
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#endif
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}
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pollset->p->pollset[pollset->nelts].events =
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get_event(descriptor->reqevents);
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pollset->nelts++;
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return APR_SUCCESS;
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}
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static apr_status_t impl_pollset_remove(apr_pollset_t *pollset,
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const apr_pollfd_t *descriptor)
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{
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apr_uint32_t i;
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for (i = 0; i < pollset->nelts; i++) {
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if (descriptor->desc.s == pollset->p->query_set[i].desc.s) {
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/* Found an instance of the fd: remove this and any other copies */
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apr_uint32_t dst = i;
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apr_uint32_t old_nelts = pollset->nelts;
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pollset->nelts--;
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for (i++; i < old_nelts; i++) {
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if (descriptor->desc.s == pollset->p->query_set[i].desc.s) {
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pollset->nelts--;
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}
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else {
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pollset->p->pollset[dst] = pollset->p->pollset[i];
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pollset->p->query_set[dst] = pollset->p->query_set[i];
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dst++;
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}
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}
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return APR_SUCCESS;
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}
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}
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return APR_NOTFOUND;
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}
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static apr_status_t impl_pollset_poll(apr_pollset_t *pollset,
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apr_interval_time_t timeout,
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apr_int32_t *num,
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const apr_pollfd_t **descriptors)
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{
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int ret;
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apr_status_t rv = APR_SUCCESS;
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#ifdef WIN32
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/* WSAPoll() requires at least one socket. */
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if (pollset->nelts == 0) {
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*num = 0;
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if (timeout > 0) {
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apr_sleep(timeout);
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return APR_TIMEUP;
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}
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return APR_SUCCESS;
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}
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if (timeout > 0) {
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timeout /= 1000;
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}
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ret = WSAPoll(pollset->p->pollset, pollset->nelts, (int)timeout);
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#else
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if (timeout > 0) {
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timeout /= 1000;
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}
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ret = poll(pollset->p->pollset, pollset->nelts, timeout);
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#endif
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(*num) = ret;
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if (ret < 0) {
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return apr_get_netos_error();
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}
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else if (ret == 0) {
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return APR_TIMEUP;
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}
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else {
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apr_uint32_t i, j;
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for (i = 0, j = 0; i < pollset->nelts; i++) {
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if (pollset->p->pollset[i].revents != 0) {
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/* Check if the polled descriptor is our
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* wakeup pipe. In that case do not put it result set.
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*/
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if ((pollset->flags & APR_POLLSET_WAKEABLE) &&
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pollset->p->query_set[i].desc_type == APR_POLL_FILE &&
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pollset->p->query_set[i].desc.f == pollset->wakeup_pipe[0]) {
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apr_pollset_drain_wakeup_pipe(pollset);
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rv = APR_EINTR;
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}
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else {
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pollset->p->result_set[j] = pollset->p->query_set[i];
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pollset->p->result_set[j].rtnevents =
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get_revent(pollset->p->pollset[i].revents);
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j++;
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}
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}
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}
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if (((*num) = j) > 0)
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rv = APR_SUCCESS;
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}
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if (descriptors && (*num))
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*descriptors = pollset->p->result_set;
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return rv;
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}
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static apr_pollset_provider_t impl = {
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impl_pollset_create,
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impl_pollset_add,
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impl_pollset_remove,
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impl_pollset_poll,
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NULL,
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"poll"
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};
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apr_pollset_provider_t *apr_pollset_provider_poll = &impl;
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/* Poll method pollcb.
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* This is probably usable only for WIN32 having WSAPoll
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*/
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static apr_status_t impl_pollcb_create(apr_pollcb_t *pollcb,
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apr_uint32_t size,
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apr_pool_t *p,
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apr_uint32_t flags)
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{
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#if APR_HAS_THREADS
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return APR_ENOTIMPL;
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#else
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pollcb->fd = -1;
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#ifdef WIN32
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if (!APR_HAVE_LATE_DLL_FUNC(WSAPoll)) {
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return APR_ENOTIMPL;
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}
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#endif
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pollcb->pollset.ps = apr_palloc(p, size * sizeof(struct pollfd));
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pollcb->copyset = apr_palloc(p, size * sizeof(apr_pollfd_t *));
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return APR_SUCCESS;
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#endif
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}
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static apr_status_t impl_pollcb_add(apr_pollcb_t *pollcb,
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apr_pollfd_t *descriptor)
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{
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if (pollcb->nelts == pollcb->nalloc) {
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return APR_ENOMEM;
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}
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if (descriptor->desc_type == APR_POLL_SOCKET) {
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pollcb->pollset.ps[pollcb->nelts].fd = descriptor->desc.s->socketdes;
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}
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else {
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#if APR_FILES_AS_SOCKETS
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pollcb->pollset.ps[pollcb->nelts].fd = descriptor->desc.f->filedes;
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#else
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return APR_EBADF;
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#endif
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}
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pollcb->pollset.ps[pollcb->nelts].events =
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get_event(descriptor->reqevents);
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pollcb->copyset[pollcb->nelts] = descriptor;
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pollcb->nelts++;
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return APR_SUCCESS;
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}
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static apr_status_t impl_pollcb_remove(apr_pollcb_t *pollcb,
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apr_pollfd_t *descriptor)
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{
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apr_uint32_t i;
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for (i = 0; i < pollcb->nelts; i++) {
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if (descriptor->desc.s == pollcb->copyset[i]->desc.s) {
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/* Found an instance of the fd: remove this and any other copies */
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apr_uint32_t dst = i;
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apr_uint32_t old_nelts = pollcb->nelts;
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pollcb->nelts--;
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for (i++; i < old_nelts; i++) {
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if (descriptor->desc.s == pollcb->copyset[i]->desc.s) {
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pollcb->nelts--;
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}
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else {
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pollcb->pollset.ps[dst] = pollcb->pollset.ps[i];
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pollcb->copyset[dst] = pollcb->copyset[i];
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dst++;
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}
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}
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return APR_SUCCESS;
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}
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}
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return APR_NOTFOUND;
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}
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static apr_status_t impl_pollcb_poll(apr_pollcb_t *pollcb,
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apr_interval_time_t timeout,
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apr_pollcb_cb_t func,
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void *baton)
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{
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int ret;
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apr_status_t rv = APR_SUCCESS;
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apr_uint32_t i;
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#ifdef WIN32
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/* WSAPoll() requires at least one socket. */
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if (pollcb->nelts == 0) {
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if (timeout > 0) {
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apr_sleep(timeout);
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return APR_TIMEUP;
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}
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return APR_SUCCESS;
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}
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if (timeout > 0) {
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timeout /= 1000;
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}
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ret = WSAPoll(pollcb->pollset.ps, pollcb->nelts, (int)timeout);
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#else
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if (timeout > 0) {
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timeout /= 1000;
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}
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ret = poll(pollcb->pollset.ps, pollcb->nelts, timeout);
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#endif
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if (ret < 0) {
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return apr_get_netos_error();
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}
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else if (ret == 0) {
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return APR_TIMEUP;
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}
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else {
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for (i = 0; i < pollcb->nelts; i++) {
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if (pollcb->pollset.ps[i].revents != 0) {
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apr_pollfd_t *pollfd = pollcb->copyset[i];
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pollfd->rtnevents = get_revent(pollcb->pollset.ps[i].revents);
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rv = func(baton, pollfd);
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if (rv) {
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return rv;
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}
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}
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}
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}
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return rv;
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}
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static apr_pollcb_provider_t impl_cb = {
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impl_pollcb_create,
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impl_pollcb_add,
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impl_pollcb_remove,
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impl_pollcb_poll,
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"poll"
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};
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apr_pollcb_provider_t *apr_pollcb_provider_poll = &impl_cb;
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#endif /* HAVE_POLL */
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