| /* 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.h" |
| #include "apr_poll.h" |
| #include "apr_time.h" |
| #include "apr_portable.h" |
| #include "apr_arch_file_io.h" |
| #include "apr_arch_networkio.h" |
| #include "apr_arch_misc.h" |
| #include "apr_arch_poll_private.h" |
| |
| #if defined(HAVE_POLL) |
| |
| #ifdef HAVE_ALLOCA_H |
| #include <alloca.h> |
| #endif |
| |
| 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; |
| /* POLLERR, POLLHUP, and POLLNVAL aren't valid as requested events */ |
| |
| 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; |
| } |
| |
| #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 */ |
| |
| struct apr_pollset_private_t |
| { |
| struct pollfd *pollset; |
| apr_pollfd_t *query_set; |
| apr_pollfd_t *result_set; |
| }; |
| |
| static apr_status_t impl_pollset_create(apr_pollset_t *pollset, |
| apr_uint32_t size, |
| apr_pool_t *p, |
| apr_uint32_t flags) |
| { |
| if (flags & APR_POLLSET_THREADSAFE) { |
| return APR_ENOTIMPL; |
| } |
| #ifdef WIN32 |
| if (!APR_HAVE_LATE_DLL_FUNC(WSAPoll)) { |
| return APR_ENOTIMPL; |
| } |
| #endif |
| pollset->p = apr_palloc(p, sizeof(apr_pollset_private_t)); |
| pollset->p->pollset = apr_palloc(p, size * sizeof(struct pollfd)); |
| pollset->p->query_set = apr_palloc(p, size * sizeof(apr_pollfd_t)); |
| pollset->p->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t)); |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t impl_pollset_add(apr_pollset_t *pollset, |
| const apr_pollfd_t *descriptor) |
| { |
| if (pollset->nelts == pollset->nalloc) { |
| return APR_ENOMEM; |
| } |
| |
| pollset->p->query_set[pollset->nelts] = *descriptor; |
| |
| if (descriptor->desc_type == APR_POLL_SOCKET) { |
| pollset->p->pollset[pollset->nelts].fd = descriptor->desc.s->socketdes; |
| } |
| else { |
| #if APR_FILES_AS_SOCKETS |
| pollset->p->pollset[pollset->nelts].fd = descriptor->desc.f->filedes; |
| #else |
| if ((pollset->flags & APR_POLLSET_WAKEABLE) && |
| descriptor->desc.f == pollset->wakeup_pipe[0]) |
| pollset->p->pollset[pollset->nelts].fd = (SOCKET)descriptor->desc.f->filedes; |
| else |
| return APR_EBADF; |
| #endif |
| } |
| pollset->p->pollset[pollset->nelts].events = |
| get_event(descriptor->reqevents); |
| pollset->nelts++; |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t impl_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->p->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->p->query_set[i].desc.s) { |
| pollset->nelts--; |
| } |
| else { |
| pollset->p->pollset[dst] = pollset->p->pollset[i]; |
| pollset->p->query_set[dst] = pollset->p->query_set[i]; |
| dst++; |
| } |
| } |
| return APR_SUCCESS; |
| } |
| } |
| |
| return APR_NOTFOUND; |
| } |
| |
| static apr_status_t impl_pollset_poll(apr_pollset_t *pollset, |
| apr_interval_time_t timeout, |
| apr_int32_t *num, |
| const apr_pollfd_t **descriptors) |
| { |
| int ret; |
| apr_status_t rv = APR_SUCCESS; |
| #ifdef WIN32 |
| apr_interval_time_t orig_timeout = timeout; |
| #endif |
| |
| if (timeout > 0) { |
| timeout /= 1000; |
| } |
| #ifdef WIN32 |
| /* WSAPoll() requires at least one socket. */ |
| if (pollset->nelts == 0) { |
| *num = 0; |
| if (orig_timeout > 0) { |
| apr_sleep(orig_timeout); |
| return APR_TIMEUP; |
| } |
| return APR_SUCCESS; |
| } |
| |
| ret = WSAPoll(pollset->p->pollset, pollset->nelts, (int)timeout); |
| #else |
| ret = poll(pollset->p->pollset, pollset->nelts, timeout); |
| #endif |
| (*num) = ret; |
| if (ret < 0) { |
| return apr_get_netos_error(); |
| } |
| else if (ret == 0) { |
| return APR_TIMEUP; |
| } |
| else { |
| apr_uint32_t i, j; |
| |
| for (i = 0, j = 0; i < pollset->nelts; i++) { |
| if (pollset->p->pollset[i].revents != 0) { |
| /* Check if the polled descriptor is our |
| * wakeup pipe. In that case do not put it result set. |
| */ |
| if ((pollset->flags & APR_POLLSET_WAKEABLE) && |
| pollset->p->query_set[i].desc_type == APR_POLL_FILE && |
| pollset->p->query_set[i].desc.f == pollset->wakeup_pipe[0]) { |
| apr_pollset_drain_wakeup_pipe(pollset); |
| rv = APR_EINTR; |
| } |
| else { |
| pollset->p->result_set[j] = pollset->p->query_set[i]; |
| pollset->p->result_set[j].rtnevents = |
| get_revent(pollset->p->pollset[i].revents); |
| j++; |
| } |
| } |
| } |
| if (((*num) = j) > 0) |
| rv = APR_SUCCESS; |
| } |
| if (descriptors && (*num)) |
| *descriptors = pollset->p->result_set; |
| return rv; |
| } |
| |
| static apr_pollset_provider_t impl = { |
| impl_pollset_create, |
| impl_pollset_add, |
| impl_pollset_remove, |
| impl_pollset_poll, |
| NULL, |
| "poll" |
| }; |
| |
| apr_pollset_provider_t *apr_pollset_provider_poll = &impl; |
| |
| /* Poll method pollcb. |
| * This is probably usable only for WIN32 having WSAPoll |
| */ |
| static apr_status_t impl_pollcb_create(apr_pollcb_t *pollcb, |
| apr_uint32_t size, |
| apr_pool_t *p, |
| apr_uint32_t flags) |
| { |
| #if APR_HAS_THREADS |
| return APR_ENOTIMPL; |
| #else |
| pollcb->fd = -1; |
| #ifdef WIN32 |
| if (!APR_HAVE_LATE_DLL_FUNC(WSAPoll)) { |
| return APR_ENOTIMPL; |
| } |
| #endif |
| |
| pollcb->pollset.ps = apr_palloc(p, size * sizeof(struct pollfd)); |
| pollcb->copyset = apr_palloc(p, size * sizeof(apr_pollfd_t *)); |
| |
| return APR_SUCCESS; |
| #endif |
| } |
| |
| static apr_status_t impl_pollcb_add(apr_pollcb_t *pollcb, |
| apr_pollfd_t *descriptor) |
| { |
| if (pollcb->nelts == pollcb->nalloc) { |
| return APR_ENOMEM; |
| } |
| |
| if (descriptor->desc_type == APR_POLL_SOCKET) { |
| pollcb->pollset.ps[pollcb->nelts].fd = descriptor->desc.s->socketdes; |
| } |
| else { |
| #if APR_FILES_AS_SOCKETS |
| pollcb->pollset.ps[pollcb->nelts].fd = descriptor->desc.f->filedes; |
| #else |
| return APR_EBADF; |
| #endif |
| } |
| |
| pollcb->pollset.ps[pollcb->nelts].events = |
| get_event(descriptor->reqevents); |
| pollcb->copyset[pollcb->nelts] = descriptor; |
| pollcb->nelts++; |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t impl_pollcb_remove(apr_pollcb_t *pollcb, |
| apr_pollfd_t *descriptor) |
| { |
| apr_uint32_t i; |
| |
| for (i = 0; i < pollcb->nelts; i++) { |
| if (descriptor->desc.s == pollcb->copyset[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 = pollcb->nelts; |
| pollcb->nelts--; |
| for (i++; i < old_nelts; i++) { |
| if (descriptor->desc.s == pollcb->copyset[i]->desc.s) { |
| pollcb->nelts--; |
| } |
| else { |
| pollcb->pollset.ps[dst] = pollcb->pollset.ps[i]; |
| pollcb->copyset[dst] = pollcb->copyset[i]; |
| dst++; |
| } |
| } |
| return APR_SUCCESS; |
| } |
| } |
| |
| return APR_NOTFOUND; |
| } |
| |
| static apr_status_t impl_pollcb_poll(apr_pollcb_t *pollcb, |
| apr_interval_time_t timeout, |
| apr_pollcb_cb_t func, |
| void *baton) |
| { |
| int ret; |
| apr_status_t rv = APR_SUCCESS; |
| apr_uint32_t i; |
| |
| if (timeout > 0) { |
| timeout /= 1000; |
| } |
| #ifdef WIN32 |
| ret = WSAPoll(pollcb->pollset.ps, pollcb->nelts, (int)timeout); |
| #else |
| ret = poll(pollcb->pollset.ps, pollcb->nelts, timeout); |
| #endif |
| if (ret < 0) { |
| return apr_get_netos_error(); |
| } |
| else if (ret == 0) { |
| return APR_TIMEUP; |
| } |
| else { |
| for (i = 0; i < pollcb->nelts; i++) { |
| if (pollcb->pollset.ps[i].revents != 0) { |
| apr_pollfd_t *pollfd = pollcb->copyset[i]; |
| pollfd->rtnevents = get_revent(pollcb->pollset.ps[i].revents); |
| rv = func(baton, pollfd); |
| if (rv) { |
| return rv; |
| } |
| } |
| } |
| } |
| return rv; |
| } |
| |
| static apr_pollcb_provider_t impl_cb = { |
| impl_pollcb_create, |
| impl_pollcb_add, |
| impl_pollcb_remove, |
| impl_pollcb_poll, |
| "poll" |
| }; |
| |
| apr_pollcb_provider_t *apr_pollcb_provider_poll = &impl_cb; |
| |
| #endif /* HAVE_POLL */ |
