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-rw-r--r--poll/unix/poll.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/poll/unix/poll.c b/poll/unix/poll.c
new file mode 100644
index 0000000..5b878f1
--- /dev/null
+++ b/poll/unix/poll.c
@@ -0,0 +1,460 @@
+/* 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 + 1]; /* +1 since allocating 0 is undefined behaviour */
+#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;
+
+ *num = 0;
+
+#ifdef WIN32
+ /* WSAPoll() requires at least one socket. */
+ if (pollset->nelts == 0) {
+ if (timeout > 0) {
+ apr_sleep(timeout);
+ return APR_TIMEUP;
+ }
+ return APR_SUCCESS;
+ }
+ if (timeout > 0) {
+ timeout /= 1000;
+ }
+ ret = WSAPoll(pollset->p->pollset, pollset->nelts, (int)timeout);
+#else
+ if (timeout > 0) {
+ timeout /= 1000;
+ }
+ ret = poll(pollset->p->pollset, pollset->nelts, timeout);
+#endif
+ 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_poll_drain_wakeup_pipe(pollset->wakeup_pipe);
+ 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)) { /* any event besides wakeup pipe? */
+ rv = APR_SUCCESS;
+ }
+ }
+ if (descriptors && (*num))
+ *descriptors = pollset->p->result_set;
+ return rv;
+}
+
+static const apr_pollset_provider_t impl = {
+ impl_pollset_create,
+ impl_pollset_add,
+ impl_pollset_remove,
+ impl_pollset_poll,
+ NULL,
+ "poll"
+};
+
+const 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;
+
+#ifdef WIN32
+ /* WSAPoll() requires at least one socket. */
+ if (pollcb->nelts == 0) {
+ if (timeout > 0) {
+ apr_sleep(timeout);
+ return APR_TIMEUP;
+ }
+ return APR_SUCCESS;
+ }
+ if (timeout > 0) {
+ timeout /= 1000;
+ }
+ ret = WSAPoll(pollcb->pollset.ps, pollcb->nelts, (int)timeout);
+#else
+ if (timeout > 0) {
+ timeout /= 1000;
+ }
+ 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];
+
+ if ((pollcb->flags & APR_POLLSET_WAKEABLE) &&
+ pollfd->desc_type == APR_POLL_FILE &&
+ pollfd->desc.f == pollcb->wakeup_pipe[0]) {
+ apr_poll_drain_wakeup_pipe(pollcb->wakeup_pipe);
+ return APR_EINTR;
+ }
+
+ pollfd->rtnevents = get_revent(pollcb->pollset.ps[i].revents);
+ rv = func(baton, pollfd);
+ if (rv) {
+ return rv;
+ }
+ }
+ }
+ }
+ return rv;
+}
+
+static const apr_pollcb_provider_t impl_cb = {
+ impl_pollcb_create,
+ impl_pollcb_add,
+ impl_pollcb_remove,
+ impl_pollcb_poll,
+ NULL,
+ "poll"
+};
+
+const apr_pollcb_provider_t *apr_pollcb_provider_poll = &impl_cb;
+
+#endif /* HAVE_POLL */
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