summaryrefslogtreecommitdiffstats
path: root/poll/unix/port.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--poll/unix/port.c594
1 files changed, 594 insertions, 0 deletions
diff --git a/poll/unix/port.c b/poll/unix/port.c
new file mode 100644
index 0000000..c1e5994
--- /dev/null
+++ b/poll/unix/port.c
@@ -0,0 +1,594 @@
+/* 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_atomic.h"
+#include "apr_arch_file_io.h"
+#include "apr_arch_networkio.h"
+#include "apr_arch_poll_private.h"
+#include "apr_arch_inherit.h"
+
+#if defined(HAVE_PORT_CREATE)
+
+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;
+}
+
+
+struct apr_pollset_private_t
+{
+ int port_fd;
+ port_event_t *port_set;
+ apr_pollfd_t *result_set;
+#if APR_HAS_THREADS
+ /* A thread mutex to protect operations on the rings */
+ apr_thread_mutex_t *ring_lock;
+#endif
+ /* A ring containing all of the pollfd_t that are active */
+ APR_RING_HEAD(pfd_query_ring_t, pfd_elem_t) query_ring;
+ /* A ring containing the pollfd_t that will be added on the
+ * next call to apr_pollset_poll().
+ */
+ APR_RING_HEAD(pfd_add_ring_t, pfd_elem_t) add_ring;
+ /* A ring of pollfd_t that have been used, and then _remove'd */
+ APR_RING_HEAD(pfd_free_ring_t, pfd_elem_t) free_ring;
+ /* A ring of pollfd_t where rings that have been _remove'd but
+ might still be inside a _poll */
+ APR_RING_HEAD(pfd_dead_ring_t, pfd_elem_t) dead_ring;
+ /* number of threads in poll */
+ volatile apr_uint32_t waiting;
+};
+
+static apr_status_t call_port_getn(int port, port_event_t list[],
+ unsigned int max, unsigned int *nget,
+ apr_interval_time_t timeout)
+{
+ struct timespec tv, *tvptr;
+ int ret;
+ apr_status_t rv = APR_SUCCESS;
+
+ if (timeout < 0) {
+ tvptr = NULL;
+ }
+ else {
+ tv.tv_sec = (long) apr_time_sec(timeout);
+ tv.tv_nsec = (long) apr_time_usec(timeout) * 1000;
+ tvptr = &tv;
+ }
+
+ list[0].portev_user = (void *)-1; /* so we can double check that an
+ * event was returned
+ */
+
+ ret = port_getn(port, list, max, nget, tvptr);
+ /* Note: 32-bit port_getn() on Solaris 10 x86 returns large negative
+ * values instead of 0 when returning immediately.
+ */
+
+ if (ret == -1) {
+ rv = apr_get_netos_error();
+
+ switch(rv) {
+ case EINTR:
+ case ETIME:
+ if (*nget > 0 && list[0].portev_user != (void *)-1) {
+ /* This confusing API can return an event at the same time
+ * that it reports EINTR or ETIME. If that occurs, just
+ * report the event. With EINTR, nget can be > 0 without
+ * any event, so check that portev_user was filled in.
+ *
+ * (Maybe it will be simplified; see thread
+ * http://mail.opensolaris.org
+ * /pipermail/networking-discuss/2009-August/011979.html
+ * This code will still work afterwards.)
+ */
+ rv = APR_SUCCESS;
+ break;
+ }
+ if (rv == ETIME) {
+ rv = APR_TIMEUP;
+ }
+ /* fall-through */
+ default:
+ *nget = 0;
+ }
+ }
+ else if (*nget == 0) {
+ rv = APR_TIMEUP;
+ }
+
+ return rv;
+}
+
+static apr_status_t impl_pollset_cleanup(apr_pollset_t *pollset)
+{
+ close(pollset->p->port_fd);
+ return APR_SUCCESS;
+}
+
+static apr_status_t impl_pollset_create(apr_pollset_t *pollset,
+ apr_uint32_t size,
+ apr_pool_t *p,
+ apr_uint32_t flags)
+{
+ apr_status_t rv = APR_SUCCESS;
+ pollset->p = apr_palloc(p, sizeof(apr_pollset_private_t));
+#if APR_HAS_THREADS
+ if (flags & APR_POLLSET_THREADSAFE &&
+ ((rv = apr_thread_mutex_create(&pollset->p->ring_lock,
+ APR_THREAD_MUTEX_DEFAULT,
+ p)) != APR_SUCCESS)) {
+ pollset->p = NULL;
+ return rv;
+ }
+#else
+ if (flags & APR_POLLSET_THREADSAFE) {
+ pollset->p = NULL;
+ return APR_ENOTIMPL;
+ }
+#endif
+ pollset->p->waiting = 0;
+
+ pollset->p->port_set = apr_palloc(p, size * sizeof(port_event_t));
+
+ pollset->p->port_fd = port_create();
+
+ if (pollset->p->port_fd < 0) {
+ pollset->p = NULL;
+ return apr_get_netos_error();
+ }
+
+ {
+ int flags;
+
+ if ((flags = fcntl(pollset->p->port_fd, F_GETFD)) == -1) {
+ rv = errno;
+ close(pollset->p->port_fd);
+ pollset->p = NULL;
+ return rv;
+ }
+
+ flags |= FD_CLOEXEC;
+ if (fcntl(pollset->p->port_fd, F_SETFD, flags) == -1) {
+ rv = errno;
+ close(pollset->p->port_fd);
+ pollset->p = NULL;
+ return rv;
+ }
+ }
+
+ pollset->p->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
+
+ APR_RING_INIT(&pollset->p->query_ring, pfd_elem_t, link);
+ APR_RING_INIT(&pollset->p->add_ring, pfd_elem_t, link);
+ APR_RING_INIT(&pollset->p->free_ring, pfd_elem_t, link);
+ APR_RING_INIT(&pollset->p->dead_ring, pfd_elem_t, link);
+
+ return rv;
+}
+
+static apr_status_t impl_pollset_add(apr_pollset_t *pollset,
+ const apr_pollfd_t *descriptor)
+{
+ apr_os_sock_t fd;
+ pfd_elem_t *elem;
+ int res;
+ apr_status_t rv = APR_SUCCESS;
+
+ pollset_lock_rings();
+
+ if (!APR_RING_EMPTY(&(pollset->p->free_ring), pfd_elem_t, link)) {
+ elem = APR_RING_FIRST(&(pollset->p->free_ring));
+ APR_RING_REMOVE(elem, link);
+ }
+ else {
+ elem = (pfd_elem_t *) apr_palloc(pollset->pool, sizeof(pfd_elem_t));
+ APR_RING_ELEM_INIT(elem, link);
+ elem->on_query_ring = 0;
+ }
+ elem->pfd = *descriptor;
+
+ if (descriptor->desc_type == APR_POLL_SOCKET) {
+ fd = descriptor->desc.s->socketdes;
+ }
+ else {
+ fd = descriptor->desc.f->filedes;
+ }
+
+ /* If another thread is polling, notify the kernel immediately; otherwise,
+ * wait until the next call to apr_pollset_poll().
+ */
+ if (apr_atomic_read32(&pollset->p->waiting)) {
+ res = port_associate(pollset->p->port_fd, PORT_SOURCE_FD, fd,
+ get_event(descriptor->reqevents), (void *)elem);
+
+ if (res < 0) {
+ rv = apr_get_netos_error();
+ APR_RING_INSERT_TAIL(&(pollset->p->free_ring), elem, pfd_elem_t, link);
+ }
+ else {
+ elem->on_query_ring = 1;
+ APR_RING_INSERT_TAIL(&(pollset->p->query_ring), elem, pfd_elem_t, link);
+ }
+ }
+ else {
+ APR_RING_INSERT_TAIL(&(pollset->p->add_ring), elem, pfd_elem_t, link);
+ }
+
+ pollset_unlock_rings();
+
+ return rv;
+}
+
+static apr_status_t impl_pollset_remove(apr_pollset_t *pollset,
+ const apr_pollfd_t *descriptor)
+{
+ apr_os_sock_t fd;
+ pfd_elem_t *ep;
+ apr_status_t rv = APR_SUCCESS;
+ int res;
+ int err = 0;
+ int found;
+
+ pollset_lock_rings();
+
+ if (descriptor->desc_type == APR_POLL_SOCKET) {
+ fd = descriptor->desc.s->socketdes;
+ }
+ else {
+ fd = descriptor->desc.f->filedes;
+ }
+
+ /* Search the add ring first. This ring is often shorter,
+ * and it often contains the descriptor being removed.
+ * (For the common scenario where apr_pollset_poll()
+ * returns activity for the descriptor and the descriptor
+ * is then removed from the pollset, it will have just
+ * been moved to the add ring by apr_pollset_poll().)
+ *
+ * If it is on the add ring, it isn't associated with the
+ * event port yet/anymore.
+ */
+ found = 0;
+ for (ep = APR_RING_FIRST(&(pollset->p->add_ring));
+ ep != APR_RING_SENTINEL(&(pollset->p->add_ring),
+ pfd_elem_t, link);
+ ep = APR_RING_NEXT(ep, link)) {
+
+ if (descriptor->desc.s == ep->pfd.desc.s) {
+ found = 1;
+ APR_RING_REMOVE(ep, link);
+ APR_RING_INSERT_TAIL(&(pollset->p->free_ring),
+ ep, pfd_elem_t, link);
+ break;
+ }
+ }
+
+ if (!found) {
+ res = port_dissociate(pollset->p->port_fd, PORT_SOURCE_FD, fd);
+
+ if (res < 0) {
+ /* The expected case for this failure is that another
+ * thread's call to port_getn() returned this fd and
+ * disassociated the fd from the event port, and
+ * impl_pollset_poll() is blocked on the ring lock,
+ * which this thread holds.
+ */
+ err = errno;
+ rv = APR_NOTFOUND;
+ }
+
+ for (ep = APR_RING_FIRST(&(pollset->p->query_ring));
+ ep != APR_RING_SENTINEL(&(pollset->p->query_ring),
+ pfd_elem_t, link);
+ ep = APR_RING_NEXT(ep, link)) {
+
+ if (descriptor->desc.s == ep->pfd.desc.s) {
+ APR_RING_REMOVE(ep, link);
+ ep->on_query_ring = 0;
+ APR_RING_INSERT_TAIL(&(pollset->p->dead_ring),
+ ep, pfd_elem_t, link);
+ if (ENOENT == err) {
+ rv = APR_SUCCESS;
+ }
+ break;
+ }
+ }
+ }
+
+ pollset_unlock_rings();
+
+ return rv;
+}
+
+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)
+{
+ apr_os_sock_t fd;
+ int ret;
+ unsigned int nget, i;
+ apr_int32_t j;
+ pfd_elem_t *ep;
+ apr_status_t rv = APR_SUCCESS;
+
+ *num = 0;
+ nget = 1;
+
+ pollset_lock_rings();
+
+ apr_atomic_inc32(&pollset->p->waiting);
+
+ while (!APR_RING_EMPTY(&(pollset->p->add_ring), pfd_elem_t, link)) {
+ ep = APR_RING_FIRST(&(pollset->p->add_ring));
+ APR_RING_REMOVE(ep, link);
+
+ if (ep->pfd.desc_type == APR_POLL_SOCKET) {
+ fd = ep->pfd.desc.s->socketdes;
+ }
+ else {
+ fd = ep->pfd.desc.f->filedes;
+ }
+
+ ret = port_associate(pollset->p->port_fd, PORT_SOURCE_FD,
+ fd, get_event(ep->pfd.reqevents), ep);
+ if (ret < 0) {
+ rv = apr_get_netos_error();
+ APR_RING_INSERT_TAIL(&(pollset->p->free_ring), ep, pfd_elem_t, link);
+ break;
+ }
+
+ ep->on_query_ring = 1;
+ APR_RING_INSERT_TAIL(&(pollset->p->query_ring), ep, pfd_elem_t, link);
+ }
+
+ pollset_unlock_rings();
+
+ if (rv != APR_SUCCESS) {
+ apr_atomic_dec32(&pollset->p->waiting);
+ return rv;
+ }
+
+ rv = call_port_getn(pollset->p->port_fd, pollset->p->port_set,
+ pollset->nalloc, &nget, timeout);
+
+ /* decrease the waiting ASAP to reduce the window for calling
+ port_associate within apr_pollset_add() */
+ apr_atomic_dec32(&pollset->p->waiting);
+
+ pollset_lock_rings();
+
+ for (i = 0, j = 0; i < nget; i++) {
+ ep = (pfd_elem_t *)pollset->p->port_set[i].portev_user;
+ if ((pollset->flags & APR_POLLSET_WAKEABLE) &&
+ ep->pfd.desc_type == APR_POLL_FILE &&
+ ep->pfd.desc.f == pollset->wakeup_pipe[0]) {
+ apr_poll_drain_wakeup_pipe(pollset->wakeup_pipe);
+ rv = APR_EINTR;
+ }
+ else {
+ pollset->p->result_set[j] = ep->pfd;
+ pollset->p->result_set[j].rtnevents =
+ get_revent(pollset->p->port_set[i].portev_events);
+ j++;
+ }
+ /* If the ring element is still on the query ring, move it
+ * to the add ring for re-association with the event port
+ * later. (It may have already been moved to the dead ring
+ * by a call to pollset_remove on another thread.)
+ */
+ if (ep->on_query_ring) {
+ APR_RING_REMOVE(ep, link);
+ ep->on_query_ring = 0;
+ APR_RING_INSERT_TAIL(&(pollset->p->add_ring), ep,
+ pfd_elem_t, link);
+ }
+ }
+ if ((*num = j)) { /* any event besides wakeup pipe? */
+ rv = APR_SUCCESS;
+ if (descriptors) {
+ *descriptors = pollset->p->result_set;
+ }
+ }
+
+ /* Shift all PFDs in the Dead Ring to the Free Ring */
+ APR_RING_CONCAT(&(pollset->p->free_ring), &(pollset->p->dead_ring), pfd_elem_t, link);
+
+ pollset_unlock_rings();
+
+ return rv;
+}
+
+static const apr_pollset_provider_t impl = {
+ impl_pollset_create,
+ impl_pollset_add,
+ impl_pollset_remove,
+ impl_pollset_poll,
+ impl_pollset_cleanup,
+ "port"
+};
+
+const apr_pollset_provider_t *apr_pollset_provider_port = &impl;
+
+static apr_status_t impl_pollcb_cleanup(apr_pollcb_t *pollcb)
+{
+ close(pollcb->fd);
+ return APR_SUCCESS;
+}
+
+static apr_status_t impl_pollcb_create(apr_pollcb_t *pollcb,
+ apr_uint32_t size,
+ apr_pool_t *p,
+ apr_uint32_t flags)
+{
+ pollcb->fd = port_create();
+
+ if (pollcb->fd < 0) {
+ return apr_get_netos_error();
+ }
+
+ {
+ int flags;
+ apr_status_t rv;
+
+ if ((flags = fcntl(pollcb->fd, F_GETFD)) == -1) {
+ rv = errno;
+ close(pollcb->fd);
+ pollcb->fd = -1;
+ return rv;
+ }
+
+ flags |= FD_CLOEXEC;
+ if (fcntl(pollcb->fd, F_SETFD, flags) == -1) {
+ rv = errno;
+ close(pollcb->fd);
+ pollcb->fd = -1;
+ return rv;
+ }
+ }
+
+ pollcb->pollset.port = apr_palloc(p, size * sizeof(port_event_t));
+
+ return APR_SUCCESS;
+}
+
+static apr_status_t impl_pollcb_add(apr_pollcb_t *pollcb,
+ apr_pollfd_t *descriptor)
+{
+ int ret, fd;
+
+ if (descriptor->desc_type == APR_POLL_SOCKET) {
+ fd = descriptor->desc.s->socketdes;
+ }
+ else {
+ fd = descriptor->desc.f->filedes;
+ }
+
+ ret = port_associate(pollcb->fd, PORT_SOURCE_FD, fd,
+ get_event(descriptor->reqevents), descriptor);
+
+ if (ret == -1) {
+ return apr_get_netos_error();
+ }
+
+ return APR_SUCCESS;
+}
+
+static apr_status_t impl_pollcb_remove(apr_pollcb_t *pollcb,
+ apr_pollfd_t *descriptor)
+{
+ int fd, ret;
+
+ if (descriptor->desc_type == APR_POLL_SOCKET) {
+ fd = descriptor->desc.s->socketdes;
+ }
+ else {
+ fd = descriptor->desc.f->filedes;
+ }
+
+ ret = port_dissociate(pollcb->fd, PORT_SOURCE_FD, fd);
+
+ if (ret < 0) {
+ return APR_NOTFOUND;
+ }
+
+ return APR_SUCCESS;
+}
+
+static apr_status_t impl_pollcb_poll(apr_pollcb_t *pollcb,
+ apr_interval_time_t timeout,
+ apr_pollcb_cb_t func,
+ void *baton)
+{
+ apr_status_t rv;
+ unsigned int nget = 1;
+
+ rv = call_port_getn(pollcb->fd, pollcb->pollset.port, pollcb->nalloc,
+ &nget, timeout);
+
+ if (nget) {
+ unsigned int i;
+
+ for (i = 0; i < nget; i++) {
+ apr_pollfd_t *pollfd = (apr_pollfd_t *)(pollcb->pollset.port[i].portev_user);
+
+ 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.port[i].portev_events);
+
+ rv = func(baton, pollfd);
+ if (rv) {
+ return rv;
+ }
+ rv = apr_pollcb_add(pollcb, pollfd);
+ }
+ }
+
+ return rv;
+}
+
+static const apr_pollcb_provider_t impl_cb = {
+ impl_pollcb_create,
+ impl_pollcb_add,
+ impl_pollcb_remove,
+ impl_pollcb_poll,
+ impl_pollcb_cleanup,
+ "port"
+};
+
+const apr_pollcb_provider_t *apr_pollcb_provider_port = &impl_cb;
+
+#endif /* HAVE_PORT_CREATE */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 16:55:40 +0000