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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.h"
#include "apr_poll.h"
#include "apr_arch_networkio.h"
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 *pollset;
int i;
int num_read = 0, num_write = 0, num_except = 0, num_total;
int pos_read, pos_write, pos_except;
for (i = 0; i < num; i++) {
if (aprset[i].desc_type == APR_POLL_SOCKET) {
num_read += (aprset[i].reqevents & APR_POLLIN) != 0;
num_write += (aprset[i].reqevents & APR_POLLOUT) != 0;
num_except += (aprset[i].reqevents & APR_POLLPRI) != 0;
}
}
num_total = num_read + num_write + num_except;
pollset = alloca(sizeof(int) * num_total);
memset(pollset, 0, sizeof(int) * num_total);
pos_read = 0;
pos_write = num_read;
pos_except = pos_write + num_write;
for (i = 0; i < num; i++) {
if (aprset[i].desc_type == APR_POLL_SOCKET) {
if (aprset[i].reqevents & APR_POLLIN) {
pollset[pos_read++] = aprset[i].desc.s->socketdes;
}
if (aprset[i].reqevents & APR_POLLOUT) {
pollset[pos_write++] = aprset[i].desc.s->socketdes;
}
if (aprset[i].reqevents & APR_POLLPRI) {
pollset[pos_except++] = aprset[i].desc.s->socketdes;
}
aprset[i].rtnevents = 0;
}
}
if (timeout > 0) {
/* convert microseconds to milliseconds (round up) */
timeout = (timeout + 999) / 1000;
}
i = select(pollset, num_read, num_write, num_except, timeout);
(*nsds) = i;
if ((*nsds) < 0) {
return APR_FROM_OS_ERROR(sock_errno());
}
if ((*nsds) == 0) {
return APR_TIMEUP;
}
pos_read = 0;
pos_write = num_read;
pos_except = pos_write + num_write;
for (i = 0; i < num; i++) {
if (aprset[i].desc_type == APR_POLL_SOCKET) {
if (aprset[i].reqevents & APR_POLLIN) {
if (pollset[pos_read++] > 0) {
aprset[i].rtnevents |= APR_POLLIN;
}
}
if (aprset[i].reqevents & APR_POLLOUT) {
if (pollset[pos_write++] > 0) {
aprset[i].rtnevents |= APR_POLLOUT;
}
}
if (aprset[i].reqevents & APR_POLLPRI) {
if (pollset[pos_except++] > 0) {
aprset[i].rtnevents |= APR_POLLPRI;
}
}
}
}
return APR_SUCCESS;
}
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