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/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed 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"
struct apr_pollset_t {
apr_pool_t *pool;
apr_uint32_t nelts;
apr_uint32_t nalloc;
int *pollset;
int num_read;
int num_write;
int num_except;
int num_total;
apr_pollfd_t *query_set;
apr_pollfd_t *result_set;
};
APR_DECLARE(apr_status_t) apr_pollset_create(apr_pollset_t **pollset,
apr_uint32_t size,
apr_pool_t *p,
apr_uint32_t flags)
{
*pollset = apr_palloc(p, sizeof(**pollset));
(*pollset)->pool = p;
(*pollset)->nelts = 0;
(*pollset)->nalloc = size;
(*pollset)->pollset = apr_palloc(p, size * sizeof(int) * 3);
(*pollset)->query_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
(*pollset)->result_set = apr_palloc(p, size * sizeof(apr_pollfd_t));
(*pollset)->num_read = -1;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t *pollset)
{
/* A no-op function for now. If we later implement /dev/poll
* support, we'll need to close the /dev/poll fd here
*/
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset,
const apr_pollfd_t *descriptor)
{
if (pollset->nelts == pollset->nalloc) {
return APR_ENOMEM;
}
pollset->query_set[pollset->nelts] = *descriptor;
if (descriptor->desc_type != APR_POLL_SOCKET) {
return APR_EBADF;
}
pollset->nelts++;
pollset->num_read = -1;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_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->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->query_set[i].desc.s) {
pollset->nelts--;
}
else {
pollset->pollset[dst] = pollset->pollset[i];
pollset->query_set[dst] = pollset->query_set[i];
dst++;
}
}
pollset->num_read = -1;
return APR_SUCCESS;
}
}
return APR_NOTFOUND;
}
static void make_pollset(apr_pollset_t *pollset)
{
int i;
int pos = 0;
pollset->num_read = 0;
pollset->num_write = 0;
pollset->num_except = 0;
for (i = 0; i < pollset->nelts; i++) {
if (pollset->query_set[i].reqevents & APR_POLLIN) {
pollset->pollset[pos++] = pollset->query_set[i].desc.s->socketdes;
pollset->num_read++;
}
}
for (i = 0; i < pollset->nelts; i++) {
if (pollset->query_set[i].reqevents & APR_POLLOUT) {
pollset->pollset[pos++] = pollset->query_set[i].desc.s->socketdes;
pollset->num_write++;
}
}
for (i = 0; i < pollset->nelts; i++) {
if (pollset->query_set[i].reqevents & APR_POLLPRI) {
pollset->pollset[pos++] = pollset->query_set[i].desc.s->socketdes;
pollset->num_except++;
}
}
pollset->num_total = pollset->num_read + pollset->num_write + pollset->num_except;
}
APR_DECLARE(apr_status_t) apr_pollset_poll(apr_pollset_t *pollset,
apr_interval_time_t timeout,
apr_int32_t *num,
const apr_pollfd_t **descriptors)
{
int rv;
apr_uint32_t i;
int *pollresult;
int read_pos, write_pos, except_pos;
if (pollset->num_read < 0) {
make_pollset(pollset);
}
pollresult = alloca(sizeof(int) * pollset->num_total);
memcpy(pollresult, pollset->pollset, sizeof(int) * pollset->num_total);
(*num) = 0;
if (timeout > 0) {
timeout /= 1000;
}
rv = select(pollresult, pollset->num_read, pollset->num_write, pollset->num_except, timeout);
if (rv < 0) {
return APR_FROM_OS_ERROR(sock_errno());
}
if (rv == 0) {
return APR_TIMEUP;
}
read_pos = 0;
write_pos = pollset->num_read;
except_pos = pollset->num_read + pollset->num_write;
for (i = 0; i < pollset->nelts; i++) {
int rtnevents = 0;
if (pollset->query_set[i].reqevents & APR_POLLIN) {
if (pollresult[read_pos++] != -1) {
rtnevents |= APR_POLLIN;
}
}
if (pollset->query_set[i].reqevents & APR_POLLOUT) {
if (pollresult[write_pos++] != -1) {
rtnevents |= APR_POLLOUT;
}
}
if (pollset->query_set[i].reqevents & APR_POLLPRI) {
if (pollresult[except_pos++] != -1) {
rtnevents |= APR_POLLPRI;
}
}
if (rtnevents) {
pollset->result_set[*num] = pollset->query_set[i];
pollset->result_set[*num].rtnevents = rtnevents;
(*num)++;
}
}
*descriptors = pollset->result_set;
return APR_SUCCESS;
}
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