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/*
* Copyright (c) 2011 William Pitcock <nenolod@dereferenced.org>.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "mowgli.h"
#ifdef HAVE_POLL_H
#include <poll.h>
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif
typedef struct {
struct pollfd pollfds[FD_SETSIZE];
nfds_t nfds;
mowgli_list_t pollable_list;
} mowgli_poll_eventloop_private_t;
static nfds_t update_poll_fds(mowgli_eventloop_t *eventloop)
{
mowgli_node_t *n, *tn;
mowgli_poll_eventloop_private_t *priv;
nfds_t slot = 0;
return_val_if_fail(eventloop != NULL, 0);
priv = eventloop->poller;
memset(priv->pollfds, '\0', sizeof(priv->pollfds));
MOWGLI_ITER_FOREACH_SAFE(n, tn, priv->pollable_list.head)
{
mowgli_eventloop_pollable_t *pollable = n->data;
#ifdef DEBUG
mowgli_log("considering fd %d pollable %p count %d", pollable->fd, pollable, priv->pollable_list.count);
#endif
if (pollable->read_function || pollable->write_function)
{
priv->pollfds[slot].fd = pollable->fd;
if (pollable->read_function)
priv->pollfds[slot].events |= POLLRDNORM;
if (pollable->write_function)
priv->pollfds[slot].events |= POLLWRNORM;
priv->pollfds[slot].revents = 0;
pollable->slot = slot;
slot++;
}
else
pollable->slot = -1;
}
return slot;
}
static void mowgli_poll_eventloop_pollsetup(mowgli_eventloop_t *eventloop)
{
mowgli_poll_eventloop_private_t *priv;
priv = mowgli_alloc(sizeof(mowgli_poll_eventloop_private_t));
eventloop->poller = priv;
return;
}
static void mowgli_poll_eventloop_pollshutdown(mowgli_eventloop_t *eventloop)
{
mowgli_node_t *n, *tn;
mowgli_poll_eventloop_private_t *priv;
return_if_fail(eventloop != NULL);
priv = eventloop->poller;
MOWGLI_ITER_FOREACH_SAFE(n, tn, priv->pollable_list.head)
{
mowgli_node_delete(n, &priv->pollable_list);
}
mowgli_free(priv);
return;
}
static void mowgli_poll_eventloop_destroy(mowgli_eventloop_t *eventloop, mowgli_eventloop_pollable_t *pollable)
{
mowgli_poll_eventloop_private_t *priv;
return_if_fail(eventloop != NULL);
return_if_fail(pollable != NULL);
priv = eventloop->poller;
mowgli_node_delete(&pollable->node, &priv->pollable_list);
}
static void mowgli_poll_eventloop_setselect(mowgli_eventloop_t *eventloop, mowgli_eventloop_pollable_t *pollable, mowgli_eventloop_io_dir_t dir, mowgli_eventloop_io_cb_t *event_function)
{
mowgli_poll_eventloop_private_t *priv;
return_if_fail(eventloop != NULL);
return_if_fail(pollable != NULL);
priv = eventloop->poller;
#ifdef DEBUG
mowgli_log("setselect %p fd %d func %p", pollable, pollable->fd, event_function);
#endif
if (pollable->read_function || pollable->write_function)
mowgli_node_delete(&pollable->node, &priv->pollable_list);
switch (dir)
{
case MOWGLI_EVENTLOOP_IO_READ:
pollable->read_function = event_function;
break;
case MOWGLI_EVENTLOOP_IO_WRITE:
pollable->write_function = event_function;
break;
default:
mowgli_log("unhandled pollable direction %d", dir);
break;
}
#ifdef DEBUG
mowgli_log("%p -> read %p : write %p", pollable, pollable->read_function, pollable->write_function);
#endif
if (pollable->read_function || pollable->write_function)
mowgli_node_add(pollable, &pollable->node, &priv->pollable_list);
return;
}
static void mowgli_poll_eventloop_select(mowgli_eventloop_t *eventloop, int time)
{
mowgli_node_t *n, *tn;
nfds_t nfds;
mowgli_eventloop_pollable_t *pollable;
mowgli_poll_eventloop_private_t *priv;
int slot;
return_if_fail(eventloop != NULL);
priv = eventloop->poller;
nfds = update_poll_fds(eventloop);
if (poll(priv->pollfds, nfds, time) > 0)
{
mowgli_eventloop_synchronize(eventloop);
/* iterate twice so we don't touch freed memory if a pollable is destroyed */
MOWGLI_ITER_FOREACH_SAFE(n, tn, priv->pollable_list.head)
{
pollable = n->data;
slot = pollable->slot;
if (slot == -1 || priv->pollfds[slot].revents == 0)
continue;
if (priv->pollfds[slot].revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR) && pollable->read_function)
{
#ifdef DEBUG
mowgli_log("run %p(%p, %p, MOWGLI_EVENTLOOP_IO_READ, %p)\n", pollable->read_function, eventloop, pollable, pollable->userdata);
#endif
priv->pollfds[slot].events &= ~(POLLRDNORM | POLLIN);
pollable->read_function(eventloop, pollable, MOWGLI_EVENTLOOP_IO_READ, pollable->userdata);
}
}
MOWGLI_ITER_FOREACH_SAFE(n, tn, priv->pollable_list.head)
{
pollable = n->data;
slot = pollable->slot;
if (slot == -1 || priv->pollfds[slot].revents == 0)
continue;
if (priv->pollfds[slot].revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR) && pollable->write_function)
{
#ifdef DEBUG
mowgli_log("run %p(%p, %p, MOWGLI_EVENTLOOP_IO_WRITE, %p)\n", pollable->write_function, eventloop, pollable, pollable->userdata);
#endif
priv->pollfds[slot].events &= ~(POLLWRNORM | POLLOUT);
pollable->write_function(eventloop, pollable, MOWGLI_EVENTLOOP_IO_WRITE, pollable->userdata);
}
}
}
}
mowgli_eventloop_ops_t _mowgli_poll_pollops = {
.timeout_once = mowgli_simple_eventloop_timeout_once,
.run_once = mowgli_simple_eventloop_run_once,
.pollsetup = mowgli_poll_eventloop_pollsetup,
.pollshutdown = mowgli_poll_eventloop_pollshutdown,
.setselect = mowgli_poll_eventloop_setselect,
.select = mowgli_poll_eventloop_select,
.destroy = mowgli_poll_eventloop_destroy,
};
#endif
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