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/*
* atheme-services: A collection of minimalist IRC services
* poll.c: poll(2) socket engine.
*
* Copyright (c) 2005-2007 Atheme Project (http://www.atheme.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 <sys/poll.h>
#include "atheme.h"
#include "internal.h"
#include "datastream.h"
/*
* linux does not provide POLLWRNORM by default, and we're not _XOPEN_SOURCE.
* so.... we have to do this crap below.
*/
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif
struct pollfd pollfds[FD_SETSIZE]; /* XXX We need a define indicating MAXCONN. */
/*
* init_socket_queues()
*
* inputs:
* none
*
* outputs:
* none
*
* side effects:
* when using select, we don't need to do anything here.
*/
void init_socket_queues(void)
{
memset(&pollfds, 0, sizeof(struct pollfd) * FD_SETSIZE);
}
/*
* update_poll_fds()
*
* inputs:
* none
*
* outputs:
* number of sockets to be polled
*
* side effects:
* registered sockets are prepared for the poll() loop.
*/
static nfds_t update_poll_fds(void)
{
mowgli_node_t *n;
connection_t *cptr;
nfds_t slot = 0;
MOWGLI_ITER_FOREACH(n, connection_list.head)
{
cptr = n->data;
if (cptr->read_handler || cptr->write_handler)
{
pollfds[slot].fd = cptr->fd;
if (cptr->read_handler)
pollfds[slot].events |= POLLRDNORM;
if (cptr->write_handler)
pollfds[slot].events |= POLLWRNORM;
pollfds[slot].revents = 0;
cptr->pollslot = slot;
slot++;
}
else
cptr->pollslot = -1;
}
return slot;
}
/*
* connection_select()
*
* inputs:
* delay in milliseconds
*
* outputs:
* none
*
* side effects:
* registered sockets and their associated handlers are acted on.
*/
void connection_select(int delay)
{
int sr;
mowgli_node_t *n, *tn;
connection_t *cptr;
int slot;
nfds_t count;
count = update_poll_fds();
if ((sr = poll(pollfds, count, delay)) > 0)
{
CURRTIME = time(NULL);
/* Iterate twice, so we don't touch freed memory if
* a connection is closed.
* -- jilles */
MOWGLI_ITER_FOREACH_SAFE(n, tn, connection_list.head)
{
cptr = n->data;
slot = cptr->pollslot;
if (slot == -1 || pollfds[slot].revents == 0)
continue;
if (pollfds[slot].revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR) && cptr->read_handler)
{
pollfds[slot].events &= ~(POLLRDNORM | POLLIN | POLLHUP | POLLERR);
cptr->read_handler(cptr);
}
}
MOWGLI_ITER_FOREACH_SAFE(n, tn, connection_list.head)
{
cptr = n->data;
slot = cptr->pollslot;
if (slot == -1 || pollfds[slot].revents == 0)
continue;
if (pollfds[slot].revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR) && cptr->write_handler)
{
pollfds[slot].events &= ~(POLLWRNORM | POLLOUT | POLLHUP | POLLERR);
cptr->write_handler(cptr);
}
}
MOWGLI_ITER_FOREACH_SAFE(n, tn, connection_list.head)
{
cptr = n->data;
if (cptr->flags & CF_DEAD)
connection_close(cptr);
}
}
}
/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
* vim:ts=8
* vim:sw=8
* vim:noexpandtab
*/
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