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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 2001-2014 ircd-hybrid development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*! \file s_bsd_devpoll.c
* \brief /dev/poll compatible network routines.
* \version $Id$
*/
#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_DEVPOLL
#include <sys/ioctl.h>
/* HPUX uses devpoll.h and not sys/devpoll.h */
#ifdef HAVE_DEVPOLL_H
# include <devpoll.h>
#else
# ifdef HAVE_SYS_DEVPOLL_H
# include <sys/devpoll.h>
# else
# error "No devpoll.h found! Try ./configuring and letting the script choose for you."
# endif
#endif
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"
static fde_t dpfd;
/*
* init_netio
*
* This is a needed exported function which will be called to initialise
* the network loop code.
*/
void
init_netio(void)
{
int fd;
if ((fd = open("/dev/poll", O_RDWR)) < 0)
{
ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open /dev/poll - %d: %s",
errno, strerror(errno));
exit(115); /* Whee! */
}
fd_open(&dpfd, fd, 0, "/dev/poll file descriptor");
}
/*
* Write an update to the devpoll filter.
* See, we end up having to do a seperate (?) remove before we do an
* add of a new polltype, so we have to have this function seperate from
* the others.
*/
static void
devpoll_write_update(int fd, int events)
{
struct pollfd pfd;
/* Build the pollfd entry */
pfd.revents = 0;
pfd.fd = fd;
pfd.events = events;
/* Write the thing to our poll fd */
if (write(dpfd.fd, &pfd, sizeof(pfd)) != sizeof(pfd))
ilog(LOG_TYPE_IRCD, "devpoll_write_update: dpfd write failed %d: %s",
errno, strerror(errno));
}
/*
* comm_setselect
*
* This is a needed exported function which will be called to register
* and deregister interest in a pending IO state for a given FD.
*/
void
comm_setselect(fde_t *F, unsigned int type, PF *handler,
void *client_data, time_t timeout)
{
int new_events;
if ((type & COMM_SELECT_READ))
{
F->read_handler = handler;
F->read_data = client_data;
}
if ((type & COMM_SELECT_WRITE))
{
F->write_handler = handler;
F->write_data = client_data;
}
new_events = (F->read_handler ? POLLIN : 0) |
(F->write_handler ? POLLOUT : 0);
if (timeout != 0)
{
F->timeout = CurrentTime + (timeout / 1000);
F->timeout_handler = handler;
F->timeout_data = client_data;
}
if (new_events != F->evcache)
{
devpoll_write_update(F->fd, POLLREMOVE);
if ((F->evcache = new_events))
devpoll_write_update(F->fd, new_events);
}
}
/*
* comm_select
*
* Called to do the new-style IO, courtesy of squid (like most of this
* new IO code). This routine handles the stuff we've hidden in
* comm_setselect and fd_table[] and calls callbacks for IO ready
* events.
*/
void
comm_select(void)
{
int num, i;
struct pollfd pollfds[128];
struct dvpoll dopoll;
PF *hdl;
fde_t *F;
dopoll.dp_timeout = SELECT_DELAY;
dopoll.dp_nfds = 128;
dopoll.dp_fds = &pollfds[0];
num = ioctl(dpfd.fd, DP_POLL, &dopoll);
set_time();
if (num < 0)
{
#ifdef HAVE_USLEEP
usleep(50000); /* avoid 99% CPU in comm_select */
#endif
return;
}
for (i = 0; i < num; i++)
{
F = lookup_fd(dopoll.dp_fds[i].fd);
if (F == NULL || !F->flags.open)
continue;
if ((dopoll.dp_fds[i].revents & POLLIN))
{
if ((hdl = F->read_handler) != NULL)
{
F->read_handler = NULL;
hdl(F, F->read_data);
if (!F->flags.open)
continue;
}
}
if ((dopoll.dp_fds[i].revents & POLLOUT))
{
if ((hdl = F->write_handler) != NULL)
{
F->write_handler = NULL;
hdl(F, F->write_data);
if (!F->flags.open)
continue;
}
}
comm_setselect(F, 0, NULL, NULL, 0);
}
}
#endif
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