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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 2000-2014 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_select.c
* \brief select() compatible network routines.
* \version $Id$
*/
#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_SELECT
#include "list.h"
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"
/*
* Note that this is only a single list - multiple lists is kinda pointless
* under select because the list size is a function of the highest FD :-)
* -- adrian
*/
static fd_set select_readfds, tmpreadfds;
static fd_set select_writefds, tmpwritefds;
static int highest_fd = -1;
/*
* init_netio
*
* This is a needed exported function which will be called to initialise
* the network loop code.
*/
void
init_netio(void)
{
FD_ZERO(&select_readfds);
FD_ZERO(&select_writefds);
}
/*
* 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 ? COMM_SELECT_READ : 0) |
(F->write_handler ? COMM_SELECT_WRITE : 0);
if (timeout != 0)
{
F->timeout = CurrentTime + (timeout / 1000);
F->timeout_handler = handler;
F->timeout_data = client_data;
}
if (new_events != F->evcache)
{
if ((new_events & COMM_SELECT_READ))
FD_SET(F->fd, &select_readfds);
else
{
FD_CLR(F->fd, &select_readfds);
FD_CLR(F->fd, &tmpreadfds);
}
if ((new_events & COMM_SELECT_WRITE))
FD_SET(F->fd, &select_writefds);
else
{
FD_CLR(F->fd, &select_writefds);
FD_CLR(F->fd, &tmpwritefds);
}
if (new_events == 0)
{
if (highest_fd == F->fd)
while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) ||
FD_ISSET(highest_fd, &select_writefds)))
highest_fd--;
}
else if (F->evcache == 0)
if (F->fd > highest_fd)
highest_fd = F->fd;
F->evcache = 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)
{
struct timeval to;
int num, fd;
fde_t *F;
PF *hdl;
/* Copy over the read/write sets so we don't have to rebuild em */
memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));
to.tv_sec = 0;
to.tv_usec = SELECT_DELAY * 1000;
num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
set_time();
if (num < 0)
{
#ifdef HAVE_USLEEP
usleep(50000);
#endif
return;
}
for (fd = 0; fd <= highest_fd && num > 0; fd++)
{
if (FD_ISSET(fd, &tmpreadfds) || FD_ISSET(fd, &tmpwritefds))
{
num--;
F = lookup_fd(fd);
if (F == NULL || !F->flags.open)
continue;
if (FD_ISSET(fd, &tmpreadfds))
{
if ((hdl = F->read_handler) != NULL)
{
F->read_handler = NULL;
hdl(F, F->read_data);
if (!F->flags.open)
continue;
}
}
if (FD_ISSET(fd, &tmpwritefds))
{
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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