mirror of
https://github.com/matrix-construct/construct
synced 2024-09-08 17:55:47 +02:00
202 lines
4.6 KiB
C
202 lines
4.6 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* select.c: select() compatible network routines.
|
|
*
|
|
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
|
|
* Copyright (C) 1996-2002 Hybrid Development Team
|
|
* Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
|
|
* Copyright (C) 2002-2005 ircd-ratbox 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
|
|
*
|
|
* $Id: select.c 3528 2007-07-07 08:08:23Z nenolod $
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include "libcharybdis.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
|
|
*/
|
|
|
|
fd_set select_readfds;
|
|
fd_set select_writefds;
|
|
|
|
/*
|
|
* You know, I'd rather have these local to comm_select but for some
|
|
* reason my gcc decides that I can't modify them at all..
|
|
* -- adrian
|
|
*/
|
|
fd_set tmpreadfds;
|
|
fd_set tmpwritefds;
|
|
|
|
static void select_update_selectfds(int fd, short event, PF * handler);
|
|
|
|
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
|
|
/* Private functions */
|
|
|
|
/*
|
|
* set and clear entries in the select array ..
|
|
*/
|
|
static void
|
|
select_update_selectfds(int fd, short event, PF * handler)
|
|
{
|
|
/* Update the read / write set */
|
|
if(event & COMM_SELECT_READ)
|
|
{
|
|
if(handler)
|
|
FD_SET(fd, &select_readfds);
|
|
else
|
|
FD_CLR(fd, &select_readfds);
|
|
}
|
|
if(event & COMM_SELECT_WRITE)
|
|
{
|
|
if(handler)
|
|
FD_SET(fd, &select_writefds);
|
|
else
|
|
FD_CLR(fd, &select_writefds);
|
|
}
|
|
}
|
|
|
|
|
|
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
|
|
/* Public functions */
|
|
|
|
|
|
/*
|
|
* 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(int fd, fdlist_t list, unsigned int type, PF * handler,
|
|
void *client_data, time_t timeout)
|
|
{
|
|
fde_t *F = comm_locate_fd(fd);
|
|
s_assert(fd >= 0);
|
|
|
|
if (!F)
|
|
F = comm_add_fd(fd);
|
|
|
|
if(type & COMM_SELECT_READ)
|
|
{
|
|
F->read_handler = handler;
|
|
F->read_data = client_data;
|
|
select_update_selectfds(fd, COMM_SELECT_READ, handler);
|
|
}
|
|
if(type & COMM_SELECT_WRITE)
|
|
{
|
|
F->write_handler = handler;
|
|
F->write_data = client_data;
|
|
select_update_selectfds(fd, COMM_SELECT_WRITE, handler);
|
|
}
|
|
if(timeout)
|
|
F->timeout = CurrentTime + (timeout / 1000);
|
|
}
|
|
|
|
/*
|
|
* Check all connections for new connections and input data that is to be
|
|
* processed. Also check for connections with data queued and whether we can
|
|
* write it out.
|
|
*/
|
|
|
|
/*
|
|
* comm_select
|
|
*
|
|
* Do IO events
|
|
*/
|
|
|
|
int
|
|
comm_select(unsigned long delay)
|
|
{
|
|
int num;
|
|
int fd;
|
|
PF *hdl;
|
|
fde_t *F;
|
|
struct timeval to;
|
|
|
|
/* 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));
|
|
|
|
for (;;)
|
|
{
|
|
to.tv_sec = 0;
|
|
to.tv_usec = delay * 1000;
|
|
num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
|
|
if(num >= 0)
|
|
break;
|
|
if(ignoreErrno(errno))
|
|
continue;
|
|
set_time();
|
|
/* error! */
|
|
return -1;
|
|
/* NOTREACHED */
|
|
}
|
|
set_time();
|
|
|
|
if(num == 0)
|
|
return 0;
|
|
|
|
/* XXX we *could* optimise by falling out after doing num fds ... */
|
|
for (fd = 0; fd < highest_fd + 1; fd++)
|
|
{
|
|
F = comm_locate_fd(fd);
|
|
|
|
if(FD_ISSET(fd, &tmpreadfds))
|
|
{
|
|
hdl = F->read_handler;
|
|
F->read_handler = NULL;
|
|
if(hdl)
|
|
hdl(fd, F->read_data);
|
|
}
|
|
|
|
if(F->flags.open == 0)
|
|
continue; /* Read handler closed us..go on */
|
|
|
|
if(FD_ISSET(fd, &tmpwritefds))
|
|
{
|
|
hdl = F->write_handler;
|
|
F->write_handler = NULL;
|
|
if(hdl)
|
|
hdl(fd, F->write_data);
|
|
}
|
|
|
|
if(F->read_handler == NULL)
|
|
select_update_selectfds(fd, COMM_SELECT_READ, NULL);
|
|
if(F->write_handler == NULL)
|
|
select_update_selectfds(fd, COMM_SELECT_WRITE, NULL);
|
|
}
|
|
return 0;
|
|
}
|
|
|