/*
* ircd-ratbox: A slightly useful ircd.
* kqueue.c: FreeBSD kqueue 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: kqueue.c 398 2005-12-12 18:12:46Z nenolod $
*/
#include "stdinc.h"
#include <sys/event.h>
#include "libcharybdis.h"
#define KE_LENGTH MAX_CLIENTS
/* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
#ifndef EV_SET
#define EV_SET(kevp, a, b, c, d, e, f) do { \
(kevp)->ident = (a); \
(kevp)->filter = (b); \
(kevp)->flags = (c); \
(kevp)->fflags = (d); \
(kevp)->data = (e); \
(kevp)->udata = (f); \
} while(0)
#endif
static void kq_update_events(fde_t *, short, PF *);
static int kq;
static struct timespec zero_timespec;
static struct kevent *kqlst; /* kevent buffer */
static int kqmax; /* max structs to buffer */
static int kqoff; /* offset into the buffer */
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
/* Private functions */
void
kq_update_events(fde_t * F, short filter, PF * handler)
{
PF *cur_handler;
int kep_flags;
switch (filter)
{
case EVFILT_READ:
cur_handler = F->read_handler;
break;
case EVFILT_WRITE:
cur_handler = F->write_handler;
break;
default:
/* XXX bad! -- adrian */
return;
break;
}
if((cur_handler == NULL && handler != NULL) || (cur_handler != NULL && handler == NULL))
{
struct kevent *kep;
kep = kqlst + kqoff;
if(handler != NULL)
{
if(filter == EVFILT_WRITE)
kep_flags = (EV_ADD | EV_ENABLE | EV_ONESHOT);
else
kep_flags = (EV_ADD | EV_ENABLE);
}
else
{
/* lets definately not poll stuff that isn't real --
* some kqueue implementations hate doing this... and
* it's intended to delete AND disable at the same time.
*
* don't believe me? read kevent(4). --nenolod
*/
kep_flags = (EV_DELETE | EV_DISABLE);
}
EV_SET(kep, (uintptr_t) F->fd, filter, kep_flags, 0, 0, (void *) F);
if(kqoff == kqmax)
{
int ret;
ret = kevent(kq, kqlst, kqoff, NULL, 0, &zero_timespec);
/* jdc -- someone needs to do error checking... */
if(ret == -1)
{
libcharybdis_log("kq_update_events(): kevent(): %s", strerror(errno));
return;
}
kqoff = 0;
}
else
{
kqoff++;
}
}
}
/* 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)
{
kq = kqueue();
if(kq < 0)
{
libcharybdis_log("init_netio: Couldn't open kqueue fd!\n");
exit(115); /* Whee! */
}
kqmax = getdtablesize();
kqlst = MyMalloc(sizeof(struct kevent) * kqmax);
zero_timespec.tv_sec = 0;
zero_timespec.tv_nsec = 0;
}
/*
* 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 = &fd_table[fd];
s_assert(fd >= 0);
s_assert(F->flags.open);
/* Update the list, even though we're not using it .. */
F->list = list;
if(type & COMM_SELECT_READ)
{
kq_update_events(F, EVFILT_READ, handler);
F->read_handler = handler;
F->read_data = client_data;
}
if(type & COMM_SELECT_WRITE)
{
kq_update_events(F, EVFILT_WRITE, handler);
F->write_handler = handler;
F->write_data = client_data;
}
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
*
* 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.
*/
int
comm_select(unsigned long delay)
{
int num, i;
static struct kevent ke[KE_LENGTH];
struct timespec poll_time;
/*
* remember we are doing NANOseconds here, not micro/milli. God knows
* why jlemon used a timespec, but hey, he wrote the interface, not I
* -- Adrian
*/
poll_time.tv_sec = delay / 1000;
poll_time.tv_nsec = (delay % 1000) * 1000000;
for (;;)
{
num = kevent(kq, kqlst, kqoff, ke, KE_LENGTH, &poll_time);
kqoff = 0;
if(num >= 0)
break;
if(ignoreErrno(errno))
break;
set_time();
return COMM_ERROR;
/* NOTREACHED */
}
set_time();
if(num == 0)
return COMM_OK; /* No error.. */
for (i = 0; i < num; i++)
{
int fd = (int) ke[i].ident;
PF *hdl = NULL;
fde_t *F = &fd_table[fd];
if(ke[i].flags & EV_ERROR)
{
errno = (int) ke[i].data;
/* XXX error == bad! -- adrian */
continue; /* XXX! */
}
switch (ke[i].filter)
{
case EVFILT_READ:
if((hdl = F->read_handler) != NULL)
{
F->read_handler = NULL;
hdl(fd, F->read_data);
}
break;
case EVFILT_WRITE:
if((hdl = F->write_handler) != NULL)
{
F->write_handler = NULL;
hdl(fd, F->write_data);
}
break;
default:
/* Bad! -- adrian */
break;
}
}
return COMM_OK;
}