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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_kqueue.c
* \brief kqueue() compatible network routines.
* \version $Id$
*/
#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_KQUEUE
#include <sys/event.h>
#include "fdlist.h"
#include "ircd.h"
#include "memory.h"
#include "s_bsd.h"
#include "log.h"
#define KE_LENGTH 128
/* 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 fde_t kqfd;
static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
static int kqoff; /* offset into the buffer */
/*
* 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 = kqueue()) < 0)
{
ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open kqueue fd!");
exit(115); /* Whee! */
}
fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
}
/*
* Write a single update to the kqueue list.
*/
static void
kq_update_events(int fd, int filter, int what)
{
static struct timespec zero_timespec = {0, 0};
struct kevent *kep = kq_fdlist + kqoff;
EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
if (++kqoff == KE_LENGTH)
{
int i;
for (i = 0; i < kqoff; ++i)
kevent(kqfd.fd, &kq_fdlist[i], 1, NULL, 0, &zero_timespec);
kqoff = 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(fde_t *F, unsigned int type, PF *handler,
void *client_data, time_t timeout)
{
int new_events, diff;
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;
}
diff = new_events ^ F->evcache;
if ((diff & COMM_SELECT_READ))
kq_update_events(F->fd, EVFILT_READ,
(new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
if ((diff & COMM_SELECT_WRITE))
kq_update_events(F->fd, EVFILT_WRITE,
(new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
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)
{
int num, i;
static struct kevent ke[KE_LENGTH];
struct timespec poll_time;
PF *hdl;
fde_t *F;
/*
* 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 = 0;
poll_time.tv_nsec = SELECT_DELAY * 1000000;
num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
kqoff = 0;
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(ke[i].ident);
if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
continue;
if (ke[i].filter == EVFILT_READ)
{
if ((hdl = F->read_handler) != NULL)
{
F->read_handler = NULL;
hdl(F, F->read_data);
if (!F->flags.open)
continue;
}
}
if (ke[i].filter == EVFILT_WRITE)
{
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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