288 lines
6.3 KiB
C
288 lines
6.3 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* kqueue.c: FreeBSD kqueue compatible network routines.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
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* Copyright (C) 2002-2005 ircd-ratbox development team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: kqueue.c 3241 2007-03-05 17:52:28Z jilles $
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*/
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#include "stdinc.h"
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#include <sys/event.h>
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#include "libcharybdis.h"
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#define KE_LENGTH MAX_CLIENTS
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/* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
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#ifndef EV_SET
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#define EV_SET(kevp, a, b, c, d, e, f) do { \
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(kevp)->ident = (a); \
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(kevp)->filter = (b); \
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(kevp)->flags = (c); \
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(kevp)->fflags = (d); \
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(kevp)->data = (e); \
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(kevp)->udata = (f); \
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} while(0)
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#endif
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static void kq_update_events(fde_t *, short, PF *);
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static int kq;
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static struct timespec zero_timespec;
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static struct kevent *kqlst; /* kevent buffer */
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static int kqmax; /* max structs to buffer */
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static int kqoff; /* offset into the buffer */
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/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
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/* Private functions */
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void
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kq_update_events(fde_t * F, short filter, PF * handler)
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{
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PF *cur_handler;
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int kep_flags;
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switch (filter)
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{
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case EVFILT_READ:
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cur_handler = F->read_handler;
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break;
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case EVFILT_WRITE:
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cur_handler = F->write_handler;
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break;
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default:
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/* XXX bad! -- adrian */
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return;
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break;
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}
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if((cur_handler == NULL && handler != NULL) || (cur_handler != NULL && handler == NULL))
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{
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struct kevent *kep;
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kep = kqlst + kqoff;
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if(handler != NULL)
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{
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if(filter == EVFILT_WRITE)
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kep_flags = (EV_ADD | EV_ENABLE | EV_ONESHOT);
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else
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kep_flags = (EV_ADD | EV_ENABLE);
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}
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else
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{
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/* lets definately not poll stuff that isn't real --
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* some kqueue implementations hate doing this... and
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* it's intended to delete AND disable at the same time.
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*
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* don't believe me? read kevent(4). --nenolod
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*/
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kep_flags = (EV_DELETE | EV_DISABLE);
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}
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EV_SET(kep, (uintptr_t) F->fd, filter, kep_flags, 0, 0, (void *) F);
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if(++kqoff == kqmax)
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{
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int ret;
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ret = kevent(kq, kqlst, kqoff, NULL, 0, &zero_timespec);
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/* jdc -- someone needs to do error checking... */
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if(ret == -1)
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{
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libcharybdis_log("kq_update_events(): kevent(): %s", strerror(errno));
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return;
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}
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kqoff = 0;
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}
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}
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}
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/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
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/* Public functions */
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/*
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* init_netio
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*
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* This is a needed exported function which will be called to initialise
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* the network loop code.
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*/
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void
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init_netio(void)
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{
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kq = kqueue();
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if(kq < 0)
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{
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libcharybdis_log("init_netio: Couldn't open kqueue fd!\n");
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exit(115); /* Whee! */
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}
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kqmax = getdtablesize();
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kqlst = MyMalloc(sizeof(struct kevent) * kqmax);
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zero_timespec.tv_sec = 0;
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zero_timespec.tv_nsec = 0;
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}
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/*
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* comm_setselect
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*
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* This is a needed exported function which will be called to register
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* and deregister interest in a pending IO state for a given FD.
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*/
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void
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comm_setselect(int fd, fdlist_t list, unsigned int type, PF * handler,
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void *client_data, time_t timeout)
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{
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fde_t *F = comm_locate_fd(fd);
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s_assert(fd >= 0);
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s_assert(F->flags.open);
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/* Update the list, even though we're not using it .. */
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F->list = list;
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if(type & COMM_SELECT_READ)
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{
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kq_update_events(F, EVFILT_READ, handler);
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F->read_handler = handler;
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F->read_data = client_data;
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}
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if(type & COMM_SELECT_WRITE)
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{
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kq_update_events(F, EVFILT_WRITE, handler);
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F->write_handler = handler;
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F->write_data = client_data;
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}
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if(timeout)
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F->timeout = CurrentTime + (timeout / 1000);
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}
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/*
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* Check all connections for new connections and input data that is to be
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* processed. Also check for connections with data queued and whether we can
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* write it out.
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*/
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/*
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* comm_select
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*
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* Called to do the new-style IO, courtesy of squid (like most of this
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* new IO code). This routine handles the stuff we've hidden in
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* comm_setselect and fd_table[] and calls callbacks for IO ready
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* events.
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*/
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int
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comm_select(unsigned long delay)
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{
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int num, i;
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static struct kevent ke[KE_LENGTH];
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struct timespec poll_time;
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/*
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* remember we are doing NANOseconds here, not micro/milli. God knows
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* why jlemon used a timespec, but hey, he wrote the interface, not I
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* -- Adrian
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*/
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poll_time.tv_sec = delay / 1000;
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poll_time.tv_nsec = (delay % 1000) * 1000000;
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for (;;)
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{
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num = kevent(kq, kqlst, kqoff, ke, KE_LENGTH, &poll_time);
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kqoff = 0;
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if(num >= 0)
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break;
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if(ignoreErrno(errno))
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break;
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set_time();
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return COMM_ERROR;
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/* NOTREACHED */
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}
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set_time();
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if(num == 0)
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return COMM_OK; /* No error.. */
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for (i = 0; i < num; i++)
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{
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int fd = (int) ke[i].ident;
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PF *hdl = NULL;
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fde_t *F = comm_locate_fd(fd);
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if(ke[i].flags & EV_ERROR)
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{
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errno = (int) ke[i].data;
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/* XXX error == bad! -- adrian */
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continue; /* XXX! */
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}
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if (F == NULL)
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{
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/* XXX this is because of our "queueing" of
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* kqueue changes so we may get ones for fds
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* we have already closed? -- jilles */
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continue;
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}
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switch (ke[i].filter)
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{
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case EVFILT_READ:
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if((hdl = F->read_handler) != NULL)
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{
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F->read_handler = NULL;
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hdl(fd, F->read_data);
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}
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break;
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case EVFILT_WRITE:
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if((hdl = F->write_handler) != NULL)
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{
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F->write_handler = NULL;
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hdl(fd, F->write_data);
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}
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break;
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default:
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/* Bad! -- adrian */
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break;
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}
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}
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return COMM_OK;
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}
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