405 lines
7.9 KiB
C
405 lines
7.9 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*
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* $Id: kqueue.c 25038 2008-01-23 16:03:08Z androsyn $
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*/
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#include <libratbox_config.h>
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#include <ratbox_lib.h>
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#include <commio-int.h>
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#include <event-int.h>
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#if defined(HAVE_SYS_EVENT_H) && (HAVE_KEVENT)
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#include <sys/event.h>
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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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#ifdef EVFILT_TIMER
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#define KQUEUE_SCHED_EVENT
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#endif
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static void kq_update_events(rb_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 struct kevent *kqout; /* kevent output 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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int
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rb_setup_fd_kqueue(rb_fde_t * F)
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{
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return 0;
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}
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static void
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kq_update_events(rb_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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kep_flags = EV_ADD | EV_ONESHOT;
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}
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else
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{
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kep_flags = EV_DELETE;
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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, i;
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/* Add them one at a time, because there may be
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* already closed fds in it. The kernel will try
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* to report invalid fds in the output; if there
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* is no space, it silently stops processing the
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* array at that point. We cannot give output space
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* because that would also return events we cannot
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* process at this point.
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*/
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for (i = 0; i < kqoff; i++)
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{
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ret = kevent(kq, kqlst + i, 1, NULL, 0, &zero_timespec);
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/* jdc -- someone needs to do error checking... */
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/* EBADF is normal here -- jilles */
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if(ret == -1 && errno != EBADF)
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rb_lib_log("kq_update_events(): kevent(): %s", strerror(errno));
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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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* rb_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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int
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rb_init_netio_kqueue(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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return errno;
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}
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kqmax = getdtablesize();
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kqlst = rb_malloc(sizeof(struct kevent) * kqmax);
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kqout = rb_malloc(sizeof(struct kevent) * kqmax);
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rb_open(kq, RB_FD_UNKNOWN, "kqueue fd");
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zero_timespec.tv_sec = 0;
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zero_timespec.tv_nsec = 0;
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return 0;
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}
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/*
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* rb_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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rb_setselect_kqueue(rb_fde_t * F, unsigned int type, PF * handler, void *client_data)
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{
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lrb_assert(IsFDOpen(F));
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if(type & RB_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 & RB_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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}
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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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* rb_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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* rb_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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rb_select_kqueue(long delay)
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{
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int num, i;
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struct timespec poll_time;
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struct timespec *pt;
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rb_fde_t *F;
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if(delay < 0) {
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pt = NULL;
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}
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else {
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pt = &poll_time;
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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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}
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for (;;)
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{
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num = kevent(kq, kqlst, kqoff, kqout, kqmax, pt);
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kqoff = 0;
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if(num >= 0)
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break;
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if(rb_ignore_errno(errno))
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break;
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rb_set_time();
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return RB_ERROR;
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/* NOTREACHED */
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}
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rb_set_time();
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if(num == 0)
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return RB_OK; /* No error.. */
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for (i = 0; i < num; i++)
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{
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PF *hdl = NULL;
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if(kqout[i].flags & EV_ERROR)
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{
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errno = kqout[i].data;
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/* XXX error == bad! -- adrian */
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continue; /* XXX! */
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}
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switch (kqout[i].filter)
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{
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case EVFILT_READ:
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F = kqout[i].udata;
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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(F, F->read_data);
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}
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break;
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case EVFILT_WRITE:
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F = kqout[i].udata;
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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(F, F->write_data);
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}
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break;
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#if defined(EVFILT_TIMER)
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case EVFILT_TIMER:
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rb_run_event(kqout[i].udata);
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break;
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#endif
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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 RB_OK;
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}
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static int can_do_event = 0;
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int
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rb_kqueue_supports_event(void)
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{
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struct kevent kv;
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struct timespec ts;
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int xkq;
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if(can_do_event == 1)
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return 1;
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if(can_do_event == -1)
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return 0;
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xkq = kqueue();
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ts.tv_sec = 0;
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ts.tv_nsec = 1000;
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EV_SET(&kv, (uintptr_t) 0x0, EVFILT_TIMER, EV_ADD | EV_ONESHOT, 0, 1, 0);
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if(kevent(xkq, &kv, 1, NULL, 0, NULL) < 0)
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{
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can_do_event = -1;
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close(xkq);
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return 0;
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}
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close(xkq);
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can_do_event = 1;
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return 1;
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}
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int
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rb_kqueue_sched_event(struct ev_entry *event, int when)
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{
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struct kevent kev;
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int kep_flags;
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kep_flags = EV_ADD;
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if(event->frequency == 0)
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kep_flags |= EV_ONESHOT;
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EV_SET(&kev, (uintptr_t) event, EVFILT_TIMER, kep_flags, 0, when * 1000, event);
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if(kevent(kq, &kev, 1, NULL, 0, NULL) < 0)
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return 0;
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return 1;
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}
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void
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rb_kqueue_unsched_event(struct ev_entry *event)
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{
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struct kevent kev;
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EV_SET(&kev, (uintptr_t) event, EVFILT_TIMER, EV_DELETE, 0, 0, event);
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kevent(kq, &kev, 1, NULL, 0, NULL);
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}
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void
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rb_kqueue_init_event(void)
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{
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return;
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}
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#else /* kqueue not supported */
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int
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rb_init_netio_kqueue(void)
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{
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errno = ENOSYS;
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return -1;
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}
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void
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rb_setselect_kqueue(rb_fde_t * F, unsigned int type, PF * handler, void *client_data)
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{
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errno = ENOSYS;
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return;
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}
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int
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rb_select_kqueue(long delay)
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{
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errno = ENOSYS;
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return -1;
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}
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int
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rb_setup_fd_kqueue(rb_fde_t * F)
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{
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errno = ENOSYS;
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return -1;
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}
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#endif
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#if !defined(HAVE_KEVENT) || !defined(KQUEUE_SCHED_EVENT)
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void
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rb_kqueue_init_event(void)
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{
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return;
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}
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int
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rb_kqueue_sched_event(struct ev_entry *event, int when)
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{
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errno = ENOSYS;
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return -1;
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}
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void
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rb_kqueue_unsched_event(struct ev_entry *event)
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{
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return;
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}
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int
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rb_kqueue_supports_event(void)
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{
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errno = ENOSYS;
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return 0;
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}
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#endif /* !HAVE_KEVENT || !KQUEUE_SCHED_EVENT */
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