300 lines
6.7 KiB
C
300 lines
6.7 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* s_bsd_devpoll.c: /dev/poll 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: devpoll.c 26254 2008-12-10 04:04:38Z 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 <fcntl.h>
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#if defined(HAVE_DEVPOLL) && (HAVE_SYS_DEVPOLL_H)
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#include <sys/devpoll.h>
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static int dpfd;
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static int maxfd;
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static short *fdmask;
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static void devpoll_update_events(rb_fde_t *, short, PF *);
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static void devpoll_write_update(int, int);
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int
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rb_setup_fd_devpoll(rb_fde_t *F)
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{
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return 0;
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}
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/*
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* Write an update to the devpoll filter.
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* See, we end up having to do a seperate (?) remove before we do an
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* add of a new polltype, so we have to have this function seperate from
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* the others.
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*/
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static void
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devpoll_write_update(int fd, int events)
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{
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struct pollfd pollfds[1]; /* Just to be careful */
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int retval;
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/* Build the pollfd entry */
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pollfds[0].revents = 0;
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pollfds[0].fd = fd;
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pollfds[0].events = events;
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/* Write the thing to our poll fd */
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retval = write(dpfd, &pollfds[0], sizeof(struct pollfd));
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if(retval != sizeof(struct pollfd))
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rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno,
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strerror(errno));
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/* Done! */
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}
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static void
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devpoll_update_events(rb_fde_t *F, short filter, PF * handler)
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{
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int update_required = 0;
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int fd = rb_get_fd(F);
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int cur_mask = fdmask[fd];
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PF *cur_handler;
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fdmask[fd] = 0;
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switch (filter)
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{
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case RB_SELECT_READ:
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cur_handler = F->read_handler;
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if(handler)
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fdmask[fd] |= POLLRDNORM;
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else
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fdmask[fd] &= ~POLLRDNORM;
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if(F->write_handler)
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fdmask[fd] |= POLLWRNORM;
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break;
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case RB_SELECT_WRITE:
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cur_handler = F->write_handler;
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if(handler)
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fdmask[fd] |= POLLWRNORM;
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else
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fdmask[fd] &= ~POLLWRNORM;
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if(F->read_handler)
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fdmask[fd] |= POLLRDNORM;
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break;
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default:
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return;
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break;
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}
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if(cur_handler == NULL && handler != NULL)
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update_required++;
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else if(cur_handler != NULL && handler == NULL)
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update_required++;
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if(cur_mask != fdmask[fd])
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update_required++;
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if(update_required)
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{
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/*
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* Ok, we can call devpoll_write_update() here now to re-build the
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* fd struct. If we end up with nothing on this fd, it won't write
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* anything.
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*/
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if(fdmask[fd])
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{
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devpoll_write_update(fd, POLLREMOVE);
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devpoll_write_update(fd, fdmask[fd]);
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}
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else
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devpoll_write_update(fd, POLLREMOVE);
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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_devpoll(void)
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{
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dpfd = open("/dev/poll", O_RDWR);
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if(dpfd < 0)
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{
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return errno;
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}
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maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */
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fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1);
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rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor");
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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_devpoll(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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devpoll_update_events(F, RB_SELECT_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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devpoll_update_events(F, RB_SELECT_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_devpoll(long delay)
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{
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int num, i;
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struct pollfd pollfds[maxfd];
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struct dvpoll dopoll;
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do
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{
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for(;;)
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{
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dopoll.dp_timeout = delay;
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dopoll.dp_nfds = maxfd;
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dopoll.dp_fds = &pollfds[0];
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num = ioctl(dpfd, DP_POLL, &dopoll);
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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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}
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rb_set_time();
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if(num == 0)
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continue;
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for(i = 0; i < num; i++)
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{
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int fd = dopoll.dp_fds[i].fd;
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PF *hdl = NULL;
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rb_fde_t *F = rb_find_fd(fd);
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if((dopoll.dp_fds[i].revents & (POLLRDNORM | POLLIN | POLLHUP |
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POLLERR))
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&& (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN)))
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{
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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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* this call used to be with a NULL pointer, BUT
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* in the devpoll case we only want to update the
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* poll set *if* the handler changes state (active ->
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* NULL or vice versa.)
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*/
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devpoll_update_events(F, RB_SELECT_READ, F->read_handler);
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}
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}
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if(!IsFDOpen(F))
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continue; /* Read handler closed us..go on to do something more useful */
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if((dopoll.dp_fds[i].revents & (POLLWRNORM | POLLOUT | POLLHUP |
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POLLERR))
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&& (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT)))
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{
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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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/* See above similar code in the read case */
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devpoll_update_events(F,
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RB_SELECT_WRITE, F->write_handler);
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}
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}
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}
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return RB_OK;
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}
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while(0);
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/* XXX Get here, we broke! */
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return 0;
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}
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#else /* /dev/poll not supported */
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int
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rb_init_netio_devpoll(void)
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{
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return ENOSYS;
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}
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void
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rb_setselect_devpoll(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_devpoll(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_devpoll(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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