/* * ircd-ratbox: A slightly useful ircd. * s_bsd_devpoll.c: /dev/poll 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 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 * USA * * $Id: devpoll.c 25038 2008-01-23 16:03:08Z androsyn $ */ #include #include #include #include #if defined(HAVE_DEVPOLL) && (HAVE_DEVPOLL_H) #include static void devpoll_update_events(int, short, PF *); static int dpfd; static int maxfd; static short *fdmask; static void devpoll_update_events(int, short, PF *); static void devpoll_write_update(int, int); int rb_setup_fd_devpoll(rb_fde_t *F) { return 0; } /* * Write an update to the devpoll filter. * See, we end up having to do a seperate (?) remove before we do an * add of a new polltype, so we have to have this function seperate from * the others. */ static void devpoll_write_update(int fd, int events) { struct pollfd pollfds[1]; /* Just to be careful */ int retval; /* Build the pollfd entry */ pollfds[0].revents = 0; pollfds[0].fd = fd; pollfds[0].events = events; /* Write the thing to our poll fd */ retval = write(dpfd, &pollfds[0], sizeof(struct pollfd)); if(retval != sizeof(struct pollfd)) rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno, strerror(errno)); /* Done! */ } static void devpoll_update_events(int fd, short filter, PF * handler) { int update_required = 0; int cur_mask = fdmask[fd]; PF *cur_handler; fdmask[fd] = 0; switch (filter) { case RB_SELECT_READ: cur_handler = F->read_handler; if(handler) fdmask[fd] |= POLLRDNORM; else fdmask[fd] &= ~POLLRDNORM; if(F->write_handler) fdmask[fd] |= POLLWRNORM; break; case RB_SELECT_WRITE: cur_handler = F->write_handler; if(handler) fdmask[fd] |= POLLWRNORM; else fdmask[fd] &= ~POLLWRNORM; if(F->read_handler) fdmask[fd] |= POLLRDNORM; break; default: return; break; } if(cur_handler == NULL && handler != NULL) update_required++; else if(cur_handler != NULL && handler == NULL) update_required++; if(cur_mask != fdmask[fd]) update_required++; if(update_required) { /* * Ok, we can call devpoll_write_update() here now to re-build the * fd struct. If we end up with nothing on this fd, it won't write * anything. */ if(fdmask[fd]) { devpoll_write_update(fd, POLLREMOVE); devpoll_write_update(fd, fdmask[fd]); } else devpoll_write_update(fd, POLLREMOVE); } } /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ /* Public functions */ /* * rb_init_netio * * This is a needed exported function which will be called to initialise * the network loop code. */ int rb_init_netio_devpoll(void) { dpfd = open("/dev/poll", O_RDWR); if(dpfd < 0) { return errno; } maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */ fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1); rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor"); } /* * rb_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 rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) { lrb_assert(IsFDOpen(F)); if(type & RB_SELECT_READ) { devpoll_update_events(fd, RB_SELECT_READ, handler); F->read_handler = handler; F->read_data = client_data; } if(type & RB_SELECT_WRITE) { devpoll_update_events(fd, RB_SELECT_WRITE, handler); F->write_handler = handler; F->write_data = client_data; } } /* * 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. */ /* * rb_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 * rb_setselect and fd_table[] and calls callbacks for IO ready * events. */ int rb_select_devpoll(long delay) { int num, i; struct pollfd pollfds[maxfd]; struct dvpoll dopoll; do { for (;;) { dopoll.dp_timeout = delay; dopoll.dp_nfds = maxfd; dopoll.dp_fds = &pollfds[0]; num = ioctl(dpfd, DP_POLL, &dopoll); if(num >= 0) break; if(rb_ignore_errno(errno)) break; rb_set_time(); return RB_ERROR; } rb_set_time(); if(num == 0) continue; for (i = 0; i < num; i++) { int fd = dopoll.dp_fds[i].fd; PF *hdl = NULL; rb_fde_t *F = rb_find_fd(fd); if((dopoll.dp_fds[i]. revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) { if((hdl = F->read_handler) != NULL) { F->read_handler = NULL; hdl(F, F->read_data); /* * this call used to be with a NULL pointer, BUT * in the devpoll case we only want to update the * poll set *if* the handler changes state (active -> * NULL or vice versa.) */ devpoll_update_events(fd, RB_SELECT_READ, F->read_handler); } } if(!IsFDOpen(F)) continue; /* Read handler closed us..go on to do something more useful */ if((dopoll.dp_fds[i]. revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) { if((hdl = F->write_handler) != NULL) { F->write_handler = NULL; hdl(F, F->write_data); /* See above similar code in the read case */ devpoll_update_events(fd, RB_SELECT_WRITE, F->write_handler); } } } return RB_OK; } while (0); /* XXX Get here, we broke! */ return 0; } #else /* /dev/poll not supported */ int rb_init_netio_devpoll(void) { return ENOSYS; } void rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) { errno = ENOSYS; return; } int rb_select_devpoll(long delay) { errno = ENOSYS; return -1; } int rb_setup_fd_devpoll(rb_fde_t *F) { errno = ENOSYS; return -1; } #endif