/* * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA * * $Id: devpoll.c 3229 2007-03-05 17:23:07Z nenolod $ */ #include "config.h" #include "stdinc.h" #include #include "libcharybdis.h" #define POLL_LENGTH HARD_FDLIMIT static void devpoll_update_events(int, short, PF *); static int dpfd; static short fdmask[POLL_LENGTH]; static void devpoll_update_events(int, short, PF *); static void devpoll_write_update(int, int); /* #define NOTYET 1 */ /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ /* Private functions */ /* * 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)) libcharybdis_log("devpoll_write_update: dpfd write failed %d: %s", errno, strerror(errno)); /* Done! */ } 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; fde_t *F = comm_locate_fd(fd); switch (filter) { case COMM_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 COMM_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: #ifdef NOTYET libcharybdis_log("devpoll_update_events called with unknown filter: %hd", filter); #endif 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 */ /* * init_netio * * This is a needed exported function which will be called to initialise * the network loop code. */ void init_netio(void) { memset(&fdmask, 0, sizeof(fdmask)); dpfd = open("/dev/poll", O_RDWR); if(dpfd < 0) { fprintf(stderr, "init_netio: Couldn't open /dev/poll - %d: %s\n", errno, strerror(errno)); exit(115); /* Whee! */ } } /* * 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(int fd, fdlist_t list, unsigned int type, PF * handler, void *client_data, time_t timeout) { fde_t *F = comm_locate_fd(fd); s_assert(fd >= 0); s_assert(F->flags.open); /* Update the list, even though we're not using it .. */ F->list = list; if(type & COMM_SELECT_READ) { devpoll_update_events(fd, COMM_SELECT_READ, handler); F->read_handler = handler; F->read_data = client_data; } if(type & COMM_SELECT_WRITE) { devpoll_update_events(fd, COMM_SELECT_WRITE, handler); F->write_handler = handler; F->write_data = client_data; } if(timeout) F->timeout = CurrentTime + (timeout / 1000); } /* * 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. */ /* * 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. */ int comm_select(unsigned long delay) { int num, i; struct pollfd pollfds[POLL_LENGTH]; struct dvpoll dopoll; do { for (;;) { dopoll.dp_timeout = delay; dopoll.dp_nfds = POLL_LENGTH; dopoll.dp_fds = &pollfds[0]; num = ioctl(dpfd, DP_POLL, &dopoll); if(num >= 0) break; if(ignoreErrno(errno)) break; set_time(); return COMM_ERROR; } set_time(); if(num == 0) continue; for (i = 0; i < num; i++) { int fd = dopoll.dp_fds[i].fd; PF *hdl = NULL; fde_t *F = comm_locate_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(fd, 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, COMM_SELECT_READ, F->read_handler); } else libcharybdis_log("comm_select: Unhandled read event: fdmask: %x", fdmask[fd]); } if(F->flags.open == 0) 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(fd, F->write_data); /* See above similar code in the read case */ devpoll_update_events(fd, COMM_SELECT_WRITE, F->write_handler); } else libcharybdis_log("comm_select: Unhandled write event: fdmask: %x", fdmask[fd]); } if(dopoll.dp_fds[i].revents & POLLNVAL) { libcharybdis_log("revents was Invalid for %d", fd); } } return COMM_OK; } while (0); /* XXX Get here, we broke! */ return 0; }