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/* |
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
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* |
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* Copyright (c) 2000-2016 ircd-hybrid 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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|
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/*! \file s_bsd_poll.c |
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* \brief POSIX poll() compatible network routines. |
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* \version $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL |
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#include <sys/poll.h> |
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#include "fdlist.h" |
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#include "list.h" |
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#include "memory.h" |
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#include "ircd.h" |
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#include "s_bsd.h" |
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#include "log.h" |
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|
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/* I hate linux -- adrian */ |
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#ifndef POLLRDNORM |
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#define POLLRDNORM POLLIN |
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#endif |
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#ifndef POLLWRNORM |
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#define POLLWRNORM POLLOUT |
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#endif |
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|
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static int pollfds_size; |
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static struct pollfd *pollfds; |
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static int pollnum; |
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|
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|
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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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pollfds_size = hard_fdlimit; |
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pollfds = xcalloc(sizeof(struct pollfd) * pollfds_size); |
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} |
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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(fde_t *F, unsigned int type, void (*handler)(fde_t *, void *), |
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void *client_data, time_t timeout) |
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{ |
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int new_events; |
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|
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if ((type & COMM_SELECT_READ)) |
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{ |
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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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|
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if ((type & COMM_SELECT_WRITE)) |
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{ |
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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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new_events = (F->read_handler ? POLLRDNORM : 0) | |
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(F->write_handler ? POLLWRNORM : 0); |
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|
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if (timeout != 0) |
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{ |
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F->timeout = CurrentTime + (timeout / 1000); |
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F->timeout_handler = handler; |
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F->timeout_data = client_data; |
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} |
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|
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if (new_events != F->evcache) |
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{ |
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if (new_events == 0) |
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{ |
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if (F->comm_index != pollnum - 1) |
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{ |
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fde_t *other = lookup_fd(pollfds[pollnum - 1].fd); |
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|
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pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd; |
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pollfds[F->comm_index].events = pollfds[pollnum - 1].events; |
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pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents; |
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|
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assert(other); |
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other->comm_index = F->comm_index; |
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} |
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|
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F->comm_index = -1; |
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--pollnum; |
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} |
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else |
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{ |
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if (F->evcache == 0) |
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{ |
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if (pollnum >= pollfds_size) |
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{ |
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pollfds_size *= 2; |
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pollfds = xrealloc(pollfds, sizeof(struct pollfd) * pollfds_size); |
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} |
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|
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F->comm_index = pollnum++; |
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pollfds[F->comm_index].fd = F->fd; |
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} |
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|
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pollfds[F->comm_index].events = new_events; |
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pollfds[F->comm_index].revents = 0; |
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} |
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|
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F->evcache = new_events; |
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} |
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} |
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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 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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void |
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comm_select(void) |
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{ |
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int num, ci; |
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void (*hdl)(fde_t *, void *); |
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fde_t *F; |
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|
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num = poll(pollfds, pollnum, SELECT_DELAY); |
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|
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set_time(); |
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|
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if (num < 0) |
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{ |
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const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 }; |
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nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */ |
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return; |
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} |
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|
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for (ci = 0; ci < pollnum && num > 0; ci++) |
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{ |
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int revents = pollfds[ci].revents; |
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|
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if (revents == 0) |
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continue; |
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num--; |
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|
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F = lookup_fd(pollfds[ci].fd); |
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assert(F); |
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if (!F->flags.open) |
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continue; |
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|
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if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) |
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{ |
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if ((hdl = F->read_handler)) |
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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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if (!F->flags.open) |
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continue; |
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} |
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} |
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|
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if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) |
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{ |
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if ((hdl = F->write_handler)) |
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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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if (!F->flags.open) |
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continue; |
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} |
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} |
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|
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comm_setselect(F, 0, NULL, NULL, 0); |
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} |
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} |
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#endif |
