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/* |
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* s_bsd_select.c: select() compatible network routines. |
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* |
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* Originally by Adrian Chadd <adrian@creative.net.au> |
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* Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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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_SELECT |
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#include "list.h" |
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#include "fdlist.h" |
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#include "hook.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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/* |
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* Note that this is only a single list - multiple lists is kinda pointless |
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* under select because the list size is a function of the highest FD :-) |
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* -- adrian |
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*/ |
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|
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static fd_set select_readfds, tmpreadfds; |
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static fd_set select_writefds, tmpwritefds; |
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static int highest_fd = -1; |
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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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FD_ZERO(&select_readfds); |
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FD_ZERO(&select_writefds); |
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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, PF *handler, |
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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 ? COMM_SELECT_READ : 0) | |
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(F->write_handler ? COMM_SELECT_WRITE : 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 & COMM_SELECT_READ)) |
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FD_SET(F->fd, &select_readfds); |
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else |
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{ |
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FD_CLR(F->fd, &select_readfds); |
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FD_CLR(F->fd, &tmpreadfds); |
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} |
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|
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if ((new_events & COMM_SELECT_WRITE)) |
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FD_SET(F->fd, &select_writefds); |
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else |
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{ |
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FD_CLR(F->fd, &select_writefds); |
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FD_CLR(F->fd, &tmpwritefds); |
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} |
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|
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if (new_events == 0) |
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{ |
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if (highest_fd == F->fd) |
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while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) || |
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FD_ISSET(highest_fd, &select_writefds))) |
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highest_fd--; |
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} |
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else if (F->evcache == 0) |
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if (F->fd > highest_fd) |
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highest_fd = F->fd; |
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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 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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struct timeval to; |
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int num, fd; |
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fde_t *F; |
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PF *hdl; |
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|
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/* Copy over the read/write sets so we don't have to rebuild em */ |
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memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set)); |
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memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set)); |
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|
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to.tv_sec = 0; |
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to.tv_usec = SELECT_DELAY * 1000; |
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num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to); |
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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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#ifdef HAVE_USLEEP |
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usleep(50000); |
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#endif |
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return; |
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} |
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|
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for (fd = 0; fd <= highest_fd && num > 0; fd++) |
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{ |
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if (FD_ISSET(fd, &tmpreadfds) || FD_ISSET(fd, &tmpwritefds)) |
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{ |
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num--; |
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|
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F = lookup_fd(fd); |
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if (F == NULL || !F->flags.open) |
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continue; |
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|
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if (FD_ISSET(fd, &tmpreadfds)) |
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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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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 (FD_ISSET(fd, &tmpwritefds)) |
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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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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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} |
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#endif |
