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/* |
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* poll.C: poll(2) socket engine. |
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* |
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* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team |
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* Rights to this code are as documented in COPYING. |
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* |
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* |
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* Portions of this file were derived from sources bearing the following license: |
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* Rights to this code are documented in doc/pod/license.pod. |
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* Copyright © 2005-2007 Atheme Project (http://www.atheme.org) |
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*/ |
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|
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static char const rcsid[] = "$Id: poll.C,v 1.6 2007-09-05 11:23:15 pippijn Exp $"; |
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|
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#include <sys/poll.h> |
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|
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#include "atheme.h" |
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#include "internal.h" |
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#include "datastream.h" |
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#include "connection.h" |
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|
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/* |
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* linux does not provide POLLWRNORM by default, and we're not _XOPEN_SOURCE. |
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* so.... we have to do this crap below. |
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*/ |
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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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pollfd pollfds[FD_SETSIZE]; /* XXX We need a define indicating MAXCONN. */ |
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|
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/* |
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* init_socket_queues() |
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* |
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* inputs: |
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* none |
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* |
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* outputs: |
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* none |
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* |
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* side effects: |
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* when using select, we don't need to do anything here. |
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*/ |
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void |
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init_socket_queues (void) |
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{ |
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memset (&pollfds, 0, sizeof (pollfd) * FD_SETSIZE); |
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} |
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|
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/* |
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* update_poll_fds() |
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* |
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* inputs: |
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* none |
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* |
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* outputs: |
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* none |
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* |
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* side effects: |
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* registered sockets are prepared for the poll() loop. |
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*/ |
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static void |
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update_poll_fds (void) |
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{ |
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connection_t::list_type::iterator it = connection_t::list.begin (); |
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connection_t::list_type::iterator et = connection_t::list.end (); |
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int slot = 0; |
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|
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while (it != et) |
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{ |
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connection_t *cptr = *it; |
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|
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cptr->pollslot = slot; |
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|
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if (cptr->is_connecting () || sendq_nonempty (cptr)) |
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{ |
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pollfds[slot].fd = cptr->fd; |
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pollfds[slot].events |= POLLWRNORM; |
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pollfds[slot].revents = 0; |
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} |
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else |
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{ |
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pollfds[slot].fd = cptr->fd; |
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pollfds[slot].events |= POLLRDNORM; |
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pollfds[slot].revents = 0; |
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} |
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slot++; |
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++it; |
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} |
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} |
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|
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/* |
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* connection_t::select() |
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* |
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* inputs: |
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* delay in microseconds |
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* |
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* outputs: |
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* none |
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* |
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* side effects: |
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* registered sockets and their associated handlers are acted on. |
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*/ |
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void |
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connection_t::select (time_t delay) |
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{ |
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int sr; |
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connection_t::list_type::iterator it = connection_t::list.begin (); |
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connection_t::list_type::iterator et = connection_t::list.end (); |
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int slot; |
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|
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update_poll_fds (); |
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|
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if ((sr = poll (pollfds, connection_t::list.size (), delay / 100)) > 0) |
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{ |
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/* Iterate twice, so we don't touch freed memory if |
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* a connection is closed. |
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* -- jilles */ |
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while (it != et) |
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{ |
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connection_t *cptr = *it; |
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++it; // increment here or continue will cause an endless loop |
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slot = cptr->pollslot; |
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|
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if (pollfds[slot].revents == 0) |
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continue; |
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|
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if (pollfds[slot].revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) |
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{ |
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pollfds[slot].events &= ~(POLLRDNORM | POLLIN | POLLHUP | POLLERR); |
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cptr->read_handler (cptr); |
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} |
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} |
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|
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for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it) |
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{ |
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connection_t *cptr = *it; |
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slot = cptr->pollslot; |
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|
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if (pollfds[slot].revents == 0) |
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continue; |
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if (pollfds[slot].revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) |
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{ |
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pollfds[slot].events &= ~(POLLWRNORM | POLLOUT | POLLHUP | POLLERR); |
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if (cptr->is_connecting ()) |
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cptr->callback.connected (cptr); |
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else |
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cptr->write_handler (cptr); |
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} |
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} |
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|
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for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it) |
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{ |
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connection_t *cptr = *it; |
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if (cptr->flags & CF_DEAD) |
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cptr->close (); |
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} |
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} |
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} |