mirror of
https://github.com/matrix-construct/construct
synced 2024-09-10 10:41:36 +02:00
305 lines
7.3 KiB
C
305 lines
7.3 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* s_bsd_poll.c: POSIX 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 <adrian@creative.net.au>
|
|
* 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: poll.c 3528 2007-07-07 08:08:23Z nenolod $
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "stdinc.h"
|
|
#include <sys/poll.h>
|
|
|
|
#include "libcharybdis.h"
|
|
|
|
/* I hate linux -- adrian */
|
|
#ifndef POLLRDNORM
|
|
#define POLLRDNORM POLLIN
|
|
#endif
|
|
#ifndef POLLWRNORM
|
|
#define POLLWRNORM POLLOUT
|
|
#endif
|
|
|
|
struct _pollfd_list
|
|
{
|
|
struct pollfd *pollfds;
|
|
int maxindex; /* highest FD number */
|
|
int allocated;
|
|
};
|
|
|
|
typedef struct _pollfd_list pollfd_list_t;
|
|
|
|
pollfd_list_t pollfd_list;
|
|
static void poll_update_pollfds(int, short, PF *);
|
|
static unsigned long last_count = 0;
|
|
static unsigned long empty_count = 0;
|
|
|
|
/*
|
|
* init_netio
|
|
*
|
|
* This is a needed exported function which will be called to initialise
|
|
* the network loop code.
|
|
*/
|
|
void
|
|
init_netio(void)
|
|
{
|
|
int fd;
|
|
int maxconn = comm_get_maxconnections();
|
|
|
|
pollfd_list.pollfds = calloc(sizeof(struct pollfd), maxconn);
|
|
|
|
for (fd = 0; fd < maxconn; fd++)
|
|
pollfd_list.pollfds[fd].fd = -1;
|
|
|
|
pollfd_list.maxindex = 0;
|
|
pollfd_list.allocated = maxconn;
|
|
}
|
|
|
|
static inline void
|
|
resize_poll_array(int fd)
|
|
{
|
|
int i, old_value = pollfd_list.allocated;
|
|
|
|
if (fd < pollfd_list.allocated)
|
|
return;
|
|
|
|
pollfd_list.allocated += 1024;
|
|
pollfd_list.pollfds = MyRealloc(pollfd_list.pollfds, pollfd_list.allocated * sizeof(struct pollfd));
|
|
|
|
/* because realloced memory can contain junk, we have to zero it out. */
|
|
memset(&pollfd_list.pollfds[old_value+1], 0, sizeof(struct pollfd) * 1024);
|
|
|
|
for (i = old_value + 1; i <= pollfd_list.allocated; i++)
|
|
pollfd_list.pollfds[i].fd = -1;
|
|
}
|
|
|
|
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
|
|
/* Private functions */
|
|
|
|
/*
|
|
* find a spare slot in the fd list. We can optimise this out later!
|
|
* -- adrian
|
|
*/
|
|
static inline int
|
|
poll_findslot(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < pollfd_list.allocated; i++)
|
|
{
|
|
if(pollfd_list.pollfds[i].fd == -1)
|
|
{
|
|
/* MATCH!!#$*&$ */
|
|
return i;
|
|
}
|
|
}
|
|
|
|
s_assert(1 == 0);
|
|
/* NOTREACHED */
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* set and clear entries in the pollfds[] array.
|
|
*/
|
|
static void
|
|
poll_update_pollfds(int fd, short event, PF * handler)
|
|
{
|
|
fde_t *F = comm_locate_fd(fd);
|
|
int comm_index;
|
|
|
|
resize_poll_array(fd);
|
|
|
|
if (F == NULL)
|
|
F = comm_add_fd(fd);
|
|
|
|
if(F->comm_index < 0)
|
|
F->comm_index = poll_findslot();
|
|
|
|
comm_index = F->comm_index;
|
|
|
|
/* Update the events */
|
|
if(handler)
|
|
{
|
|
F->list = FDLIST_IDLECLIENT;
|
|
pollfd_list.pollfds[comm_index].events |= event;
|
|
pollfd_list.pollfds[comm_index].fd = fd;
|
|
/* update maxindex here */
|
|
if(comm_index > pollfd_list.maxindex)
|
|
pollfd_list.maxindex = comm_index;
|
|
}
|
|
else
|
|
{
|
|
if(comm_index >= 0)
|
|
{
|
|
pollfd_list.pollfds[comm_index].events &= ~event;
|
|
if(pollfd_list.pollfds[comm_index].events == 0)
|
|
{
|
|
pollfd_list.pollfds[comm_index].fd = -1;
|
|
pollfd_list.pollfds[comm_index].revents = 0;
|
|
F->comm_index = -1;
|
|
F->list = FDLIST_NONE;
|
|
|
|
/* update pollfd_list.maxindex here */
|
|
if(comm_index == pollfd_list.maxindex)
|
|
while (pollfd_list.maxindex >= 0 &&
|
|
pollfd_list.pollfds[pollfd_list.maxindex].fd == -1)
|
|
pollfd_list.maxindex--;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
|
|
/* Public functions */
|
|
|
|
/*
|
|
* 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);
|
|
|
|
if(type & COMM_SELECT_READ)
|
|
{
|
|
F->read_handler = handler;
|
|
F->read_data = client_data;
|
|
poll_update_pollfds(fd, POLLRDNORM, handler);
|
|
}
|
|
if(type & COMM_SELECT_WRITE)
|
|
{
|
|
F->write_handler = handler;
|
|
F->write_data = client_data;
|
|
poll_update_pollfds(fd, POLLWRNORM, handler);
|
|
}
|
|
if(timeout)
|
|
F->timeout = CurrentTime + (timeout / 1000);
|
|
}
|
|
|
|
static void
|
|
irc_sleep(unsigned long useconds)
|
|
{
|
|
#ifdef HAVE_NANOSLEEP
|
|
struct timespec t;
|
|
t.tv_sec = useconds / (unsigned long) 1000000;
|
|
t.tv_nsec = (useconds % (unsigned long) 1000000) * 1000;
|
|
nanosleep(&t, (struct timespec *) NULL);
|
|
#else
|
|
struct timeval t;
|
|
t.tv_sec = 0;
|
|
t.tv_usec = useconds;
|
|
select(0, NULL, NULL, NULL, &t);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
/* int comm_select_fdlist(unsigned long delay)
|
|
* Input: The maximum time to delay.
|
|
* Output: Returns -1 on error, 0 on success.
|
|
* Side-effects: Deregisters future interest in IO and calls the handlers
|
|
* if an event occurs for an FD.
|
|
* Comments: 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.
|
|
* 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;
|
|
int fd;
|
|
int ci;
|
|
unsigned long ndelay;
|
|
PF *hdl;
|
|
|
|
if(last_count > 0)
|
|
{
|
|
empty_count = 0;
|
|
ndelay = 0;
|
|
}
|
|
else {
|
|
ndelay = ++empty_count * 15000 ;
|
|
if(ndelay > delay * 1000)
|
|
ndelay = delay * 1000;
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
/* XXX kill that +1 later ! -- adrian */
|
|
if(ndelay > 0)
|
|
irc_sleep(ndelay);
|
|
last_count = num = poll(pollfd_list.pollfds, pollfd_list.maxindex + 1, 0);
|
|
if(num >= 0)
|
|
break;
|
|
if(ignoreErrno(errno))
|
|
continue;
|
|
/* error! */
|
|
set_time();
|
|
return -1;
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* update current time again, eww.. */
|
|
set_time();
|
|
|
|
if(num == 0)
|
|
return 0;
|
|
/* XXX we *could* optimise by falling out after doing num fds ... */
|
|
for (ci = 0; ci < pollfd_list.maxindex + 1; ci++)
|
|
{
|
|
fde_t *F;
|
|
int revents;
|
|
if(((revents = pollfd_list.pollfds[ci].revents) == 0) ||
|
|
(pollfd_list.pollfds[ci].fd) == -1)
|
|
continue;
|
|
fd = pollfd_list.pollfds[ci].fd;
|
|
F = comm_locate_fd(fd);
|
|
if(revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
|
|
{
|
|
hdl = F->read_handler;
|
|
F->read_handler = NULL;
|
|
poll_update_pollfds(fd, POLLRDNORM, NULL);
|
|
if(hdl)
|
|
hdl(fd, F->read_data);
|
|
}
|
|
if(revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
|
|
{
|
|
hdl = F->write_handler;
|
|
F->write_handler = NULL;
|
|
poll_update_pollfds(fd, POLLWRNORM, NULL);
|
|
if(hdl)
|
|
hdl(fd, F->write_data);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|