ircd-hybrid-7.3/src/s_bsd_poll.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_bsd_poll.c: POSIX poll() compatible network routines.
 *
 *  Originally by Adrian Chadd <adrian@creative.net.au>
 *  Copyright (C) 2002 Hybrid 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
 *
 *  $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
#include <sys/poll.h>
#include "fdlist.h"
#include "hook.h"
#include "ircd.h"
#include "s_bsd.h"
#include "s_log.h"

/* I hate linux -- adrian */
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif

static struct pollfd *pollfds;
static int pollmax = -1;  /* highest FD number */
static dlink_node *hookptr;

/*
 * changing_fdlimit
 *
 * Resize pollfds array if necessary.
 */
static void *
changing_fdlimit(va_list args)
{
  int old_fdlimit = hard_fdlimit;

  pass_callback(hookptr, va_arg(args, int));

  if (hard_fdlimit != old_fdlimit)
    pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * hard_fdlimit);

  return NULL;
}

/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(void)
{
  int fd;

  pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);

  for (fd = 0; fd < hard_fdlimit; fd++)
    pollfds[fd].fd = -1;

  hookptr = install_hook(fdlimit_cb, changing_fdlimit);
}

/*
 * 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 < hard_fdlimit; i++)
    if (pollfds[i].fd == -1)
    {
      /* MATCH!!#$*&$ */
      return i;
    }

  assert(1 == 0);
  /* NOTREACHED */
  return -1;
}

/*
 * 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(fde_t *F, unsigned int type, PF *handler,
               void *client_data, time_t timeout)
{  
  int new_events;

  if ((type & COMM_SELECT_READ))
  {
    F->read_handler = handler;
    F->read_data = client_data;
  }

  if ((type & COMM_SELECT_WRITE))
  {
    F->write_handler = handler;
    F->write_data = client_data;
  }

  new_events = (F->read_handler ? POLLRDNORM : 0) |
    (F->write_handler ? POLLWRNORM : 0);

  if (timeout != 0)
    F->timeout = CurrentTime + (timeout / 1000);

  if (new_events != F->evcache)
  {
    if (new_events == 0)
    {
      pollfds[F->comm_index].fd = -1;
      pollfds[F->comm_index].revents = 0;

      if (pollmax == F->comm_index)
        while (pollmax >= 0 && pollfds[pollmax].fd == -1)
          pollmax--;
    }
    else
    {
      if (F->evcache == 0)
      {
        F->comm_index = poll_findslot();
        if (F->comm_index > pollmax)
          pollmax = F->comm_index;

        pollfds[F->comm_index].fd = F->fd;
      }
      pollfds[F->comm_index].events = new_events;
      pollfds[F->comm_index].revents = 0;
    }

    F->evcache = new_events;
  }
}
 
/*
 * comm_select
 *
 * Called to do the new-style IO, courtesy of 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.
 */
void
comm_select(void)
{
  int num, ci, revents;
  PF *hdl;
  fde_t *F;

  /* XXX kill that +1 later ! -- adrian */
  num = poll(pollfds, pollmax + 1, SELECT_DELAY);

  set_time();

  if (num < 0)
  {
#ifdef HAVE_USLEEP
    usleep(50000);  /* avoid 99% CPU in comm_select */
#endif
    return;
  }

  for (ci = 0; ci <= pollmax && num > 0; ci++)
  {
    if ((revents = pollfds[ci].revents) == 0 || pollfds[ci].fd == -1)
      continue;
    num--;

    F = lookup_fd(pollfds[ci].fd);
    if (F == NULL || !F->flags.open)
      continue;

    if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
      if ((hdl = F->read_handler) != NULL)
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);
        if (!F->flags.open)
          continue;
      }

    if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
      if ((hdl = F->write_handler) != NULL)
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);
        if (!F->flags.open)
          continue;
      }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	908
Committed:	Sun Nov 4 23:21:51 2007 UTC (17 years, 9 months ago) by stu
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_bsd_poll.c*
File size:	4930 byte(s)
Log Message:	Completely redo the build system. Now uses libtool and automake. Suggest you clean out your tree and then do ./autogen.sh.
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* s_bsd_poll.c: POSIX poll() compatible network routines.
4			*
5			* Originally by Adrian Chadd <adrian@creative.net.au>
6			* Copyright (C) 2002 Hybrid Development Team
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21			* USA
22			*
23	knight	31	* $Id$
24	adx	30	*/
25
26			#include "stdinc.h"
27	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
28	adx	30	#include <sys/poll.h>
29			#include "fdlist.h"
30			#include "hook.h"
31			#include "ircd.h"
32			#include "s_bsd.h"
33			#include "s_log.h"
34
35			/* I hate linux -- adrian */
36			#ifndef POLLRDNORM
37			#define POLLRDNORM POLLIN
38			#endif
39			#ifndef POLLWRNORM
40			#define POLLWRNORM POLLOUT
41			#endif
42
43			static struct pollfd *pollfds;
44			static int pollmax = -1; /* highest FD number */
45			static dlink_node *hookptr;
46
47			/*
48			* changing_fdlimit
49			*
50			* Resize pollfds array if necessary.
51			*/
52			static void *
53			changing_fdlimit(va_list args)
54			{
55			int old_fdlimit = hard_fdlimit;
56
57			pass_callback(hookptr, va_arg(args, int));
58
59			if (hard_fdlimit != old_fdlimit)
60			pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * hard_fdlimit);
61
62			return NULL;
63			}
64
65			/*
66			* init_netio
67			*
68			* This is a needed exported function which will be called to initialise
69			* the network loop code.
70			*/
71			void
72			init_netio(void)
73			{
74			int fd;
75
76			pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
77
78			for (fd = 0; fd < hard_fdlimit; fd++)
79			pollfds[fd].fd = -1;
80
81			hookptr = install_hook(fdlimit_cb, changing_fdlimit);
82			}
83
84			/*
85			* find a spare slot in the fd list. We can optimise this out later!
86			* -- adrian
87			*/
88			static inline int
89			poll_findslot(void)
90			{
91			int i;
92
93			for (i = 0; i < hard_fdlimit; i++)
94			if (pollfds[i].fd == -1)
95			{
96			/* MATCH!!#$&$ /
97			return i;
98			}
99
100			assert(1 == 0);
101			/* NOTREACHED */
102			return -1;
103			}
104
105			/*
106			* comm_setselect
107			*
108			* This is a needed exported function which will be called to register
109			* and deregister interest in a pending IO state for a given FD.
110			*/
111			void
112			comm_setselect(fde_t F, unsigned int type, PF handler,
113			void *client_data, time_t timeout)
114			{
115			int new_events;
116
117			if ((type & COMM_SELECT_READ))
118			{
119			F->read_handler = handler;
120			F->read_data = client_data;
121			}
122
123			if ((type & COMM_SELECT_WRITE))
124			{
125			F->write_handler = handler;
126			F->write_data = client_data;
127			}
128
129			new_events = (F->read_handler ? POLLRDNORM : 0) \|
130			(F->write_handler ? POLLWRNORM : 0);
131
132			if (timeout != 0)
133			F->timeout = CurrentTime + (timeout / 1000);
134
135			if (new_events != F->evcache)
136			{
137			if (new_events == 0)
138			{
139			pollfds[F->comm_index].fd = -1;
140			pollfds[F->comm_index].revents = 0;
141
142			if (pollmax == F->comm_index)
143			while (pollmax >= 0 && pollfds[pollmax].fd == -1)
144			pollmax--;
145			}
146			else
147			{
148			if (F->evcache == 0)
149			{
150			F->comm_index = poll_findslot();
151			if (F->comm_index > pollmax)
152			pollmax = F->comm_index;
153
154			pollfds[F->comm_index].fd = F->fd;
155			}
156			pollfds[F->comm_index].events = new_events;
157			pollfds[F->comm_index].revents = 0;
158			}
159
160			F->evcache = new_events;
161			}
162			}
163
164			/*
165			* comm_select
166			*
167			* Called to do the new-style IO, courtesy of of squid (like most of this
168			* new IO code). This routine handles the stuff we've hidden in
169			* comm_setselect and fd_table[] and calls callbacks for IO ready
170			* events.
171			*/
172			void
173			comm_select(void)
174			{
175			int num, ci, revents;
176			PF *hdl;
177			fde_t *F;
178
179			/* XXX kill that +1 later ! -- adrian */
180			num = poll(pollfds, pollmax + 1, SELECT_DELAY);
181
182			set_time();
183
184			if (num < 0)
185			{
186			#ifdef HAVE_USLEEP
187			usleep(50000); /* avoid 99% CPU in comm_select */
188			#endif
189			return;
190			}
191
192			for (ci = 0; ci <= pollmax && num > 0; ci++)
193			{
194			if ((revents = pollfds[ci].revents) == 0 \|\| pollfds[ci].fd == -1)
195			continue;
196			num--;
197
198			F = lookup_fd(pollfds[ci].fd);
199			if (F == NULL \|\| !F->flags.open)
200			continue;
201
202			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
203			if ((hdl = F->read_handler) != NULL)
204			{
205			F->read_handler = NULL;
206			hdl(F, F->read_data);
207			if (!F->flags.open)
208			continue;
209			}
210
211			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
212			if ((hdl = F->write_handler) != NULL)
213			{
214			F->write_handler = NULL;
215			hdl(F, F->write_data);
216			if (!F->flags.open)
217			continue;
218			}
219
220			comm_setselect(F, 0, NULL, NULL, 0);
221			}
222			}
223	stu	908	#endif