trunk/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"
#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);
  }
}
Revision:	32
Committed:	Sun Oct 2 20:41:23 2005 UTC (20 years, 9 months ago) by knight
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/src/s_bsd_poll.c*
File size:	4871 byte(s)
Log Message:	- svn:keywords
#	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			#include <sys/poll.h>
28			#include "fdlist.h"
29			#include "hook.h"
30			#include "ircd.h"
31			#include "s_bsd.h"
32			#include "s_log.h"
33
34			/* I hate linux -- adrian */
35			#ifndef POLLRDNORM
36			#define POLLRDNORM POLLIN
37			#endif
38			#ifndef POLLWRNORM
39			#define POLLWRNORM POLLOUT
40			#endif
41
42			static struct pollfd *pollfds;
43			static int pollmax = -1; /* highest FD number */
44			static dlink_node *hookptr;
45
46			/*
47			* changing_fdlimit
48			*
49			* Resize pollfds array if necessary.
50			*/
51			static void *
52			changing_fdlimit(va_list args)
53			{
54			int old_fdlimit = hard_fdlimit;
55
56			pass_callback(hookptr, va_arg(args, int));
57
58			if (hard_fdlimit != old_fdlimit)
59			pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * hard_fdlimit);
60
61			return NULL;
62			}
63
64			/*
65			* init_netio
66			*
67			* This is a needed exported function which will be called to initialise
68			* the network loop code.
69			*/
70			void
71			init_netio(void)
72			{
73			int fd;
74
75			pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
76
77			for (fd = 0; fd < hard_fdlimit; fd++)
78			pollfds[fd].fd = -1;
79
80			hookptr = install_hook(fdlimit_cb, changing_fdlimit);
81			}
82
83			/*
84			* find a spare slot in the fd list. We can optimise this out later!
85			* -- adrian
86			*/
87			static inline int
88			poll_findslot(void)
89			{
90			int i;
91
92			for (i = 0; i < hard_fdlimit; i++)
93			if (pollfds[i].fd == -1)
94			{
95			/* MATCH!!#$&$ /
96			return i;
97			}
98
99			assert(1 == 0);
100			/* NOTREACHED */
101			return -1;
102			}
103
104			/*
105			* comm_setselect
106			*
107			* This is a needed exported function which will be called to register
108			* and deregister interest in a pending IO state for a given FD.
109			*/
110			void
111			comm_setselect(fde_t F, unsigned int type, PF handler,
112			void *client_data, time_t timeout)
113			{
114			int new_events;
115
116			if ((type & COMM_SELECT_READ))
117			{
118			F->read_handler = handler;
119			F->read_data = client_data;
120			}
121
122			if ((type & COMM_SELECT_WRITE))
123			{
124			F->write_handler = handler;
125			F->write_data = client_data;
126			}
127
128			new_events = (F->read_handler ? POLLRDNORM : 0) \|
129			(F->write_handler ? POLLWRNORM : 0);
130
131			if (timeout != 0)
132			F->timeout = CurrentTime + (timeout / 1000);
133
134			if (new_events != F->evcache)
135			{
136			if (new_events == 0)
137			{
138			pollfds[F->comm_index].fd = -1;
139			pollfds[F->comm_index].revents = 0;
140
141			if (pollmax == F->comm_index)
142			while (pollmax >= 0 && pollfds[pollmax].fd == -1)
143			pollmax--;
144			}
145			else
146			{
147			if (F->evcache == 0)
148			{
149			F->comm_index = poll_findslot();
150			if (F->comm_index > pollmax)
151			pollmax = F->comm_index;
152
153			pollfds[F->comm_index].fd = F->fd;
154			}
155			pollfds[F->comm_index].events = new_events;
156			pollfds[F->comm_index].revents = 0;
157			}
158
159			F->evcache = new_events;
160			}
161			}
162
163			/*
164			* comm_select
165			*
166			* Called to do the new-style IO, courtesy of of squid (like most of this
167			* new IO code). This routine handles the stuff we've hidden in
168			* comm_setselect and fd_table[] and calls callbacks for IO ready
169			* events.
170			*/
171			void
172			comm_select(void)
173			{
174			int num, ci, revents;
175			PF *hdl;
176			fde_t *F;
177
178			/* XXX kill that +1 later ! -- adrian */
179			num = poll(pollfds, pollmax + 1, SELECT_DELAY);
180
181			set_time();
182
183			if (num < 0)
184			{
185			#ifdef HAVE_USLEEP
186			usleep(50000); /* avoid 99% CPU in comm_select */
187			#endif
188			return;
189			}
190
191			for (ci = 0; ci <= pollmax && num > 0; ci++)
192			{
193			if ((revents = pollfds[ci].revents) == 0 \|\| pollfds[ci].fd == -1)
194			continue;
195			num--;
196
197			F = lookup_fd(pollfds[ci].fd);
198			if (F == NULL \|\| !F->flags.open)
199			continue;
200
201			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
202			if ((hdl = F->read_handler) != NULL)
203			{
204			F->read_handler = NULL;
205			hdl(F, F->read_data);
206			if (!F->flags.open)
207			continue;
208			}
209
210			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
211			if ((hdl = F->write_handler) != NULL)
212			{
213			F->write_handler = NULL;
214			hdl(F, F->write_data);
215			if (!F->flags.open)
216			continue;
217			}
218
219			comm_setselect(F, 0, NULL, NULL, 0);
220			}
221			}