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


/*
 * 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;
}

/*
 * 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:	1736
Committed:	Sun Jan 13 09:31:46 2013 UTC (12 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	4540 byte(s)
Log Message:	- Forward-port -r1732 [Dropped support for linux rt signals]
#	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	michael	1021	#include "list.h"
31	adx	30	#include "hook.h"
32			#include "ircd.h"
33			#include "s_bsd.h"
34	michael	1309	#include "log.h"
35	adx	30
36			/* I hate linux -- adrian */
37			#ifndef POLLRDNORM
38			#define POLLRDNORM POLLIN
39			#endif
40			#ifndef POLLWRNORM
41			#define POLLWRNORM POLLOUT
42			#endif
43
44			static struct pollfd *pollfds;
45			static int pollmax = -1; /* highest FD number */
46
47
48			/*
49			* init_netio
50			*
51			* This is a needed exported function which will be called to initialise
52			* the network loop code.
53			*/
54			void
55			init_netio(void)
56			{
57			int fd;
58
59			pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
60
61			for (fd = 0; fd < hard_fdlimit; fd++)
62			pollfds[fd].fd = -1;
63			}
64
65			/*
66			* find a spare slot in the fd list. We can optimise this out later!
67			* -- adrian
68			*/
69			static inline int
70			poll_findslot(void)
71			{
72			int i;
73
74			for (i = 0; i < hard_fdlimit; i++)
75			if (pollfds[i].fd == -1)
76			{
77			/* MATCH!!#$&$ /
78			return i;
79			}
80
81			assert(1 == 0);
82			/* NOTREACHED */
83			return -1;
84			}
85
86			/*
87			* comm_setselect
88			*
89			* This is a needed exported function which will be called to register
90			* and deregister interest in a pending IO state for a given FD.
91			*/
92			void
93			comm_setselect(fde_t F, unsigned int type, PF handler,
94			void *client_data, time_t timeout)
95			{
96			int new_events;
97
98			if ((type & COMM_SELECT_READ))
99			{
100			F->read_handler = handler;
101			F->read_data = client_data;
102			}
103
104			if ((type & COMM_SELECT_WRITE))
105			{
106			F->write_handler = handler;
107			F->write_data = client_data;
108			}
109
110			new_events = (F->read_handler ? POLLRDNORM : 0) \|
111			(F->write_handler ? POLLWRNORM : 0);
112
113			if (timeout != 0)
114			F->timeout = CurrentTime + (timeout / 1000);
115
116			if (new_events != F->evcache)
117			{
118			if (new_events == 0)
119			{
120			pollfds[F->comm_index].fd = -1;
121			pollfds[F->comm_index].revents = 0;
122
123			if (pollmax == F->comm_index)
124			while (pollmax >= 0 && pollfds[pollmax].fd == -1)
125			pollmax--;
126			}
127			else
128			{
129			if (F->evcache == 0)
130			{
131			F->comm_index = poll_findslot();
132			if (F->comm_index > pollmax)
133			pollmax = F->comm_index;
134
135			pollfds[F->comm_index].fd = F->fd;
136			}
137			pollfds[F->comm_index].events = new_events;
138			pollfds[F->comm_index].revents = 0;
139			}
140
141			F->evcache = new_events;
142			}
143			}
144
145			/*
146			* comm_select
147			*
148			* Called to do the new-style IO, courtesy of of squid (like most of this
149			* new IO code). This routine handles the stuff we've hidden in
150			* comm_setselect and fd_table[] and calls callbacks for IO ready
151			* events.
152			*/
153			void
154			comm_select(void)
155			{
156			int num, ci, revents;
157			PF *hdl;
158			fde_t *F;
159
160			/* XXX kill that +1 later ! -- adrian */
161			num = poll(pollfds, pollmax + 1, SELECT_DELAY);
162
163			set_time();
164
165			if (num < 0)
166			{
167			#ifdef HAVE_USLEEP
168			usleep(50000); /* avoid 99% CPU in comm_select */
169			#endif
170			return;
171			}
172
173			for (ci = 0; ci <= pollmax && num > 0; ci++)
174			{
175			if ((revents = pollfds[ci].revents) == 0 \|\| pollfds[ci].fd == -1)
176			continue;
177			num--;
178
179			F = lookup_fd(pollfds[ci].fd);
180			if (F == NULL \|\| !F->flags.open)
181			continue;
182
183			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
184			if ((hdl = F->read_handler) != NULL)
185			{
186			F->read_handler = NULL;
187			hdl(F, F->read_data);
188			if (!F->flags.open)
189			continue;
190			}
191
192			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
193			if ((hdl = F->write_handler) != NULL)
194			{
195			F->write_handler = NULL;
196			hdl(F, F->write_data);
197			if (!F->flags.open)
198			continue;
199			}
200
201			comm_setselect(F, 0, NULL, NULL, 0);
202			}
203			}
204	stu	908	#endif