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 "memory.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:	2650
Committed:	Tue Dec 10 19:46:48 2013 UTC (11 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	4652 byte(s)
Log Message:	- s_bsd_select.c, s_bsd_devpoll.c, s_bsd_epoll.c, s_bsd_kqueue.c, s_bsd_poll.c: style corrections
#	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	michael	2627	#include "memory.h"
32	adx	30	#include "hook.h"
33			#include "ircd.h"
34			#include "s_bsd.h"
35	michael	1309	#include "log.h"
36	adx	30
37			/* I hate linux -- adrian */
38			#ifndef POLLRDNORM
39			#define POLLRDNORM POLLIN
40			#endif
41			#ifndef POLLWRNORM
42			#define POLLWRNORM POLLOUT
43			#endif
44
45			static struct pollfd *pollfds;
46			static int pollmax = -1; /* highest FD number */
47
48
49			/*
50			* init_netio
51			*
52			* This is a needed exported function which will be called to initialise
53			* the network loop code.
54			*/
55			void
56			init_netio(void)
57			{
58			int fd;
59
60			pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
61
62			for (fd = 0; fd < hard_fdlimit; fd++)
63			pollfds[fd].fd = -1;
64			}
65
66			/*
67			* find a spare slot in the fd list. We can optimise this out later!
68			* -- adrian
69			*/
70			static inline int
71			poll_findslot(void)
72			{
73			int i;
74
75			for (i = 0; i < hard_fdlimit; i++)
76			if (pollfds[i].fd == -1)
77			{
78			/* MATCH!!#$&$ /
79			return i;
80			}
81
82			assert(1 == 0);
83			/* NOTREACHED */
84			return -1;
85			}
86
87			/*
88			* comm_setselect
89			*
90			* This is a needed exported function which will be called to register
91			* and deregister interest in a pending IO state for a given FD.
92			*/
93			void
94			comm_setselect(fde_t F, unsigned int type, PF handler,
95			void *client_data, time_t timeout)
96			{
97			int new_events;
98
99			if ((type & COMM_SELECT_READ))
100			{
101			F->read_handler = handler;
102			F->read_data = client_data;
103			}
104
105			if ((type & COMM_SELECT_WRITE))
106			{
107			F->write_handler = handler;
108			F->write_data = client_data;
109			}
110
111			new_events = (F->read_handler ? POLLRDNORM : 0) \|
112	michael	2650	(F->write_handler ? POLLWRNORM : 0);
113	adx	30
114			if (timeout != 0)
115			F->timeout = CurrentTime + (timeout / 1000);
116
117			if (new_events != F->evcache)
118			{
119			if (new_events == 0)
120			{
121			pollfds[F->comm_index].fd = -1;
122			pollfds[F->comm_index].revents = 0;
123
124			if (pollmax == F->comm_index)
125			while (pollmax >= 0 && pollfds[pollmax].fd == -1)
126	michael	2650	pollmax--;
127	adx	30	}
128			else
129			{
130			if (F->evcache == 0)
131			{
132			F->comm_index = poll_findslot();
133	michael	2650	if (F->comm_index > pollmax)
134			pollmax = F->comm_index;
135	adx	30
136	michael	2650	pollfds[F->comm_index].fd = F->fd;
137	adx	30	}
138	michael	2650
139	adx	30	pollfds[F->comm_index].events = new_events;
140			pollfds[F->comm_index].revents = 0;
141			}
142
143			F->evcache = new_events;
144			}
145			}
146
147			/*
148			* comm_select
149			*
150			* Called to do the new-style IO, courtesy of of squid (like most of this
151			* new IO code). This routine handles the stuff we've hidden in
152			* comm_setselect and fd_table[] and calls callbacks for IO ready
153			* events.
154			*/
155			void
156			comm_select(void)
157			{
158			int num, ci, revents;
159			PF *hdl;
160			fde_t *F;
161
162			/* XXX kill that +1 later ! -- adrian */
163			num = poll(pollfds, pollmax + 1, SELECT_DELAY);
164
165			set_time();
166
167			if (num < 0)
168			{
169			#ifdef HAVE_USLEEP
170			usleep(50000); /* avoid 99% CPU in comm_select */
171			#endif
172			return;
173			}
174
175			for (ci = 0; ci <= pollmax && num > 0; ci++)
176			{
177			if ((revents = pollfds[ci].revents) == 0 \|\| pollfds[ci].fd == -1)
178			continue;
179			num--;
180
181			F = lookup_fd(pollfds[ci].fd);
182			if (F == NULL \|\| !F->flags.open)
183			continue;
184
185			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
186	michael	2650	{
187	adx	30	if ((hdl = F->read_handler) != NULL)
188			{
189			F->read_handler = NULL;
190			hdl(F, F->read_data);
191	michael	2650	if (!F->flags.open)
192			continue;
193	adx	30	}
194	michael	2650	}
195	adx	30
196			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
197	michael	2650	{
198	adx	30	if ((hdl = F->write_handler) != NULL)
199			{
200			F->write_handler = NULL;
201			hdl(F, F->write_data);
202	michael	2650	if (!F->flags.open)
203			continue;
204	adx	30	}
205	michael	2650	}
206	adx	30
207			comm_setselect(F, 0, NULL, NULL, 0);
208			}
209			}
210	stu	908	#endif