trunk/src/s_bsd_poll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2014 ircd-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
 */

/*! \file s_bsd_poll.c
 * \brief POSIX poll() compatible network routines.
 * \version $Id$
 */

#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);
    F->timeout_handler = handler;
    F->timeout_data = client_data;
  }

  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:	2916
Committed:	Sat Jan 25 21:09:18 2014 UTC (11 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	4718 byte(s)
Log Message:	- Clean up all files in include/ (fixed indentation, removed whitespaces/tabs) - Fixed copyright years
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 2000-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19			* USA
20			*/
21
22	michael	2916	/*! \file s_bsd_poll.c
23			* \brief POSIX poll() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
29	adx	30	#include <sys/poll.h>
30			#include "fdlist.h"
31	michael	1021	#include "list.h"
32	michael	2627	#include "memory.h"
33	adx	30	#include "hook.h"
34			#include "ircd.h"
35			#include "s_bsd.h"
36	michael	1309	#include "log.h"
37	adx	30
38			/* I hate linux -- adrian */
39			#ifndef POLLRDNORM
40			#define POLLRDNORM POLLIN
41			#endif
42			#ifndef POLLWRNORM
43			#define POLLWRNORM POLLOUT
44			#endif
45
46			static struct pollfd *pollfds;
47			static int pollmax = -1; /* highest FD number */
48
49
50			/*
51			* init_netio
52			*
53			* This is a needed exported function which will be called to initialise
54			* the network loop code.
55			*/
56			void
57			init_netio(void)
58			{
59			int fd;
60
61			pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
62
63			for (fd = 0; fd < hard_fdlimit; fd++)
64			pollfds[fd].fd = -1;
65			}
66
67			/*
68			* find a spare slot in the fd list. We can optimise this out later!
69			* -- adrian
70			*/
71			static inline int
72			poll_findslot(void)
73			{
74			int i;
75
76			for (i = 0; i < hard_fdlimit; i++)
77			if (pollfds[i].fd == -1)
78			{
79			/* MATCH!!#$&$ /
80			return i;
81			}
82
83			assert(1 == 0);
84			/* NOTREACHED */
85			return -1;
86			}
87
88			/*
89			* comm_setselect
90			*
91			* This is a needed exported function which will be called to register
92			* and deregister interest in a pending IO state for a given FD.
93			*/
94			void
95			comm_setselect(fde_t F, unsigned int type, PF handler,
96			void *client_data, time_t timeout)
97	michael	2916	{
98	adx	30	int new_events;
99
100			if ((type & COMM_SELECT_READ))
101			{
102			F->read_handler = handler;
103			F->read_data = client_data;
104			}
105
106			if ((type & COMM_SELECT_WRITE))
107			{
108			F->write_handler = handler;
109			F->write_data = client_data;
110			}
111
112			new_events = (F->read_handler ? POLLRDNORM : 0) \|
113	michael	2650	(F->write_handler ? POLLWRNORM : 0);
114	adx	30
115			if (timeout != 0)
116	michael	2725	{
117	adx	30	F->timeout = CurrentTime + (timeout / 1000);
118	michael	2725	F->timeout_handler = handler;
119			F->timeout_data = client_data;
120			}
121	adx	30
122			if (new_events != F->evcache)
123			{
124			if (new_events == 0)
125			{
126			pollfds[F->comm_index].fd = -1;
127			pollfds[F->comm_index].revents = 0;
128
129			if (pollmax == F->comm_index)
130			while (pollmax >= 0 && pollfds[pollmax].fd == -1)
131	michael	2650	pollmax--;
132	adx	30	}
133			else
134			{
135			if (F->evcache == 0)
136			{
137			F->comm_index = poll_findslot();
138	michael	2650	if (F->comm_index > pollmax)
139			pollmax = F->comm_index;
140	adx	30
141	michael	2650	pollfds[F->comm_index].fd = F->fd;
142	adx	30	}
143	michael	2650
144	adx	30	pollfds[F->comm_index].events = new_events;
145			pollfds[F->comm_index].revents = 0;
146			}
147
148			F->evcache = new_events;
149			}
150			}
151	michael	2916
152	adx	30	/*
153			* comm_select
154			*
155			* Called to do the new-style IO, courtesy of of squid (like most of this
156			* new IO code). This routine handles the stuff we've hidden in
157			* comm_setselect and fd_table[] and calls callbacks for IO ready
158			* events.
159			*/
160			void
161			comm_select(void)
162			{
163			int num, ci, revents;
164			PF *hdl;
165			fde_t *F;
166
167			/* XXX kill that +1 later ! -- adrian */
168			num = poll(pollfds, pollmax + 1, SELECT_DELAY);
169
170			set_time();
171
172			if (num < 0)
173			{
174			#ifdef HAVE_USLEEP
175			usleep(50000); /* avoid 99% CPU in comm_select */
176			#endif
177			return;
178			}
179
180			for (ci = 0; ci <= pollmax && num > 0; ci++)
181			{
182			if ((revents = pollfds[ci].revents) == 0 \|\| pollfds[ci].fd == -1)
183			continue;
184			num--;
185
186			F = lookup_fd(pollfds[ci].fd);
187			if (F == NULL \|\| !F->flags.open)
188			continue;
189
190			if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
191	michael	2650	{
192	adx	30	if ((hdl = F->read_handler) != NULL)
193			{
194			F->read_handler = NULL;
195			hdl(F, F->read_data);
196	michael	2650	if (!F->flags.open)
197			continue;
198	adx	30	}
199	michael	2650	}
200	adx	30
201			if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
202	michael	2650	{
203	adx	30	if ((hdl = F->write_handler) != NULL)
204			{
205			F->write_handler = NULL;
206			hdl(F, F->write_data);
207	michael	2650	if (!F->flags.open)
208			continue;
209	adx	30	}
210	michael	2650	}
211	adx	30
212			comm_setselect(F, 0, NULL, NULL, 0);
213			}
214			}
215	stu	908	#endif