trunk/src/s_bsd_devpoll.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_bsd_devpoll.c: /dev/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_DEVPOLL
#include <sys/ioctl.h>
/* HPUX uses devpoll.h and not sys/devpoll.h */
#ifdef HAVE_DEVPOLL_H
# include <devpoll.h>
#else
# ifdef HAVE_SYS_DEVPOLL_H
#  include <sys/devpoll.h>
# else
#  error "No devpoll.h found! Try ./configuring and letting the script choose for you."
# endif
#endif
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "s_log.h"

static fde_t dpfd;

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

  if ((fd = open("/dev/poll", O_RDWR)) < 0)
  {
    ilog(L_CRIT, "init_netio: Couldn't open /dev/poll - %d: %s",
         errno, strerror(errno));
    exit(115); /* Whee! */
  }

  fd_open(&dpfd, fd, 0, "/dev/poll file descriptor");
}

/*
 * Write an update to the devpoll filter.
 * See, we end up having to do a seperate (?) remove before we do an
 * add of a new polltype, so we have to have this function seperate from
 * the others.
 */
static void
devpoll_write_update(int fd, int events)
{
  struct pollfd pfd;

  /* Build the pollfd entry */
  pfd.revents = 0;
  pfd.fd = fd;
  pfd.events = events;

  /* Write the thing to our poll fd */
  if (write(dpfd.fd, &pfd, sizeof(pfd)) != sizeof(pfd))
    ilog(L_NOTICE, "devpoll_write_update: dpfd write failed %d: %s",
         errno, strerror(errno));
}

/*
 * 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 ? POLLIN : 0) |
    (F->write_handler ? POLLOUT : 0);

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

  if (new_events != F->evcache)
  {
    devpoll_write_update(F->fd, POLLREMOVE);
    if ((F->evcache = new_events))
      devpoll_write_update(F->fd, new_events);
  }
}

/*
 * comm_select
 *
 * Called to do the new-style IO, courtesy 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, i;
  struct pollfd pollfds[128];
  struct dvpoll dopoll;
  PF *hdl;
  fde_t *F;

  dopoll.dp_timeout = SELECT_DELAY;
  dopoll.dp_nfds = 128;
  dopoll.dp_fds = &pollfds[0];
  num = ioctl(dpfd.fd, DP_POLL, &dopoll);

  set_time();

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

  for (i = 0; i < num; i++)
  {
    F = lookup_fd(dopoll.dp_fds[i].fd);
    if (F == NULL || !F->flags.open)
      continue;

    if ((dopoll.dp_fds[i].revents & POLLIN))
      if ((hdl = F->read_handler) != NULL)
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);
        if (!F->flags.open)
          continue;
      }

    if ((dopoll.dp_fds[i].revents & POLLOUT))
      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:	1155
Committed:	Tue Aug 9 20:27:45 2011 UTC (14 years ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/src/s_bsd_devpoll.c*
File size:	4475 byte(s)
Log Message:	- recreate "trunk"
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* s_bsd_devpoll.c: /dev/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_DEVPOLL
28	adx	30	#include <sys/ioctl.h>
29			/* HPUX uses devpoll.h and not sys/devpoll.h */
30			#ifdef HAVE_DEVPOLL_H
31			# include <devpoll.h>
32			#else
33			# ifdef HAVE_SYS_DEVPOLL_H
34			# include <sys/devpoll.h>
35			# else
36			# error "No devpoll.h found! Try ./configuring and letting the script choose for you."
37			# endif
38			#endif
39			#include "fdlist.h"
40			#include "ircd.h"
41			#include "s_bsd.h"
42			#include "s_log.h"
43
44			static fde_t dpfd;
45
46			/*
47			* init_netio
48			*
49			* This is a needed exported function which will be called to initialise
50			* the network loop code.
51			*/
52			void
53			init_netio(void)
54			{
55			int fd;
56
57			if ((fd = open("/dev/poll", O_RDWR)) < 0)
58			{
59			ilog(L_CRIT, "init_netio: Couldn't open /dev/poll - %d: %s",
60			errno, strerror(errno));
61			exit(115); /* Whee! */
62			}
63
64			fd_open(&dpfd, fd, 0, "/dev/poll file descriptor");
65			}
66
67			/*
68			* Write an update to the devpoll filter.
69			* See, we end up having to do a seperate (?) remove before we do an
70			* add of a new polltype, so we have to have this function seperate from
71			* the others.
72			*/
73			static void
74			devpoll_write_update(int fd, int events)
75			{
76			struct pollfd pfd;
77
78			/* Build the pollfd entry */
79			pfd.revents = 0;
80			pfd.fd = fd;
81			pfd.events = events;
82
83			/* Write the thing to our poll fd */
84			if (write(dpfd.fd, &pfd, sizeof(pfd)) != sizeof(pfd))
85			ilog(L_NOTICE, "devpoll_write_update: dpfd write failed %d: %s",
86			errno, strerror(errno));
87			}
88
89			/*
90			* comm_setselect
91			*
92			* This is a needed exported function which will be called to register
93			* and deregister interest in a pending IO state for a given FD.
94			*/
95			void
96			comm_setselect(fde_t F, unsigned int type, PF handler,
97			void *client_data, time_t timeout)
98			{
99			int new_events;
100
101			if ((type & COMM_SELECT_READ))
102			{
103			F->read_handler = handler;
104			F->read_data = client_data;
105			}
106
107			if ((type & COMM_SELECT_WRITE))
108			{
109			F->write_handler = handler;
110			F->write_data = client_data;
111			}
112
113	adx	282	new_events = (F->read_handler ? POLLIN : 0) \|
114			(F->write_handler ? POLLOUT : 0);
115	adx	30
116			if (timeout != 0)
117			F->timeout = CurrentTime + (timeout / 1000);
118
119			if (new_events != F->evcache)
120			{
121			devpoll_write_update(F->fd, POLLREMOVE);
122			if ((F->evcache = new_events))
123			devpoll_write_update(F->fd, new_events);
124			}
125			}
126
127			/*
128			* comm_select
129			*
130			* Called to do the new-style IO, courtesy of squid (like most of this
131			* new IO code). This routine handles the stuff we've hidden in
132			* comm_setselect and fd_table[] and calls callbacks for IO ready
133			* events.
134			*/
135			void
136			comm_select(void)
137			{
138			int num, i;
139			struct pollfd pollfds[128];
140			struct dvpoll dopoll;
141			PF *hdl;
142			fde_t *F;
143
144			dopoll.dp_timeout = SELECT_DELAY;
145			dopoll.dp_nfds = 128;
146			dopoll.dp_fds = &pollfds[0];
147			num = ioctl(dpfd.fd, DP_POLL, &dopoll);
148
149			set_time();
150
151			if (num < 0)
152			{
153			#ifdef HAVE_USLEEP
154			usleep(50000); /* avoid 99% CPU in comm_select */
155			#endif
156			return;
157			}
158
159			for (i = 0; i < num; i++)
160			{
161			F = lookup_fd(dopoll.dp_fds[i].fd);
162			if (F == NULL \|\| !F->flags.open)
163			continue;
164
165	adx	282	if ((dopoll.dp_fds[i].revents & POLLIN))
166	adx	30	if ((hdl = F->read_handler) != NULL)
167			{
168			F->read_handler = NULL;
169			hdl(F, F->read_data);
170	adx	242	if (!F->flags.open)
171			continue;
172	adx	30	}
173
174	adx	282	if ((dopoll.dp_fds[i].revents & POLLOUT))
175	adx	30	if ((hdl = F->write_handler) != NULL)
176			{
177			F->write_handler = NULL;
178			hdl(F, F->write_data);
179	adx	242	if (!F->flags.open)
180			continue;
181	adx	30	}
182
183			comm_setselect(F, 0, NULL, NULL, 0);
184			}
185			}
186	stu	908	#endif