trunk/src/s_bsd_select.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_bsd_select.c: select() 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_SELECT
#include "list.h"
#include "fdlist.h"
#include "hook.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

/*
 * Note that this is only a single list - multiple lists is kinda pointless
 * under select because the list size is a function of the highest FD :-)
 *   -- adrian
 */

static fd_set select_readfds, tmpreadfds;
static fd_set select_writefds, tmpwritefds;
static int highest_fd = -1;


/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(void)
{
  FD_ZERO(&select_readfds);
  FD_ZERO(&select_writefds);
}

/*
 * 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 ? COMM_SELECT_READ : 0) |
               (F->write_handler ? COMM_SELECT_WRITE : 0);

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

  if (new_events != F->evcache)
  {
    if ((new_events & COMM_SELECT_READ))
      FD_SET(F->fd, &select_readfds);
    else
    {
      FD_CLR(F->fd, &select_readfds);
      FD_CLR(F->fd, &tmpreadfds);
    }

    if ((new_events & COMM_SELECT_WRITE))
      FD_SET(F->fd, &select_writefds);
    else
    {
      FD_CLR(F->fd, &select_writefds);
      FD_CLR(F->fd, &tmpwritefds);
    }

    if (new_events == 0)
    {
      if (highest_fd == F->fd)
        while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) ||
                                   FD_ISSET(highest_fd, &select_writefds)))
          highest_fd--;
    }
    else if (F->evcache == 0)
      if (F->fd > highest_fd)
        highest_fd = F->fd;

    F->evcache = 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)
{
  struct timeval to;
  int num, fd;
  fde_t *F;
  PF *hdl;

  /* Copy over the read/write sets so we don't have to rebuild em */
  memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
  memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));

  to.tv_sec = 0;
  to.tv_usec = SELECT_DELAY * 1000;
  num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);

  set_time();

  if (num < 0)
  {
#ifdef HAVE_USLEEP
    usleep(50000);
#endif
    return;
  }

  for (fd = 0; fd <= highest_fd && num > 0; fd++)
  {
    if (FD_ISSET(fd, &tmpreadfds) || FD_ISSET(fd, &tmpwritefds))
    {
      num--;

      F = lookup_fd(fd);
      if (F == NULL || !F->flags.open)
        continue;

      if (FD_ISSET(fd, &tmpreadfds))
      {
        if ((hdl = F->read_handler) != NULL)
        {
          F->read_handler = NULL;
          hdl(F, F->read_data);
          if (!F->flags.open)
            continue;
        }
      }

      if (FD_ISSET(fd, &tmpwritefds))
      {
        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:	4599 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_select.c: select() 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_SELECT
28	michael	1021	#include "list.h"
29	adx	30	#include "fdlist.h"
30			#include "hook.h"
31			#include "ircd.h"
32			#include "s_bsd.h"
33	michael	1309	#include "log.h"
34	adx	30
35			/*
36			* Note that this is only a single list - multiple lists is kinda pointless
37			* under select because the list size is a function of the highest FD :-)
38			* -- adrian
39			*/
40
41			static fd_set select_readfds, tmpreadfds;
42			static fd_set select_writefds, tmpwritefds;
43			static int highest_fd = -1;
44
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			FD_ZERO(&select_readfds);
56			FD_ZERO(&select_writefds);
57			}
58
59			/*
60			* comm_setselect
61			*
62			* This is a needed exported function which will be called to register
63			* and deregister interest in a pending IO state for a given FD.
64			*/
65			void
66			comm_setselect(fde_t F, unsigned int type, PF handler,
67			void *client_data, time_t timeout)
68			{
69			int new_events;
70
71			if ((type & COMM_SELECT_READ))
72			{
73			F->read_handler = handler;
74			F->read_data = client_data;
75			}
76
77			if ((type & COMM_SELECT_WRITE))
78			{
79			F->write_handler = handler;
80			F->write_data = client_data;
81			}
82
83			new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
84	michael	2650	(F->write_handler ? COMM_SELECT_WRITE : 0);
85	adx	30
86			if (timeout != 0)
87			F->timeout = CurrentTime + (timeout / 1000);
88
89			if (new_events != F->evcache)
90			{
91			if ((new_events & COMM_SELECT_READ))
92			FD_SET(F->fd, &select_readfds);
93			else
94			{
95			FD_CLR(F->fd, &select_readfds);
96			FD_CLR(F->fd, &tmpreadfds);
97			}
98
99			if ((new_events & COMM_SELECT_WRITE))
100			FD_SET(F->fd, &select_writefds);
101			else
102			{
103			FD_CLR(F->fd, &select_writefds);
104			FD_CLR(F->fd, &tmpwritefds);
105			}
106
107			if (new_events == 0)
108			{
109			if (highest_fd == F->fd)
110			while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) \|\|
111	michael	2650	FD_ISSET(highest_fd, &select_writefds)))
112	adx	30	highest_fd--;
113			}
114			else if (F->evcache == 0)
115			if (F->fd > highest_fd)
116			highest_fd = F->fd;
117
118			F->evcache = new_events;
119			}
120			}
121
122			/*
123			* comm_select
124			*
125			* Called to do the new-style IO, courtesy of squid (like most of this
126			* new IO code). This routine handles the stuff we've hidden in
127			* comm_setselect and fd_table[] and calls callbacks for IO ready
128			* events.
129			*/
130			void
131			comm_select(void)
132			{
133			struct timeval to;
134			int num, fd;
135			fde_t *F;
136			PF *hdl;
137
138			/* Copy over the read/write sets so we don't have to rebuild em */
139			memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
140			memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));
141
142			to.tv_sec = 0;
143			to.tv_usec = SELECT_DELAY * 1000;
144			num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
145
146			set_time();
147
148			if (num < 0)
149			{
150			#ifdef HAVE_USLEEP
151			usleep(50000);
152			#endif
153			return;
154			}
155
156			for (fd = 0; fd <= highest_fd && num > 0; fd++)
157	michael	2650	{
158	adx	30	if (FD_ISSET(fd, &tmpreadfds) \|\| FD_ISSET(fd, &tmpwritefds))
159			{
160			num--;
161
162			F = lookup_fd(fd);
163			if (F == NULL \|\| !F->flags.open)
164			continue;
165
166			if (FD_ISSET(fd, &tmpreadfds))
167	michael	2650	{
168	adx	30	if ((hdl = F->read_handler) != NULL)
169			{
170			F->read_handler = NULL;
171			hdl(F, F->read_data);
172			if (!F->flags.open)
173			continue;
174			}
175	michael	2650	}
176	adx	30
177			if (FD_ISSET(fd, &tmpwritefds))
178	michael	2650	{
179	adx	30	if ((hdl = F->write_handler) != NULL)
180			{
181			F->write_handler = NULL;
182			hdl(F, F->write_data);
183			if (!F->flags.open)
184			continue;
185			}
186	michael	2650	}
187	adx	30
188			comm_setselect(F, 0, NULL, NULL, 0);
189			}
190	michael	2650	}
191	adx	30	}
192	stu	908	#endif