ircd-hybrid-8/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"
#include "fdlist.h"
#include "hook.h"
#include "ircd.h"
#include "s_bsd.h"
#include "s_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;
static dlink_node *hookptr;

/*
 * changing_fdlimit
 *
 * Make sure hard_fdlimit doesn't go too big.
 */
static void *
changing_fdlimit(va_list args)
{
  int fdmax = va_arg(args, int);

  if (fdmax > FD_SETSIZE)
    fdmax = FD_SETSIZE;

  return pass_callback(hookptr, fdmax);
}

/*
 * 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);

  hookptr = install_hook(fdlimit_cb, changing_fdlimit);
}

/*
 * 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);
    }
}
Revision:	34
Committed:	Sun Oct 2 21:05:51 2005 UTC (20 years, 9 months ago) by lusky
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_bsd_select.c*
File size:	4799 byte(s)
Log Message:	create 7.2 branch, we can move/rename it as needed.
#	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			#include "fdlist.h"
28			#include "hook.h"
29			#include "ircd.h"
30			#include "s_bsd.h"
31			#include "s_log.h"
32
33			/*
34			* Note that this is only a single list - multiple lists is kinda pointless
35			* under select because the list size is a function of the highest FD :-)
36			* -- adrian
37			*/
38
39			static fd_set select_readfds, tmpreadfds;
40			static fd_set select_writefds, tmpwritefds;
41			static int highest_fd = -1;
42			static dlink_node *hookptr;
43
44			/*
45			* changing_fdlimit
46			*
47			* Make sure hard_fdlimit doesn't go too big.
48			*/
49			static void *
50			changing_fdlimit(va_list args)
51			{
52			int fdmax = va_arg(args, int);
53
54			if (fdmax > FD_SETSIZE)
55			fdmax = FD_SETSIZE;
56
57			return pass_callback(hookptr, fdmax);
58			}
59
60			/*
61			* init_netio
62			*
63			* This is a needed exported function which will be called to initialise
64			* the network loop code.
65			*/
66			void
67			init_netio(void)
68			{
69			FD_ZERO(&select_readfds);
70			FD_ZERO(&select_writefds);
71
72			hookptr = install_hook(fdlimit_cb, changing_fdlimit);
73			}
74
75			/*
76			* comm_setselect
77			*
78			* This is a needed exported function which will be called to register
79			* and deregister interest in a pending IO state for a given FD.
80			*/
81			void
82			comm_setselect(fde_t F, unsigned int type, PF handler,
83			void *client_data, time_t timeout)
84			{
85			int new_events;
86
87			if ((type & COMM_SELECT_READ))
88			{
89			F->read_handler = handler;
90			F->read_data = client_data;
91			}
92
93			if ((type & COMM_SELECT_WRITE))
94			{
95			F->write_handler = handler;
96			F->write_data = client_data;
97			}
98
99			new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
100			(F->write_handler ? COMM_SELECT_WRITE : 0);
101
102			if (timeout != 0)
103			F->timeout = CurrentTime + (timeout / 1000);
104
105			if (new_events != F->evcache)
106			{
107			if ((new_events & COMM_SELECT_READ))
108			FD_SET(F->fd, &select_readfds);
109			else
110			{
111			FD_CLR(F->fd, &select_readfds);
112			FD_CLR(F->fd, &tmpreadfds);
113			}
114
115			if ((new_events & COMM_SELECT_WRITE))
116			FD_SET(F->fd, &select_writefds);
117			else
118			{
119			FD_CLR(F->fd, &select_writefds);
120			FD_CLR(F->fd, &tmpwritefds);
121			}
122
123			if (new_events == 0)
124			{
125			if (highest_fd == F->fd)
126			while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) \|\|
127			FD_ISSET(highest_fd, &select_writefds)))
128			highest_fd--;
129			}
130			else if (F->evcache == 0)
131			if (F->fd > highest_fd)
132			highest_fd = F->fd;
133
134			F->evcache = new_events;
135			}
136			}
137
138			/*
139			* comm_select
140			*
141			* Called to do the new-style IO, courtesy of squid (like most of this
142			* new IO code). This routine handles the stuff we've hidden in
143			* comm_setselect and fd_table[] and calls callbacks for IO ready
144			* events.
145			*/
146			void
147			comm_select(void)
148			{
149			struct timeval to;
150			int num, fd;
151			fde_t *F;
152			PF *hdl;
153
154			/* Copy over the read/write sets so we don't have to rebuild em */
155			memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
156			memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));
157
158			to.tv_sec = 0;
159			to.tv_usec = SELECT_DELAY * 1000;
160			num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
161
162			set_time();
163
164			if (num < 0)
165			{
166			#ifdef HAVE_USLEEP
167			usleep(50000);
168			#endif
169			return;
170			}
171
172			for (fd = 0; fd <= highest_fd && num > 0; fd++)
173			if (FD_ISSET(fd, &tmpreadfds) \|\| FD_ISSET(fd, &tmpwritefds))
174			{
175			num--;
176
177			F = lookup_fd(fd);
178			if (F == NULL \|\| !F->flags.open)
179			continue;
180
181			if (FD_ISSET(fd, &tmpreadfds))
182			if ((hdl = F->read_handler) != NULL)
183			{
184			F->read_handler = NULL;
185			hdl(F, F->read_data);
186			if (!F->flags.open)
187			continue;
188			}
189
190			if (FD_ISSET(fd, &tmpwritefds))
191			if ((hdl = F->write_handler) != NULL)
192			{
193			F->write_handler = NULL;
194			hdl(F, F->write_data);
195			if (!F->flags.open)
196			continue;
197			}
198
199			comm_setselect(F, 0, NULL, NULL, 0);
200			}
201			}