ircd-hybrid-7.2/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 "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);
    }
}
#endif
Revision:	908
Committed:	Sun Nov 4 23:21:51 2007 UTC (17 years, 9 months ago) by stu
Content type:	text/x-csrc
File size:	4860 byte(s)
Log Message:	Completely redo the build system. Now uses libtool and automake. Suggest you clean out your tree and then do ./autogen.sh.
#	Content
1	/*
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	* $Id$
24	*/
25
26	#include "stdinc.h"
27	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_SELECT
28	#include "fdlist.h"
29	#include "hook.h"
30	#include "ircd.h"
31	#include "s_bsd.h"
32	#include "s_log.h"
33
34	/*
35	* Note that this is only a single list - multiple lists is kinda pointless
36	* under select because the list size is a function of the highest FD :-)
37	* -- adrian
38	*/
39
40	static fd_set select_readfds, tmpreadfds;
41	static fd_set select_writefds, tmpwritefds;
42	static int highest_fd = -1;
43	static dlink_node *hookptr;
44
45	/*
46	* changing_fdlimit
47	*
48	* Make sure hard_fdlimit doesn't go too big.
49	*/
50	static void *
51	changing_fdlimit(va_list args)
52	{
53	int fdmax = va_arg(args, int);
54
55	if (fdmax > FD_SETSIZE)
56	fdmax = FD_SETSIZE;
57
58	return pass_callback(hookptr, fdmax);
59	}
60
61	/*
62	* init_netio
63	*
64	* This is a needed exported function which will be called to initialise
65	* the network loop code.
66	*/
67	void
68	init_netio(void)
69	{
70	FD_ZERO(&select_readfds);
71	FD_ZERO(&select_writefds);
72
73	hookptr = install_hook(fdlimit_cb, changing_fdlimit);
74	}
75
76	/*
77	* comm_setselect
78	*
79	* This is a needed exported function which will be called to register
80	* and deregister interest in a pending IO state for a given FD.
81	*/
82	void
83	comm_setselect(fde_t F, unsigned int type, PF handler,
84	void *client_data, time_t timeout)
85	{
86	int new_events;
87
88	if ((type & COMM_SELECT_READ))
89	{
90	F->read_handler = handler;
91	F->read_data = client_data;
92	}
93
94	if ((type & COMM_SELECT_WRITE))
95	{
96	F->write_handler = handler;
97	F->write_data = client_data;
98	}
99
100	new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
101	(F->write_handler ? COMM_SELECT_WRITE : 0);
102
103	if (timeout != 0)
104	F->timeout = CurrentTime + (timeout / 1000);
105
106	if (new_events != F->evcache)
107	{
108	if ((new_events & COMM_SELECT_READ))
109	FD_SET(F->fd, &select_readfds);
110	else
111	{
112	FD_CLR(F->fd, &select_readfds);
113	FD_CLR(F->fd, &tmpreadfds);
114	}
115
116	if ((new_events & COMM_SELECT_WRITE))
117	FD_SET(F->fd, &select_writefds);
118	else
119	{
120	FD_CLR(F->fd, &select_writefds);
121	FD_CLR(F->fd, &tmpwritefds);
122	}
123
124	if (new_events == 0)
125	{
126	if (highest_fd == F->fd)
127	while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) \|\|
128	FD_ISSET(highest_fd, &select_writefds)))
129	highest_fd--;
130	}
131	else if (F->evcache == 0)
132	if (F->fd > highest_fd)
133	highest_fd = F->fd;
134
135	F->evcache = new_events;
136	}
137	}
138
139	/*
140	* comm_select
141	*
142	* Called to do the new-style IO, courtesy of squid (like most of this
143	* new IO code). This routine handles the stuff we've hidden in
144	* comm_setselect and fd_table[] and calls callbacks for IO ready
145	* events.
146	*/
147	void
148	comm_select(void)
149	{
150	struct timeval to;
151	int num, fd;
152	fde_t *F;
153	PF *hdl;
154
155	/* Copy over the read/write sets so we don't have to rebuild em */
156	memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
157	memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));
158
159	to.tv_sec = 0;
160	to.tv_usec = SELECT_DELAY * 1000;
161	num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
162
163	set_time();
164
165	if (num < 0)
166	{
167	#ifdef HAVE_USLEEP
168	usleep(50000);
169	#endif
170	return;
171	}
172
173	for (fd = 0; fd <= highest_fd && num > 0; fd++)
174	if (FD_ISSET(fd, &tmpreadfds) \|\| FD_ISSET(fd, &tmpwritefds))
175	{
176	num--;
177
178	F = lookup_fd(fd);
179	if (F == NULL \|\| !F->flags.open)
180	continue;
181
182	if (FD_ISSET(fd, &tmpreadfds))
183	if ((hdl = F->read_handler) != NULL)
184	{
185	F->read_handler = NULL;
186	hdl(F, F->read_data);
187	if (!F->flags.open)
188	continue;
189	}
190
191	if (FD_ISSET(fd, &tmpwritefds))
192	if ((hdl = F->write_handler) != NULL)
193	{
194	F->write_handler = NULL;
195	hdl(F, F->write_data);
196	if (!F->flags.open)
197	continue;
198	}
199
200	comm_setselect(F, 0, NULL, NULL, 0);
201	}
202	}
203	#endif