libio/comm/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: s_bsd_select.c 33 2005-10-02 20:50:00Z knight $
 */

#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:	59
Committed:	Mon Oct 3 15:11:57 2005 UTC (18 years, 6 months ago) by adx
Content type:	text/x-csrc
File size:	4847 byte(s)
Log Message:	- move non-irc related sources to /libio - todo: make it independent of the rest of code
#	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: s_bsd_select.c 33 2005-10-02 20:50:00Z knight $
24	*/
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	}