ircd-hybrid/src/s_bsd_kqueue.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_bsd_kqueue.c: FreeBSD kqueue compatible network routines.
 *
 *  Originally by Adrian Chadd <adrian@creative.net.au>
 *  Copyright (C) 2005 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_kqueue.c,v 1.45 2005/09/29 06:35:41 metalrock Exp $
 */

#include "stdinc.h"
#include <sys/event.h>
#include "fdlist.h"
#include "ircd.h"
#include "memory.h"
#include "s_bsd.h"
#include "s_log.h"

#define KE_LENGTH 128

/* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */

#ifndef EV_SET
#define EV_SET(kevp, a, b, c, d, e, f) do {     \
        (kevp)->ident = (a);                    \
        (kevp)->filter = (b);                   \
        (kevp)->flags = (c);                    \
        (kevp)->fflags = (d);                   \
        (kevp)->data = (e);                     \
        (kevp)->udata = (f);                    \
} while(0)
#endif

static fde_t kqfd;
static struct kevent kq_fdlist[KE_LENGTH];  /* kevent buffer */
static int kqoff;      /* offset into the buffer */
void init_netio(void);

/*
 * 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 = kqueue()) < 0)
  {
    ilog(L_CRIT, "init_netio: Couldn't open kqueue fd!");
    exit(115); /* Whee! */
  }

  fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
}

/*
 * Write a single update to the kqueue list.
 */
static void
kq_update_events(int fd, int filter, int what)
{
  static struct timespec zero_timespec = {0, 0};
  struct kevent *kep = kq_fdlist + kqoff;

  EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);

  if (kqoff == KE_LENGTH)
  {
    kevent(kqfd.fd, kq_fdlist, kqoff, NULL, 0, &zero_timespec);
    kqoff = 0;
  }
  else
    kqoff++;
}

/*
 * 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, diff;

  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);

  diff = new_events ^ F->evcache;

  if ((diff & COMM_SELECT_READ))
    kq_update_events(F->fd, EVFILT_READ,
      (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
  if ((diff & COMM_SELECT_WRITE))
    kq_update_events(F->fd, EVFILT_WRITE,
      (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);

  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)
{
  int num, i;
  static struct kevent ke[KE_LENGTH];
  struct timespec poll_time;
  PF *hdl;
  fde_t *F;

  /*
   * remember we are doing NANOseconds here, not micro/milli. God knows
   * why jlemon used a timespec, but hey, he wrote the interface, not I
   *   -- Adrian
   */
  poll_time.tv_sec = 0;
  poll_time.tv_nsec = SELECT_DELAY * 1000000;
  num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
  kqoff = 0;

  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(ke[i].ident);
    if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
      continue;

    if (ke[i].filter == EVFILT_READ)
      if ((hdl = F->read_handler) != NULL)
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);
        if (!F->flags.open)
          continue;
      }

    if (ke[i].filter == EVFILT_WRITE)
      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:	30
Committed:	Sun Oct 2 20:03:27 2005 UTC (20 years, 9 months ago) by adx
Content type:	text/x-csrc
File size:	4989 byte(s)
Log Message:	- imported sources - can be moved later according to the directory/branching scheme, but we need the svn up
#	Content
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* s_bsd_kqueue.c: FreeBSD kqueue compatible network routines.
4	*
5	* Originally by Adrian Chadd <adrian@creative.net.au>
6	* Copyright (C) 2005 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_kqueue.c,v 1.45 2005/09/29 06:35:41 metalrock Exp $
24	*/
25
26	#include "stdinc.h"
27	#include <sys/event.h>
28	#include "fdlist.h"
29	#include "ircd.h"
30	#include "memory.h"
31	#include "s_bsd.h"
32	#include "s_log.h"
33
34	#define KE_LENGTH 128
35
36	/* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
37
38	#ifndef EV_SET
39	#define EV_SET(kevp, a, b, c, d, e, f) do { \
40	(kevp)->ident = (a); \
41	(kevp)->filter = (b); \
42	(kevp)->flags = (c); \
43	(kevp)->fflags = (d); \
44	(kevp)->data = (e); \
45	(kevp)->udata = (f); \
46	} while(0)
47	#endif
48
49	static fde_t kqfd;
50	static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
51	static int kqoff; /* offset into the buffer */
52	void init_netio(void);
53
54	/*
55	* init_netio
56	*
57	* This is a needed exported function which will be called to initialise
58	* the network loop code.
59	*/
60	void
61	init_netio(void)
62	{
63	int fd;
64
65	if ((fd = kqueue()) < 0)
66	{
67	ilog(L_CRIT, "init_netio: Couldn't open kqueue fd!");
68	exit(115); /* Whee! */
69	}
70
71	fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
72	}
73
74	/*
75	* Write a single update to the kqueue list.
76	*/
77	static void
78	kq_update_events(int fd, int filter, int what)
79	{
80	static struct timespec zero_timespec = {0, 0};
81	struct kevent *kep = kq_fdlist + kqoff;
82
83	EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
84
85	if (kqoff == KE_LENGTH)
86	{
87	kevent(kqfd.fd, kq_fdlist, kqoff, NULL, 0, &zero_timespec);
88	kqoff = 0;
89	}
90	else
91	kqoff++;
92	}
93
94	/*
95	* comm_setselect
96	*
97	* This is a needed exported function which will be called to register
98	* and deregister interest in a pending IO state for a given FD.
99	*/
100	void
101	comm_setselect(fde_t F, unsigned int type, PF handler,
102	void *client_data, time_t timeout)
103	{
104	int new_events, diff;
105
106	if ((type & COMM_SELECT_READ))
107	{
108	F->read_handler = handler;
109	F->read_data = client_data;
110	}
111
112	if ((type & COMM_SELECT_WRITE))
113	{
114	F->write_handler = handler;
115	F->write_data = client_data;
116	}
117
118	new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
119	(F->write_handler ? COMM_SELECT_WRITE : 0);
120
121	if (timeout != 0)
122	F->timeout = CurrentTime + (timeout / 1000);
123
124	diff = new_events ^ F->evcache;
125
126	if ((diff & COMM_SELECT_READ))
127	kq_update_events(F->fd, EVFILT_READ,
128	(new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
129	if ((diff & COMM_SELECT_WRITE))
130	kq_update_events(F->fd, EVFILT_WRITE,
131	(new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
132
133	F->evcache = new_events;
134	}
135
136	/*
137	* comm_select
138	*
139	* Called to do the new-style IO, courtesy of squid (like most of this
140	* new IO code). This routine handles the stuff we've hidden in
141	* comm_setselect and fd_table[] and calls callbacks for IO ready
142	* events.
143	*/
144	void
145	comm_select(void)
146	{
147	int num, i;
148	static struct kevent ke[KE_LENGTH];
149	struct timespec poll_time;
150	PF *hdl;
151	fde_t *F;
152
153	/*
154	* remember we are doing NANOseconds here, not micro/milli. God knows
155	* why jlemon used a timespec, but hey, he wrote the interface, not I
156	* -- Adrian
157	*/
158	poll_time.tv_sec = 0;
159	poll_time.tv_nsec = SELECT_DELAY * 1000000;
160	num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
161	kqoff = 0;
162
163	set_time();
164
165	if (num < 0)
166	{
167	#ifdef HAVE_USLEEP
168	usleep(50000); /* avoid 99% CPU in comm_select */
169	#endif
170	return;
171	}
172
173	for (i = 0; i < num; i++)
174	{
175	F = lookup_fd(ke[i].ident);
176	if (F == NULL \|\| !F->flags.open \|\| (ke[i].flags & EV_ERROR))
177	continue;
178
179	if (ke[i].filter == EVFILT_READ)
180	if ((hdl = F->read_handler) != NULL)
181	{
182	F->read_handler = NULL;
183	hdl(F, F->read_data);
184	if (!F->flags.open)
185	continue;
186	}
187
188	if (ke[i].filter == EVFILT_WRITE)
189	if ((hdl = F->write_handler) != NULL)
190	{
191	F->write_handler = NULL;
192	hdl(F, F->write_data);
193	if (!F->flags.open)
194	continue;
195	}
196
197	comm_setselect(F, 0, NULL, NULL, 0);
198	}
199	}