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
 *
 *  $Id$
 */

#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);
  }
}
1	adx	30	/*
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	knight	31	* $Id$
24	adx	30	*/
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			}
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