trunk/src/s_bsd_devpoll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2001-2020 ircd-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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file s_bsd_devpoll.c
 * \brief /dev/poll compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_DEVPOLL
#include <sys/ioctl.h>
/* HPUX uses devpoll.h and not sys/devpoll.h */
#ifdef HAVE_DEVPOLL_H
# include <devpoll.h>
#else
# ifdef HAVE_SYS_DEVPOLL_H
#  include <sys/devpoll.h>
# else
#  error "No devpoll.h found! Try ./configuring and letting the script choose for you."
# endif
#endif
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

static int devpoll_fd;

/*
 * comm_select_init
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
comm_select_init(void)
{
  if ((devpoll_fd = open("/dev/poll", O_RDWR)) < 0)
  {
    ilog(LOG_TYPE_IRCD, "comm_select_init: couldn't open /dev/poll: %s",
         strerror(errno));
    exit(EXIT_FAILURE); /* Whee! */
  }

  fd_open(devpoll_fd, false, "/dev/poll file descriptor");
}

/*
 * Write an update to the devpoll filter.
 * See, we end up having to do a seperate (?) remove before we do an
 * add of a new polltype, so we have to have this function seperate from
 * the others.
 */
static void
devpoll_write_update(int fd, int events)
{
  struct pollfd pfd;

  /* Build the pollfd entry */
  pfd.revents = 0;
  pfd.fd = fd;
  pfd.events = events;

  /* Write the thing to our poll fd */
  if (write(devpoll_fd, &pfd, sizeof(pfd)) != sizeof(pfd))
    ilog(LOG_TYPE_IRCD, "devpoll_write_update: dpfd write failed %d: %s",
         errno, strerror(errno));
}

/*
 * 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, void (*handler)(fde_t *, void *),
               void *client_data, uintmax_t timeout)
{
  int new_events;

  assert(F);
  assert(F->flags.open == true);

  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 ? POLLIN : 0) |
    (F->write_handler ? POLLOUT : 0);

  if (timeout)
  {
    F->timeout = event_base->time.sec_monotonic + timeout;
    F->timeout_handler = handler;
    F->timeout_data = client_data;
  }

  if (new_events != F->evcache)
  {
    devpoll_write_update(F->fd, POLLREMOVE);
    if ((F->evcache = new_events))
      devpoll_write_update(F->fd, 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;
  struct pollfd pollfds[128];
  struct dvpoll dopoll;
  void (*hdl)(fde_t *, void *);

  dopoll.dp_timeout = SELECT_DELAY;
  dopoll.dp_nfds = 128;
  dopoll.dp_fds = &pollfds[0];
  num = ioctl(devpoll_fd, DP_POLL, &dopoll);

  event_time_set();

  if (num < 0)
  {
    const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
    nanosleep(&req, NULL);  /* Avoid 99% CPU in comm_select */
    return;
  }

  for (int i = 0; i < num; ++i)
  {
    fde_t *F = &fd_table[dopoll.dp_fds[i].fd];

    if (F->flags.open == false)
      continue;

    if ((dopoll.dp_fds[i].revents & POLLIN))
    {
      if ((hdl = F->read_handler))
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);

        if (F->flags.open == false)
          continue;
      }
    }

    if ((dopoll.dp_fds[i].revents & POLLOUT))
    {
      if ((hdl = F->write_handler))
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);

        if (F->flags.open == false)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	9101
Committed:	Wed Jan 1 09:58:45 2020 UTC (5 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	4757 byte(s)
Log Message:	- Bump copyright years everywhere
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2001-2020 ircd-hybrid development team
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file s_bsd_devpoll.c
23	* \brief /dev/poll compatible network routines.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_DEVPOLL
29	#include <sys/ioctl.h>
30	/* HPUX uses devpoll.h and not sys/devpoll.h */
31	#ifdef HAVE_DEVPOLL_H
32	# include <devpoll.h>
33	#else
34	# ifdef HAVE_SYS_DEVPOLL_H
35	# include <sys/devpoll.h>
36	# else
37	# error "No devpoll.h found! Try ./configuring and letting the script choose for you."
38	# endif
39	#endif
40	#include "fdlist.h"
41	#include "ircd.h"
42	#include "s_bsd.h"
43	#include "log.h"
44
45	static int devpoll_fd;
46
47	/*
48	* comm_select_init
49	*
50	* This is a needed exported function which will be called to initialise
51	* the network loop code.
52	*/
53	void
54	comm_select_init(void)
55	{
56	if ((devpoll_fd = open("/dev/poll", O_RDWR)) < 0)
57	{
58	ilog(LOG_TYPE_IRCD, "comm_select_init: couldn't open /dev/poll: %s",
59	strerror(errno));
60	exit(EXIT_FAILURE); /* Whee! */
61	}
62
63	fd_open(devpoll_fd, false, "/dev/poll file descriptor");
64	}
65
66	/*
67	* Write an update to the devpoll filter.
68	* See, we end up having to do a seperate (?) remove before we do an
69	* add of a new polltype, so we have to have this function seperate from
70	* the others.
71	*/
72	static void
73	devpoll_write_update(int fd, int events)
74	{
75	struct pollfd pfd;
76
77	/* Build the pollfd entry */
78	pfd.revents = 0;
79	pfd.fd = fd;
80	pfd.events = events;
81
82	/* Write the thing to our poll fd */
83	if (write(devpoll_fd, &pfd, sizeof(pfd)) != sizeof(pfd))
84	ilog(LOG_TYPE_IRCD, "devpoll_write_update: dpfd write failed %d: %s",
85	errno, strerror(errno));
86	}
87
88	/*
89	* comm_setselect
90	*
91	* This is a needed exported function which will be called to register
92	* and deregister interest in a pending IO state for a given FD.
93	*/
94	void
95	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
96	void *client_data, uintmax_t timeout)
97	{
98	int new_events;
99
100	assert(F);
101	assert(F->flags.open == true);
102
103	if ((type & COMM_SELECT_READ))
104	{
105	F->read_handler = handler;
106	F->read_data = client_data;
107	}
108
109	if ((type & COMM_SELECT_WRITE))
110	{
111	F->write_handler = handler;
112	F->write_data = client_data;
113	}
114
115	new_events = (F->read_handler ? POLLIN : 0) \|
116	(F->write_handler ? POLLOUT : 0);
117
118	if (timeout)
119	{
120	F->timeout = event_base->time.sec_monotonic + timeout;
121	F->timeout_handler = handler;
122	F->timeout_data = client_data;
123	}
124
125	if (new_events != F->evcache)
126	{
127	devpoll_write_update(F->fd, POLLREMOVE);
128	if ((F->evcache = new_events))
129	devpoll_write_update(F->fd, new_events);
130	}
131	}
132
133	/*
134	* comm_select
135	*
136	* Called to do the new-style IO, courtesy of squid (like most of this
137	* new IO code). This routine handles the stuff we've hidden in
138	* comm_setselect and fd_table[] and calls callbacks for IO ready
139	* events.
140	*/
141	void
142	comm_select(void)
143	{
144	int num;
145	struct pollfd pollfds[128];
146	struct dvpoll dopoll;
147	void (hdl)(fde_t , void *);
148
149	dopoll.dp_timeout = SELECT_DELAY;
150	dopoll.dp_nfds = 128;
151	dopoll.dp_fds = &pollfds[0];
152	num = ioctl(devpoll_fd, DP_POLL, &dopoll);
153
154	event_time_set();
155
156	if (num < 0)
157	{
158	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
159	nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
160	return;
161	}
162
163	for (int i = 0; i < num; ++i)
164	{
165	fde_t *F = &fd_table[dopoll.dp_fds[i].fd];
166
167	if (F->flags.open == false)
168	continue;
169
170	if ((dopoll.dp_fds[i].revents & POLLIN))
171	{
172	if ((hdl = F->read_handler))
173	{
174	F->read_handler = NULL;
175	hdl(F, F->read_data);
176
177	if (F->flags.open == false)
178	continue;
179	}
180	}
181
182	if ((dopoll.dp_fds[i].revents & POLLOUT))
183	{
184	if ((hdl = F->write_handler))
185	{
186	F->write_handler = NULL;
187	hdl(F, F->write_data);
188
189	if (F->flags.open == false)
190	continue;
191	}
192	}
193
194	comm_setselect(F, 0, NULL, NULL, 0);
195	}
196	}
197	#endif