trunk/src/s_bsd_devpoll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2001-2019 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 / 1000);
    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:	8900
Committed:	Sun Apr 21 20:09:18 2019 UTC (6 years, 4 months ago) by michael
Content type:	text/x-csrc
File size:	4766 byte(s)
Log Message:	- Add support for monotonic clocks and have some timers make use of it; remove event_set_back_events()
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	8752	* Copyright (c) 2001-2019 ircd-hybrid development team
5	adx	30	*
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	michael	4565	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	adx	30	* USA
20			*/
21
22	michael	2916	/*! \file s_bsd_devpoll.c
23			* \brief /dev/poll compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_DEVPOLL
29	adx	30	#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	michael	1309	#include "log.h"
44	adx	30
45	michael	8339	static int devpoll_fd;
46	adx	30
47			/*
48	michael	8414	* comm_select_init
49	adx	30	*
50			* This is a needed exported function which will be called to initialise
51			* the network loop code.
52			*/
53			void
54	michael	8414	comm_select_init(void)
55	adx	30	{
56	michael	8339	if ((devpoll_fd = open("/dev/poll", O_RDWR)) < 0)
57	adx	30	{
58	michael	8414	ilog(LOG_TYPE_IRCD, "comm_select_init: couldn't open /dev/poll: %s",
59	michael	6560	strerror(errno));
60	michael	6553	exit(EXIT_FAILURE); /* Whee! */
61	adx	30	}
62
63	michael	8658	fd_open(devpoll_fd, false, "/dev/poll file descriptor");
64	adx	30	}
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	michael	8339	if (write(devpoll_fd, &pfd, sizeof(pfd)) != sizeof(pfd))
84	michael	1247	ilog(LOG_TYPE_IRCD, "devpoll_write_update: dpfd write failed %d: %s",
85	adx	30	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	michael	4461	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
96	michael	7330	void *client_data, uintmax_t timeout)
97	adx	30	{
98			int new_events;
99
100	michael	8717	assert(F);
101			assert(F->flags.open == true);
102
103	adx	30	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	adx	282	new_events = (F->read_handler ? POLLIN : 0) \|
116			(F->write_handler ? POLLOUT : 0);
117	adx	30
118	michael	8431	if (timeout)
119	michael	2725	{
120	michael	8900	F->timeout = event_base->time.sec_monotonic + (timeout / 1000);
121	michael	2725	F->timeout_handler = handler;
122			F->timeout_data = client_data;
123			}
124	adx	30
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	michael	8431	int num;
145	adx	30	struct pollfd pollfds[128];
146			struct dvpoll dopoll;
147	michael	4461	void (hdl)(fde_t , void *);
148	adx	30
149			dopoll.dp_timeout = SELECT_DELAY;
150			dopoll.dp_nfds = 128;
151			dopoll.dp_fds = &pollfds[0];
152	michael	8339	num = ioctl(devpoll_fd, DP_POLL, &dopoll);
153	adx	30
154	michael	8900	event_time_set();
155	adx	30
156			if (num < 0)
157			{
158	michael	6542	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
159			nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
160	adx	30	return;
161			}
162
163	michael	8431	for (int i = 0; i < num; ++i)
164	adx	30	{
165	michael	8339	fde_t *F = &fd_table[dopoll.dp_fds[i].fd];
166
167	michael	8658	if (F->flags.open == false)
168	adx	30	continue;
169
170	adx	282	if ((dopoll.dp_fds[i].revents & POLLIN))
171	michael	2650	{
172	michael	8431	if ((hdl = F->read_handler))
173	adx	30	{
174			F->read_handler = NULL;
175			hdl(F, F->read_data);
176	michael	8339
177	michael	8658	if (F->flags.open == false)
178	adx	242	continue;
179	adx	30	}
180	michael	2650	}
181	adx	30
182	adx	282	if ((dopoll.dp_fds[i].revents & POLLOUT))
183	michael	2650	{
184	michael	8431	if ((hdl = F->write_handler))
185	adx	30	{
186			F->write_handler = NULL;
187			hdl(F, F->write_data);
188	michael	8339
189	michael	8658	if (F->flags.open == false)
190	adx	242	continue;
191	adx	30	}
192	michael	2650	}
193	adx	30
194			comm_setselect(F, 0, NULL, NULL, 0);
195			}
196			}
197	stu	908	#endif