trunk/src/s_bsd_epoll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2005-2018 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_epoll.c
 * \brief Linux epoll() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
#include "fdlist.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"
#include <sys/epoll.h>
#include <sys/syscall.h>

static int epoll_fd;


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

  fd_open(epoll_fd, 0, "epoll file descriptor");
}

/*
 * 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, op;
  struct epoll_event ep_event = { 0, { 0 } };

  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 ? EPOLLIN : 0) |
    (F->write_handler ? EPOLLOUT : 0);

  if (timeout != 0)
  {
    F->timeout = CurrentTime + (timeout / 1000);
    F->timeout_handler = handler;
    F->timeout_data = client_data;
  }

  if (new_events != F->evcache)
  {
    if (new_events == 0)
      op = EPOLL_CTL_DEL;
    else if (F->evcache == 0)
      op = EPOLL_CTL_ADD;
    else
      op = EPOLL_CTL_MOD;

    ep_event.events = F->evcache = new_events;
    ep_event.data.fd = F->fd;

    if (epoll_ctl(epoll_fd, op, F->fd, &ep_event) != 0)
    {
      ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
      abort();
    }
  }
}

/*
 * comm_select()
 *
 * Called to do the new-style IO, courtesy of 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 epoll_event ep_fdlist[128];
  int num, i;
  void (*hdl)(fde_t *, void *);

  num = epoll_wait(epoll_fd, ep_fdlist, 128, SELECT_DELAY);

  set_time();

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

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

    if (F->flags.open == 0)
      continue;

    if ((ep_fdlist[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR)))
    {
      if ((hdl = F->read_handler))
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);

        if (F->flags.open == 0)
          continue;
      }
    }

    if ((ep_fdlist[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR)))
    {
      if ((hdl = F->write_handler))
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);

        if (F->flags.open == 0)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	8339
Committed:	Sat Mar 3 22:47:06 2018 UTC (7 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	4105 byte(s)
Log Message:	- Restore fd_table. No longer allocate fde_t items from within any other structures like the AuthRequest, or Connection structure - struct AuthRequest once again is no longer allocated from within the Connection structure
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	8279	* Copyright (c) 2005-2018 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_epoll.c
23			* \brief Linux epoll() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
29	adx	30	#include "fdlist.h"
30			#include "ircd.h"
31			#include "s_bsd.h"
32	michael	1309	#include "log.h"
33	adx	30	#include <sys/epoll.h>
34			#include <sys/syscall.h>
35
36	michael	8339	static int epoll_fd;
37	adx	30
38
39			/*
40	michael	7566	* netio_init
41	adx	30	*
42			* This is a needed exported function which will be called to initialise
43			* the network loop code.
44			*/
45			void
46	michael	7566	netio_init(void)
47	adx	30	{
48	michael	8339	if ((epoll_fd = epoll_create(hard_fdlimit)) < 0)
49	adx	30	{
50	michael	7566	ilog(LOG_TYPE_IRCD, "netio_init: couldn't open epoll fd: %s",
51	michael	6560	strerror(errno));
52	michael	6553	exit(EXIT_FAILURE); /* Whee! */
53	adx	30	}
54
55	michael	8339	fd_open(epoll_fd, 0, "epoll file descriptor");
56	adx	30	}
57
58			/*
59			* comm_setselect
60			*
61			* This is a needed exported function which will be called to register
62			* and deregister interest in a pending IO state for a given FD.
63			*/
64			void
65	michael	4461	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
66	michael	7330	void *client_data, uintmax_t timeout)
67	adx	30	{
68			int new_events, op;
69	michael	966	struct epoll_event ep_event = { 0, { 0 } };
70	adx	30
71			if ((type & COMM_SELECT_READ))
72			{
73			F->read_handler = handler;
74			F->read_data = client_data;
75			}
76
77			if ((type & COMM_SELECT_WRITE))
78			{
79			F->write_handler = handler;
80			F->write_data = client_data;
81			}
82
83			new_events = (F->read_handler ? EPOLLIN : 0) \|
84			(F->write_handler ? EPOLLOUT : 0);
85
86			if (timeout != 0)
87	michael	2725	{
88	adx	30	F->timeout = CurrentTime + (timeout / 1000);
89	michael	2725	F->timeout_handler = handler;
90			F->timeout_data = client_data;
91			}
92	adx	30
93			if (new_events != F->evcache)
94			{
95			if (new_events == 0)
96			op = EPOLL_CTL_DEL;
97			else if (F->evcache == 0)
98			op = EPOLL_CTL_ADD;
99			else
100			op = EPOLL_CTL_MOD;
101
102			ep_event.events = F->evcache = new_events;
103			ep_event.data.fd = F->fd;
104
105	michael	8339	if (epoll_ctl(epoll_fd, op, F->fd, &ep_event) != 0)
106	adx	30	{
107	michael	1247	ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
108	adx	30	abort();
109			}
110			}
111			}
112
113			/*
114			* comm_select()
115			*
116			* Called to do the new-style IO, courtesy of of squid (like most of this
117			* new IO code). This routine handles the stuff we've hidden in
118			* comm_setselect and fd_table[] and calls callbacks for IO ready
119			* events.
120			*/
121			void
122			comm_select(void)
123			{
124			struct epoll_event ep_fdlist[128];
125			int num, i;
126	michael	4461	void (hdl)(fde_t , void *);
127	adx	30
128	michael	8339	num = epoll_wait(epoll_fd, ep_fdlist, 128, SELECT_DELAY);
129	adx	30
130			set_time();
131
132			if (num < 0)
133			{
134	michael	6542	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
135			nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
136	adx	30	return;
137			}
138
139			for (i = 0; i < num; i++)
140			{
141	michael	8339	fde_t *F = &fd_table[ep_fdlist[i].data.fd];
142
143			if (F->flags.open == 0)
144	adx	30	continue;
145
146			if ((ep_fdlist[i].events & (EPOLLIN \| EPOLLHUP \| EPOLLERR)))
147	michael	2650	{
148	michael	5902	if ((hdl = F->read_handler))
149	adx	30	{
150			F->read_handler = NULL;
151			hdl(F, F->read_data);
152	michael	8339
153			if (F->flags.open == 0)
154	michael	2650	continue;
155	adx	30	}
156	michael	2650	}
157	adx	30
158			if ((ep_fdlist[i].events & (EPOLLOUT \| EPOLLHUP \| EPOLLERR)))
159	michael	2650	{
160	michael	5902	if ((hdl = F->write_handler))
161	adx	30	{
162			F->write_handler = NULL;
163			hdl(F, F->write_data);
164	michael	8339
165			if (F->flags.open == 0)
166	michael	2650	continue;
167	adx	30	}
168	michael	2650	}
169	adx	30
170			comm_setselect(F, 0, NULL, NULL, 0);
171			}
172			}
173	stu	908	#endif