trunk/src/s_bsd_poll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2020 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_poll.c
 * \brief POSIX poll() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
#include <sys/poll.h>
#include "fdlist.h"
#include "list.h"
#include "memory.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

/* I hate linux -- adrian */
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif

static int pollfds_size;
static struct pollfd *pollfds;
static int pollnum;


/*
 * comm_select_init
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
comm_select_init(void)
{
  pollfds_size = hard_fdlimit;
  pollfds = xcalloc(sizeof(struct pollfd) * pollfds_size);
}

/*
 * 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 ? POLLRDNORM : 0) |
               (F->write_handler ? POLLWRNORM : 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)
  {
    if (new_events == 0)
    {
      if (F->comm_index != pollnum - 1)
      {
        fde_t *other = &fd_table[pollfds[pollnum - 1].fd];

        pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
        pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
        pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;

        assert(other);
        other->comm_index = F->comm_index;
      }

      F->comm_index = -1;
      --pollnum;
    }
    else
    {
      if (F->evcache == 0)
      {
        if (pollnum >= pollfds_size)
        {
          pollfds_size *= 2;
          pollfds = xrealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
        }

        F->comm_index = pollnum++;
        pollfds[F->comm_index].fd = F->fd;
      }

      pollfds[F->comm_index].events = new_events;
      pollfds[F->comm_index].revents = 0;
    }

    F->evcache = new_events;
  }
}

/*
 * 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)
{
  int num;
  void (*hdl)(fde_t *, void *);

  num = poll(pollfds, pollnum, SELECT_DELAY);

  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 ci = 0; ci < pollnum && num > 0; ++ci)
  {
    int revents = pollfds[ci].revents;
    if (revents == 0)
      continue;

    --num;

    fde_t *F = &fd_table[pollfds[ci].fd];

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

    if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
    {
      if ((hdl = F->read_handler))
      {
        F->read_handler = NULL;
        hdl(F, F->read_data);

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

    if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
    {
      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:	4750 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) 2000-2020 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_poll.c
23	* \brief POSIX poll() compatible network routines.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
29	#include <sys/poll.h>
30	#include "fdlist.h"
31	#include "list.h"
32	#include "memory.h"
33	#include "ircd.h"
34	#include "s_bsd.h"
35	#include "log.h"
36
37	/* I hate linux -- adrian */
38	#ifndef POLLRDNORM
39	#define POLLRDNORM POLLIN
40	#endif
41	#ifndef POLLWRNORM
42	#define POLLWRNORM POLLOUT
43	#endif
44
45	static int pollfds_size;
46	static struct pollfd *pollfds;
47	static int pollnum;
48
49
50	/*
51	* comm_select_init
52	*
53	* This is a needed exported function which will be called to initialise
54	* the network loop code.
55	*/
56	void
57	comm_select_init(void)
58	{
59	pollfds_size = hard_fdlimit;
60	pollfds = xcalloc(sizeof(struct pollfd) * pollfds_size);
61	}
62
63	/*
64	* comm_setselect
65	*
66	* This is a needed exported function which will be called to register
67	* and deregister interest in a pending IO state for a given FD.
68	*/
69	void
70	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
71	void *client_data, uintmax_t timeout)
72	{
73	int new_events;
74
75	assert(F);
76	assert(F->flags.open == true);
77
78	if ((type & COMM_SELECT_READ))
79	{
80	F->read_handler = handler;
81	F->read_data = client_data;
82	}
83
84	if ((type & COMM_SELECT_WRITE))
85	{
86	F->write_handler = handler;
87	F->write_data = client_data;
88	}
89
90	new_events = (F->read_handler ? POLLRDNORM : 0) \|
91	(F->write_handler ? POLLWRNORM : 0);
92
93	if (timeout)
94	{
95	F->timeout = event_base->time.sec_monotonic + timeout;
96	F->timeout_handler = handler;
97	F->timeout_data = client_data;
98	}
99
100	if (new_events != F->evcache)
101	{
102	if (new_events == 0)
103	{
104	if (F->comm_index != pollnum - 1)
105	{
106	fde_t *other = &fd_table[pollfds[pollnum - 1].fd];
107
108	pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
109	pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
110	pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;
111
112	assert(other);
113	other->comm_index = F->comm_index;
114	}
115
116	F->comm_index = -1;
117	--pollnum;
118	}
119	else
120	{
121	if (F->evcache == 0)
122	{
123	if (pollnum >= pollfds_size)
124	{
125	pollfds_size *= 2;
126	pollfds = xrealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
127	}
128
129	F->comm_index = pollnum++;
130	pollfds[F->comm_index].fd = F->fd;
131	}
132
133	pollfds[F->comm_index].events = new_events;
134	pollfds[F->comm_index].revents = 0;
135	}
136
137	F->evcache = new_events;
138	}
139	}
140
141	/*
142	* comm_select
143	*
144	* Called to do the new-style IO, courtesy of of squid (like most of this
145	* new IO code). This routine handles the stuff we've hidden in
146	* comm_setselect and fd_table[] and calls callbacks for IO ready
147	* events.
148	*/
149	void
150	comm_select(void)
151	{
152	int num;
153	void (hdl)(fde_t , void *);
154
155	num = poll(pollfds, pollnum, SELECT_DELAY);
156
157	event_time_set();
158
159	if (num < 0)
160	{
161	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
162	nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
163	return;
164	}
165
166	for (int ci = 0; ci < pollnum && num > 0; ++ci)
167	{
168	int revents = pollfds[ci].revents;
169	if (revents == 0)
170	continue;
171
172	--num;
173
174	fde_t *F = &fd_table[pollfds[ci].fd];
175
176	if (F->flags.open == false)
177	continue;
178
179	if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
180	{
181	if ((hdl = F->read_handler))
182	{
183	F->read_handler = NULL;
184	hdl(F, F->read_data);
185
186	if (F->flags.open == false)
187	continue;
188	}
189	}
190
191	if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
192	{
193	if ((hdl = F->write_handler))
194	{
195	F->write_handler = NULL;
196	hdl(F, F->write_data);
197
198	if (F->flags.open == false)
199	continue;
200	}
201	}
202
203	comm_setselect(F, 0, NULL, NULL, 0);
204	}
205	}
206	#endif