8.2.x/src/s_bsd_poll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2016 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;


/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(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;

  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 != 0)
  {
    F->timeout = CurrentTime + (timeout / 1000);
    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 = lookup_fd(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, ci;
  void (*hdl)(fde_t *, void *);
  fde_t *F;

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

    if (revents == 0)
      continue;
    num--;

    F = lookup_fd(pollfds[ci].fd);
    assert(F);
    if (!F->flags.open)
      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)
          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)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	7329
Committed:	Thu Feb 18 21:07:50 2016 UTC (8 years, 1 month ago) by michael
Content type:	text/x-csrc
File size:	4673 byte(s)
Log Message:	- Now that we got time_t to work nicely on openbsd with snprintf's conversion specifiers, we ran into a similiar issue on Raspbian/ARMv7's time_t which is of signed 32 bit and doesn't cope at all with %j. Instead of doing tricks, get rid of time_t everywhere and forever and use uintmax_t instead which has at least a 'standardized' conversion specifier associated with it.
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2000-2016 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	* init_netio
52	*
53	* This is a needed exported function which will be called to initialise
54	* the network loop code.
55	*/
56	void
57	init_netio(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	if ((type & COMM_SELECT_READ))
76	{
77	F->read_handler = handler;
78	F->read_data = client_data;
79	}
80
81	if ((type & COMM_SELECT_WRITE))
82	{
83	F->write_handler = handler;
84	F->write_data = client_data;
85	}
86
87	new_events = (F->read_handler ? POLLRDNORM : 0) \|
88	(F->write_handler ? POLLWRNORM : 0);
89
90	if (timeout != 0)
91	{
92	F->timeout = CurrentTime + (timeout / 1000);
93	F->timeout_handler = handler;
94	F->timeout_data = client_data;
95	}
96
97	if (new_events != F->evcache)
98	{
99	if (new_events == 0)
100	{
101	if (F->comm_index != pollnum - 1)
102	{
103	fde_t *other = lookup_fd(pollfds[pollnum - 1].fd);
104
105	pollfds[F->comm_index].fd = pollfds[pollnum - 1].fd;
106	pollfds[F->comm_index].events = pollfds[pollnum - 1].events;
107	pollfds[F->comm_index].revents = pollfds[pollnum - 1].revents;
108
109	assert(other);
110	other->comm_index = F->comm_index;
111	}
112
113	F->comm_index = -1;
114	--pollnum;
115	}
116	else
117	{
118	if (F->evcache == 0)
119	{
120	if (pollnum >= pollfds_size)
121	{
122	pollfds_size *= 2;
123	pollfds = xrealloc(pollfds, sizeof(struct pollfd) * pollfds_size);
124	}
125
126	F->comm_index = pollnum++;
127	pollfds[F->comm_index].fd = F->fd;
128	}
129
130	pollfds[F->comm_index].events = new_events;
131	pollfds[F->comm_index].revents = 0;
132	}
133
134	F->evcache = new_events;
135	}
136	}
137
138	/*
139	* comm_select
140	*
141	* Called to do the new-style IO, courtesy of of squid (like most of this
142	* new IO code). This routine handles the stuff we've hidden in
143	* comm_setselect and fd_table[] and calls callbacks for IO ready
144	* events.
145	*/
146	void
147	comm_select(void)
148	{
149	int num, ci;
150	void (hdl)(fde_t , void *);
151	fde_t *F;
152
153	num = poll(pollfds, pollnum, SELECT_DELAY);
154
155	set_time();
156
157	if (num < 0)
158	{
159	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
160	nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
161	return;
162	}
163
164	for (ci = 0; ci < pollnum && num > 0; ci++)
165	{
166	int revents = pollfds[ci].revents;
167
168	if (revents == 0)
169	continue;
170	num--;
171
172	F = lookup_fd(pollfds[ci].fd);
173	assert(F);
174	if (!F->flags.open)
175	continue;
176
177	if (revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
178	{
179	if ((hdl = F->read_handler))
180	{
181	F->read_handler = NULL;
182	hdl(F, F->read_data);
183	if (!F->flags.open)
184	continue;
185	}
186	}
187
188	if (revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
189	{
190	if ((hdl = F->write_handler))
191	{
192	F->write_handler = NULL;
193	hdl(F, F->write_data);
194	if (!F->flags.open)
195	continue;
196	}
197	}
198
199	comm_setselect(F, 0, NULL, NULL, 0);
200	}
201	}
202	#endif