trunk/src/s_bsd_epoll.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2005-2016 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_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 fde_t efd;


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

  if ((fd = epoll_create(hard_fdlimit)) < 0)
  {
    ilog(LOG_TYPE_IRCD, "init_netio: couldn't open epoll fd: %s",
         strerror(errno));
    exit(EXIT_FAILURE); /* Whee! */
  }

  fd_open(&efd, 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(efd.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 *);
  fde_t *F;

  num = epoll_wait(efd.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++)
  {
    F = lookup_fd(ep_fdlist[i].data.fd);
    if (F == NULL || !F->flags.open)
      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)
          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)
          continue;
      }
    }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
#endif
Revision:	7330
Committed:	Fri Feb 19 17:50:13 2016 UTC (10 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	4106 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) 2005-2016 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_epoll.c
23	* \brief Linux epoll() compatible network routines.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
29	#include "fdlist.h"
30	#include "ircd.h"
31	#include "s_bsd.h"
32	#include "log.h"
33	#include <sys/epoll.h>
34	#include <sys/syscall.h>
35
36	static fde_t efd;
37
38
39	/*
40	* init_netio
41	*
42	* This is a needed exported function which will be called to initialise
43	* the network loop code.
44	*/
45	void
46	init_netio(void)
47	{
48	int fd;
49
50	if ((fd = epoll_create(hard_fdlimit)) < 0)
51	{
52	ilog(LOG_TYPE_IRCD, "init_netio: couldn't open epoll fd: %s",
53	strerror(errno));
54	exit(EXIT_FAILURE); /* Whee! */
55	}
56
57	fd_open(&efd, fd, 0, "epoll file descriptor");
58	}
59
60	/*
61	* comm_setselect
62	*
63	* This is a needed exported function which will be called to register
64	* and deregister interest in a pending IO state for a given FD.
65	*/
66	void
67	comm_setselect(fde_t F, unsigned int type, void (handler)(fde_t , void ),
68	void *client_data, uintmax_t timeout)
69	{
70	int new_events, op;
71	struct epoll_event ep_event = { 0, { 0 } };
72
73	if ((type & COMM_SELECT_READ))
74	{
75	F->read_handler = handler;
76	F->read_data = client_data;
77	}
78
79	if ((type & COMM_SELECT_WRITE))
80	{
81	F->write_handler = handler;
82	F->write_data = client_data;
83	}
84
85	new_events = (F->read_handler ? EPOLLIN : 0) \|
86	(F->write_handler ? EPOLLOUT : 0);
87
88	if (timeout != 0)
89	{
90	F->timeout = CurrentTime + (timeout / 1000);
91	F->timeout_handler = handler;
92	F->timeout_data = client_data;
93	}
94
95	if (new_events != F->evcache)
96	{
97	if (new_events == 0)
98	op = EPOLL_CTL_DEL;
99	else if (F->evcache == 0)
100	op = EPOLL_CTL_ADD;
101	else
102	op = EPOLL_CTL_MOD;
103
104	ep_event.events = F->evcache = new_events;
105	ep_event.data.fd = F->fd;
106
107	if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0)
108	{
109	ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
110	abort();
111	}
112	}
113	}
114
115	/*
116	* comm_select()
117	*
118	* Called to do the new-style IO, courtesy of of squid (like most of this
119	* new IO code). This routine handles the stuff we've hidden in
120	* comm_setselect and fd_table[] and calls callbacks for IO ready
121	* events.
122	*/
123	void
124	comm_select(void)
125	{
126	struct epoll_event ep_fdlist[128];
127	int num, i;
128	void (hdl)(fde_t , void *);
129	fde_t *F;
130
131	num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);
132
133	set_time();
134
135	if (num < 0)
136	{
137	const struct timespec req = { .tv_sec = 0, .tv_nsec = 50000000 };
138	nanosleep(&req, NULL); /* Avoid 99% CPU in comm_select */
139	return;
140	}
141
142	for (i = 0; i < num; i++)
143	{
144	F = lookup_fd(ep_fdlist[i].data.fd);
145	if (F == NULL \|\| !F->flags.open)
146	continue;
147
148	if ((ep_fdlist[i].events & (EPOLLIN \| EPOLLHUP \| EPOLLERR)))
149	{
150	if ((hdl = F->read_handler))
151	{
152	F->read_handler = NULL;
153	hdl(F, F->read_data);
154	if (!F->flags.open)
155	continue;
156	}
157	}
158
159	if ((ep_fdlist[i].events & (EPOLLOUT \| EPOLLHUP \| EPOLLERR)))
160	{
161	if ((hdl = F->write_handler))
162	{
163	F->write_handler = NULL;
164	hdl(F, F->write_data);
165	if (!F->flags.open)
166	continue;
167	}
168	}
169
170	comm_setselect(F, 0, NULL, NULL, 0);
171	}
172	}
173	#endif