8.0.0beta3/src/s_bsd_epoll.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  s_bsd_epoll.c: Linux epoll() compatible network routines.
 *
 *  Copyright (C) 2002-2005 Hybrid Development Team
 *  Based also on work of Adrian Chadd, Aaron Sethman and others.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

#include "stdinc.h"
#include "fdlist.h"
#include "ircd.h"
#include "memory.h"
#include "s_bsd.h"
#include "s_log.h"
#include <sys/epoll.h>
#include <sys/syscall.h>

static fde_t efd;

/* Thanks to ircu for the following ifdefs. */

/* The GNU C library may have a valid header but stub implementations
 * of the epoll system calls.  If so, provide our own. */
#if defined(__stub_epoll_create) || defined(__stub___epoll_create) || defined(EPOLL_NEED_BODY)

/* Oh, did we mention that some glibc releases do not even define the
 * syscall numbers? */
#if !defined(__NR_epoll_create)
#if defined(__ia64__)
#define __NR_epoll_create 1243
#define __NR_epoll_ctl 1244
#define __NR_epoll_wait 1245
#elif defined(__x86_64__)
#define __NR_epoll_create 214
#define __NR_epoll_ctl 233
#define __NR_epoll_wait 232
#elif defined(__sparc64__) || defined(__sparc__)
#define __NR_epoll_create 193
#define __NR_epoll_ctl 194
#define __NR_epoll_wait 195
#elif defined(__s390__) || defined(__m68k__)
#define __NR_epoll_create 249
#define __NR_epoll_ctl 250
#define __NR_epoll_wait 251
#elif defined(__ppc64__) || defined(__ppc__)
#define __NR_epoll_create 236
#define __NR_epoll_ctl 237
#define __NR_epoll_wait 238
#elif defined(__parisc__) || defined(__arm26__) || defined(__arm__)
#define __NR_epoll_create 224
#define __NR_epoll_ctl 225
#define __NR_epoll_wait 226
#elif defined(__alpha__)
#define __NR_epoll_create 407
#define __NR_epoll_ctl 408
#define __NR_epoll_wait 409
#elif defined(__sh64__)
#define __NR_epoll_create 282
#define __NR_epoll_ctl 283
#define __NR_epoll_wait 284
#elif defined(__i386__) || defined(__sh__) || defined(__m32r__) || defined(__h8300__) || defined(__frv__)
#define __NR_epoll_create 254
#define __NR_epoll_ctl 255
#define __NR_epoll_wait 256
#else /* cpu types */
#error No system call numbers defined for epoll family.
#endif /* cpu types */
#endif /* !defined(__NR_epoll_create) */

_syscall1(int, epoll_create, int, size)
_syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event)
_syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, int, maxevents, int, timeout)

#endif /* epoll_create defined as stub */

/*
 * 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(L_CRIT, "init_netio: Couldn't open epoll fd - %d: %s",
         errno, strerror(errno));
    exit(115); /* 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, PF *handler,
               void *client_data, time_t timeout)
{
  int new_events, op;
  struct epoll_event ep_event;

  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);

  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(L_CRIT, "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;
  PF *hdl;
  fde_t *F;

  num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);

  set_time();

  if (num < 0)
  {
#ifdef HAVE_USLEEP
    usleep(50000);  /* avoid 99% CPU in comm_select */
#endif
    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) != NULL)
      {
        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) != NULL)
      {
        F->write_handler = NULL;
        hdl(F, F->write_data);
        if (!F->flags.open)
          continue;
      }

    comm_setselect(F, 0, NULL, NULL, 0);
  }
}
Revision:	34
Committed:	Sun Oct 2 21:05:51 2005 UTC (20 years, 9 months ago) by lusky
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/s_bsd_epoll.c*
File size:	5835 byte(s)
Log Message:	create 7.2 branch, we can move/rename it as needed.
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* s_bsd_epoll.c: Linux epoll() compatible network routines.
4			*
5			* Copyright (C) 2002-2005 Hybrid Development Team
6			* Based also on work of Adrian Chadd, Aaron Sethman and others.
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21			* USA
22			*
23	knight	31	* $Id$
24	adx	30	*/
25
26			#include "stdinc.h"
27			#include "fdlist.h"
28			#include "ircd.h"
29			#include "memory.h"
30			#include "s_bsd.h"
31			#include "s_log.h"
32			#include <sys/epoll.h>
33			#include <sys/syscall.h>
34
35			static fde_t efd;
36
37			/* Thanks to ircu for the following ifdefs. */
38
39			/* The GNU C library may have a valid header but stub implementations
40			* of the epoll system calls. If so, provide our own. */
41			#if defined(__stub_epoll_create) \|\| defined(__stub___epoll_create) \|\| defined(EPOLL_NEED_BODY)
42
43			/* Oh, did we mention that some glibc releases do not even define the
44			* syscall numbers? */
45			#if !defined(__NR_epoll_create)
46			#if defined(__ia64__)
47			#define __NR_epoll_create 1243
48			#define __NR_epoll_ctl 1244
49			#define __NR_epoll_wait 1245
50			#elif defined(__x86_64__)
51			#define __NR_epoll_create 214
52			#define __NR_epoll_ctl 233
53			#define __NR_epoll_wait 232
54			#elif defined(__sparc64__) \|\| defined(__sparc__)
55			#define __NR_epoll_create 193
56			#define __NR_epoll_ctl 194
57			#define __NR_epoll_wait 195
58			#elif defined(__s390__) \|\| defined(__m68k__)
59			#define __NR_epoll_create 249
60			#define __NR_epoll_ctl 250
61			#define __NR_epoll_wait 251
62			#elif defined(__ppc64__) \|\| defined(__ppc__)
63			#define __NR_epoll_create 236
64			#define __NR_epoll_ctl 237
65			#define __NR_epoll_wait 238
66			#elif defined(__parisc__) \|\| defined(__arm26__) \|\| defined(__arm__)
67			#define __NR_epoll_create 224
68			#define __NR_epoll_ctl 225
69			#define __NR_epoll_wait 226
70			#elif defined(__alpha__)
71			#define __NR_epoll_create 407
72			#define __NR_epoll_ctl 408
73			#define __NR_epoll_wait 409
74			#elif defined(__sh64__)
75			#define __NR_epoll_create 282
76			#define __NR_epoll_ctl 283
77			#define __NR_epoll_wait 284
78			#elif defined(__i386__) \|\| defined(__sh__) \|\| defined(__m32r__) \|\| defined(__h8300__) \|\| defined(__frv__)
79			#define __NR_epoll_create 254
80			#define __NR_epoll_ctl 255
81			#define __NR_epoll_wait 256
82			#else /* cpu types */
83			#error No system call numbers defined for epoll family.
84			#endif /* cpu types */
85			#endif /* !defined(__NR_epoll_create) */
86
87			_syscall1(int, epoll_create, int, size)
88			_syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event)
89			_syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, int, maxevents, int, timeout)
90
91			#endif /* epoll_create defined as stub */
92
93			/*
94			* init_netio
95			*
96			* This is a needed exported function which will be called to initialise
97			* the network loop code.
98			*/
99			void
100			init_netio(void)
101			{
102			int fd;
103
104			if ((fd = epoll_create(hard_fdlimit)) < 0)
105			{
106			ilog(L_CRIT, "init_netio: Couldn't open epoll fd - %d: %s",
107			errno, strerror(errno));
108			exit(115); /* Whee! */
109			}
110
111			fd_open(&efd, fd, 0, "epoll file descriptor");
112			}
113
114			/*
115			* comm_setselect
116			*
117			* This is a needed exported function which will be called to register
118			* and deregister interest in a pending IO state for a given FD.
119			*/
120			void
121			comm_setselect(fde_t F, unsigned int type, PF handler,
122			void *client_data, time_t timeout)
123			{
124			int new_events, op;
125			struct epoll_event ep_event;
126
127			if ((type & COMM_SELECT_READ))
128			{
129			F->read_handler = handler;
130			F->read_data = client_data;
131			}
132
133			if ((type & COMM_SELECT_WRITE))
134			{
135			F->write_handler = handler;
136			F->write_data = client_data;
137			}
138
139			new_events = (F->read_handler ? EPOLLIN : 0) \|
140			(F->write_handler ? EPOLLOUT : 0);
141
142			if (timeout != 0)
143			F->timeout = CurrentTime + (timeout / 1000);
144
145			if (new_events != F->evcache)
146			{
147			if (new_events == 0)
148			op = EPOLL_CTL_DEL;
149			else if (F->evcache == 0)
150			op = EPOLL_CTL_ADD;
151			else
152			op = EPOLL_CTL_MOD;
153
154			ep_event.events = F->evcache = new_events;
155			ep_event.data.fd = F->fd;
156
157			if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0)
158			{
159			ilog(L_CRIT, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
160			abort();
161			}
162			}
163			}
164
165			/*
166			* comm_select()
167			*
168			* Called to do the new-style IO, courtesy of of squid (like most of this
169			* new IO code). This routine handles the stuff we've hidden in
170			* comm_setselect and fd_table[] and calls callbacks for IO ready
171			* events.
172			*/
173			void
174			comm_select(void)
175			{
176			struct epoll_event ep_fdlist[128];
177			int num, i;
178			PF *hdl;
179			fde_t *F;
180
181			num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);
182
183			set_time();
184
185			if (num < 0)
186			{
187			#ifdef HAVE_USLEEP
188			usleep(50000); /* avoid 99% CPU in comm_select */
189			#endif
190			return;
191			}
192
193			for (i = 0; i < num; i++)
194			{
195			F = lookup_fd(ep_fdlist[i].data.fd);
196			if (F == NULL \|\| !F->flags.open)
197			continue;
198
199			if ((ep_fdlist[i].events & (EPOLLIN \| EPOLLHUP \| EPOLLERR)))
200			if ((hdl = F->read_handler) != NULL)
201			{
202			F->read_handler = NULL;
203			hdl(F, F->read_data);
204			if (!F->flags.open)
205			continue;
206			}
207
208			if ((ep_fdlist[i].events & (EPOLLOUT \| EPOLLHUP \| EPOLLERR)))
209			if ((hdl = F->write_handler) != NULL)
210			{
211			F->write_handler = NULL;
212			hdl(F, F->write_data);
213			if (!F->flags.open)
214			continue;
215			}
216
217			comm_setselect(F, 0, NULL, NULL, 0);
218			}
219			}