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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 2005-2014 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* 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 "memory.h"
#include "s_bsd.h"
#include "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(LOG_TYPE_IRCD, "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 = { 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;
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);
}
}
#endif
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