577 lines
11 KiB
C
577 lines
11 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* epoll.c: Linux epoll compatible network routines.
|
|
*
|
|
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
|
|
* Copyright (C) 1996-2002 Hybrid Development Team
|
|
* Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
|
|
* Copyright (C) 2002-2005 ircd-ratbox development team
|
|
* Copyright (C) 2002 Aaron Sethman <androsyn@ratbox.org>
|
|
*
|
|
* 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
|
|
*
|
|
* $Id: epoll.c 26294 2008-12-13 03:01:19Z androsyn $
|
|
*/
|
|
#define _GNU_SOURCE 1
|
|
|
|
#include <libratbox_config.h>
|
|
#include <ratbox_lib.h>
|
|
#include <commio-int.h>
|
|
#include <event-int.h>
|
|
#if defined(HAVE_EPOLL_CTL) && (HAVE_SYS_EPOLL_H)
|
|
#define USING_EPOLL
|
|
#include <fcntl.h>
|
|
#include <sys/epoll.h>
|
|
|
|
#if defined(HAVE_SIGNALFD) && (HAVE_SYS_SIGNALFD_H) && (USE_TIMER_CREATE) && (HAVE_SYS_UIO_H)
|
|
#include <signal.h>
|
|
#include <sys/signalfd.h>
|
|
#include <sys/uio.h>
|
|
#define EPOLL_SCHED_EVENT 1
|
|
#endif
|
|
|
|
#if defined(USE_TIMERFD_CREATE)
|
|
#include <sys/timerfd.h>
|
|
#endif
|
|
|
|
#define RTSIGNAL SIGRTMIN
|
|
struct epoll_info
|
|
{
|
|
int ep;
|
|
struct epoll_event *pfd;
|
|
int pfd_size;
|
|
};
|
|
|
|
static struct epoll_info *ep_info;
|
|
static int can_do_event;
|
|
static int can_do_timerfd;
|
|
|
|
/*
|
|
* rb_init_netio
|
|
*
|
|
* This is a needed exported function which will be called to initialise
|
|
* the network loop code.
|
|
*/
|
|
int
|
|
rb_init_netio_epoll(void)
|
|
{
|
|
can_do_event = 0; /* shut up gcc */
|
|
can_do_timerfd = 0;
|
|
ep_info = rb_malloc(sizeof(struct epoll_info));
|
|
ep_info->pfd_size = getdtablesize();
|
|
ep_info->ep = epoll_create(ep_info->pfd_size);
|
|
if(ep_info->ep < 0)
|
|
{
|
|
return -1;
|
|
}
|
|
rb_open(ep_info->ep, RB_FD_UNKNOWN, "epoll file descriptor");
|
|
ep_info->pfd = rb_malloc(sizeof(struct epoll_event) * ep_info->pfd_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rb_setup_fd_epoll(rb_fde_t *F)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* rb_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
|
|
rb_setselect_epoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
|
|
{
|
|
struct epoll_event ep_event;
|
|
int old_flags = F->pflags;
|
|
int op = -1;
|
|
|
|
lrb_assert(IsFDOpen(F));
|
|
|
|
/* Update the list, even though we're not using it .. */
|
|
if(type & RB_SELECT_READ)
|
|
{
|
|
if(handler != NULL)
|
|
F->pflags |= EPOLLIN;
|
|
else
|
|
F->pflags &= ~EPOLLIN;
|
|
F->read_handler = handler;
|
|
F->read_data = client_data;
|
|
}
|
|
|
|
if(type & RB_SELECT_WRITE)
|
|
{
|
|
if(handler != NULL)
|
|
F->pflags |= EPOLLOUT;
|
|
else
|
|
F->pflags &= ~EPOLLOUT;
|
|
F->write_handler = handler;
|
|
F->write_data = client_data;
|
|
}
|
|
|
|
if(old_flags == 0 && F->pflags == 0)
|
|
return;
|
|
else if(F->pflags <= 0)
|
|
op = EPOLL_CTL_DEL;
|
|
else if(old_flags == 0 && F->pflags > 0)
|
|
op = EPOLL_CTL_ADD;
|
|
else if(F->pflags != old_flags)
|
|
op = EPOLL_CTL_MOD;
|
|
|
|
if(op == -1)
|
|
return;
|
|
|
|
ep_event.events = F->pflags;
|
|
ep_event.data.ptr = F;
|
|
|
|
if(op == EPOLL_CTL_ADD || op == EPOLL_CTL_MOD)
|
|
ep_event.events |= EPOLLET;
|
|
|
|
if(epoll_ctl(ep_info->ep, op, F->fd, &ep_event) != 0)
|
|
{
|
|
rb_lib_log("rb_setselect_epoll(): epoll_ctl failed: %s", strerror(errno));
|
|
abort();
|
|
}
|
|
|
|
|
|
}
|
|
|
|
/*
|
|
* rb_select
|
|
*
|
|
* Called to do the new-style IO, courtesy of squid (like most of this
|
|
* new IO code). This routine handles the stuff we've hidden in
|
|
* rb_setselect and fd_table[] and calls callbacks for IO ready
|
|
* events.
|
|
*/
|
|
|
|
int
|
|
rb_select_epoll(long delay)
|
|
{
|
|
int num, i, flags, old_flags, op;
|
|
struct epoll_event ep_event;
|
|
int o_errno;
|
|
void *data;
|
|
|
|
num = epoll_wait(ep_info->ep, ep_info->pfd, ep_info->pfd_size, delay);
|
|
|
|
/* save errno as rb_set_time() will likely clobber it */
|
|
o_errno = errno;
|
|
rb_set_time();
|
|
errno = o_errno;
|
|
|
|
if(num < 0 && !rb_ignore_errno(o_errno))
|
|
return RB_ERROR;
|
|
|
|
if(num <= 0)
|
|
return RB_OK;
|
|
|
|
for(i = 0; i < num; i++)
|
|
{
|
|
PF *hdl;
|
|
rb_fde_t *F = ep_info->pfd[i].data.ptr;
|
|
old_flags = F->pflags;
|
|
if(ep_info->pfd[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR))
|
|
{
|
|
hdl = F->read_handler;
|
|
data = F->read_data;
|
|
F->read_handler = NULL;
|
|
F->read_data = NULL;
|
|
if(hdl)
|
|
{
|
|
hdl(F, data);
|
|
}
|
|
}
|
|
|
|
if(!IsFDOpen(F))
|
|
continue;
|
|
if(ep_info->pfd[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR))
|
|
{
|
|
hdl = F->write_handler;
|
|
data = F->write_data;
|
|
F->write_handler = NULL;
|
|
F->write_data = NULL;
|
|
|
|
if(hdl)
|
|
{
|
|
hdl(F, data);
|
|
}
|
|
}
|
|
|
|
if(!IsFDOpen(F))
|
|
continue;
|
|
|
|
flags = 0;
|
|
|
|
if(F->read_handler != NULL)
|
|
flags |= EPOLLIN;
|
|
if(F->write_handler != NULL)
|
|
flags |= EPOLLOUT;
|
|
|
|
if(old_flags != flags)
|
|
{
|
|
if(flags == 0)
|
|
op = EPOLL_CTL_DEL;
|
|
else
|
|
op = EPOLL_CTL_MOD;
|
|
F->pflags = ep_event.events = flags;
|
|
ep_event.data.ptr = F;
|
|
if(op == EPOLL_CTL_MOD || op == EPOLL_CTL_ADD)
|
|
ep_event.events |= EPOLLET;
|
|
|
|
if(epoll_ctl(ep_info->ep, op, F->fd, &ep_event) != 0)
|
|
{
|
|
rb_lib_log("rb_select_epoll(): epoll_ctl failed: %s",
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
}
|
|
return RB_OK;
|
|
}
|
|
|
|
#ifdef EPOLL_SCHED_EVENT
|
|
int
|
|
rb_epoll_supports_event(void)
|
|
{
|
|
/* try to detect at runtime if everything we need actually works */
|
|
timer_t timer;
|
|
struct sigevent ev;
|
|
int fd;
|
|
sigset_t set;
|
|
|
|
if(can_do_event == 1)
|
|
return 1;
|
|
if(can_do_event == -1)
|
|
return 0;
|
|
|
|
#ifdef USE_TIMERFD_CREATE
|
|
if((fd = timerfd_create(CLOCK_REALTIME, 0)) >= 0)
|
|
{
|
|
close(fd);
|
|
can_do_event = 1;
|
|
can_do_timerfd = 1;
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
ev.sigev_signo = SIGVTALRM;
|
|
ev.sigev_notify = SIGEV_SIGNAL;
|
|
if(timer_create(CLOCK_REALTIME, &ev, &timer) != 0)
|
|
{
|
|
can_do_event = -1;
|
|
return 0;
|
|
}
|
|
timer_delete(timer);
|
|
sigemptyset(&set);
|
|
fd = signalfd(-1, &set, 0);
|
|
if(fd < 0)
|
|
{
|
|
can_do_event = -1;
|
|
return 0;
|
|
}
|
|
close(fd);
|
|
can_do_event = 1;
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* bleh..work around a glibc header bug on 32bit systems */
|
|
struct our_signalfd_siginfo
|
|
{
|
|
uint32_t signo;
|
|
int32_t err;
|
|
int32_t code;
|
|
uint32_t pid;
|
|
uint32_t uid;
|
|
int32_t fd;
|
|
uint32_t tid;
|
|
uint32_t band;
|
|
uint32_t overrun;
|
|
uint32_t trapno;
|
|
int32_t status;
|
|
int32_t svint;
|
|
uint64_t svptr;
|
|
uint64_t utime;
|
|
uint64_t stime;
|
|
uint64_t addr;
|
|
uint8_t pad[48];
|
|
};
|
|
|
|
|
|
#define SIGFDIOV_COUNT 16
|
|
static void
|
|
signalfd_handler(rb_fde_t *F, void *data)
|
|
{
|
|
static struct our_signalfd_siginfo fdsig[SIGFDIOV_COUNT];
|
|
static struct iovec iov[SIGFDIOV_COUNT];
|
|
struct ev_entry *ev;
|
|
int ret, x;
|
|
|
|
for(x = 0; x < SIGFDIOV_COUNT; x++)
|
|
{
|
|
iov[x].iov_base = &fdsig[x];
|
|
iov[x].iov_len = sizeof(struct our_signalfd_siginfo);
|
|
}
|
|
|
|
while(1)
|
|
{
|
|
ret = readv(rb_get_fd(F), iov, SIGFDIOV_COUNT);
|
|
|
|
if(ret == 0 || (ret < 0 && !rb_ignore_errno(errno)))
|
|
{
|
|
rb_close(F);
|
|
rb_epoll_init_event();
|
|
return;
|
|
}
|
|
|
|
if(ret < 0)
|
|
{
|
|
rb_setselect(F, RB_SELECT_READ, signalfd_handler, NULL);
|
|
return;
|
|
}
|
|
for(x = 0; x < ret / (int)sizeof(struct our_signalfd_siginfo); x++)
|
|
{
|
|
#if __WORDSIZE == 32 && defined(__sparc__)
|
|
uint32_t *q = (uint32_t *)&fdsig[x].svptr;
|
|
ev = (struct ev_entry *)q[0];
|
|
#else
|
|
ev = (struct ev_entry *)(uintptr_t)(fdsig[x].svptr);
|
|
|
|
#endif
|
|
if(ev == NULL)
|
|
continue;
|
|
rb_run_event(ev);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
rb_epoll_init_event(void)
|
|
{
|
|
|
|
sigset_t ss;
|
|
rb_fde_t *F;
|
|
int sfd;
|
|
rb_epoll_supports_event();
|
|
if(!can_do_timerfd)
|
|
{
|
|
sigemptyset(&ss);
|
|
sigaddset(&ss, RTSIGNAL);
|
|
sigprocmask(SIG_BLOCK, &ss, 0);
|
|
sigemptyset(&ss);
|
|
sigaddset(&ss, RTSIGNAL);
|
|
sfd = signalfd(-1, &ss, 0);
|
|
if(sfd == -1)
|
|
{
|
|
can_do_event = -1;
|
|
return;
|
|
}
|
|
F = rb_open(sfd, RB_FD_UNKNOWN, "signalfd");
|
|
rb_set_nb(F);
|
|
signalfd_handler(F, NULL);
|
|
}
|
|
}
|
|
|
|
static int
|
|
rb_epoll_sched_event_signalfd(struct ev_entry *event, int when)
|
|
{
|
|
timer_t *id;
|
|
struct sigevent ev;
|
|
struct itimerspec ts;
|
|
|
|
memset(&ev, 0, sizeof(&ev));
|
|
event->comm_ptr = rb_malloc(sizeof(timer_t));
|
|
id = event->comm_ptr;
|
|
ev.sigev_notify = SIGEV_SIGNAL;
|
|
ev.sigev_signo = RTSIGNAL;
|
|
ev.sigev_value.sival_ptr = event;
|
|
|
|
if(timer_create(CLOCK_REALTIME, &ev, id) < 0)
|
|
{
|
|
rb_lib_log("timer_create: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
memset(&ts, 0, sizeof(ts));
|
|
ts.it_value.tv_sec = when;
|
|
ts.it_value.tv_nsec = 0;
|
|
if(event->frequency != 0)
|
|
ts.it_interval = ts.it_value;
|
|
|
|
if(timer_settime(*id, 0, &ts, NULL) < 0)
|
|
{
|
|
rb_lib_log("timer_settime: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#ifdef USE_TIMERFD_CREATE
|
|
static void
|
|
rb_read_timerfd(rb_fde_t *F, void *data)
|
|
{
|
|
struct ev_entry *event = (struct ev_entry *)data;
|
|
int retlen;
|
|
uint64_t count;
|
|
|
|
if(event == NULL)
|
|
{
|
|
rb_close(F);
|
|
return;
|
|
}
|
|
|
|
retlen = rb_read(F, &count, sizeof(count));
|
|
|
|
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
|
|
{
|
|
rb_close(F);
|
|
rb_lib_log("rb_read_timerfd: timerfd[%s] closed on error: %s", event->name,
|
|
strerror(errno));
|
|
return;
|
|
}
|
|
rb_setselect(F, RB_SELECT_READ, rb_read_timerfd, event);
|
|
rb_run_event(event);
|
|
}
|
|
|
|
|
|
static int
|
|
rb_epoll_sched_event_timerfd(struct ev_entry *event, int when)
|
|
{
|
|
struct itimerspec ts;
|
|
static char buf[FD_DESC_SZ + 8];
|
|
int fd;
|
|
rb_fde_t *F;
|
|
|
|
if((fd = timerfd_create(CLOCK_REALTIME, 0)) < 0)
|
|
{
|
|
rb_lib_log("timerfd_create: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
|
|
memset(&ts, 0, sizeof(ts));
|
|
ts.it_value.tv_sec = when;
|
|
ts.it_value.tv_nsec = 0;
|
|
if(event->frequency != 0)
|
|
ts.it_interval = ts.it_value;
|
|
|
|
if(timerfd_settime(fd, 0, &ts, NULL) < 0)
|
|
{
|
|
rb_lib_log("timerfd_settime: %s\n", strerror(errno));
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
rb_snprintf(buf, sizeof(buf), "timerfd: %s", event->name);
|
|
F = rb_open(fd, RB_FD_UNKNOWN, buf);
|
|
rb_set_nb(F);
|
|
event->comm_ptr = F;
|
|
rb_setselect(F, RB_SELECT_READ, rb_read_timerfd, event);
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
int
|
|
rb_epoll_sched_event(struct ev_entry *event, int when)
|
|
{
|
|
#ifdef USE_TIMERFD_CREATE
|
|
if(can_do_timerfd)
|
|
{
|
|
return rb_epoll_sched_event_timerfd(event, when);
|
|
}
|
|
#endif
|
|
return rb_epoll_sched_event_signalfd(event, when);
|
|
}
|
|
|
|
void
|
|
rb_epoll_unsched_event(struct ev_entry *event)
|
|
{
|
|
#ifdef USE_TIMERFD_CREATE
|
|
if(can_do_timerfd)
|
|
{
|
|
rb_close((rb_fde_t *)event->comm_ptr);
|
|
event->comm_ptr = NULL;
|
|
return;
|
|
}
|
|
#endif
|
|
timer_delete(*((timer_t *) event->comm_ptr));
|
|
rb_free(event->comm_ptr);
|
|
event->comm_ptr = NULL;
|
|
}
|
|
#endif /* EPOLL_SCHED_EVENT */
|
|
|
|
#else /* epoll not supported here */
|
|
int
|
|
rb_init_netio_epoll(void)
|
|
{
|
|
return ENOSYS;
|
|
}
|
|
|
|
void
|
|
rb_setselect_epoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
|
|
{
|
|
errno = ENOSYS;
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_select_epoll(long delay)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
rb_setup_fd_epoll(rb_fde_t *F)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
#if !defined(USING_EPOLL) || !defined(EPOLL_SCHED_EVENT)
|
|
void
|
|
rb_epoll_init_event(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_epoll_sched_event(struct ev_entry *event, int when)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
rb_epoll_unsched_event(struct ev_entry *event)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_epoll_supports_event(void)
|
|
{
|
|
errno = ENOSYS;
|
|
return 0;
|
|
}
|
|
#endif /* !USING_EPOLL || !EPOLL_SCHED_EVENT */
|