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epoll.c
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epoll.c
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/*
* Copyright 2000-2007 Niels Provos <[email protected]>
* Copyright 2007-2012 Niels Provos, Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "event2/event-config.h"
#include "evconfig-private.h"
#ifdef EVENT__HAVE_EPOLL
#include <stdint.h>
#include <sys/types.h>
#include <sys/resource.h>
#ifdef EVENT__HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/queue.h>
#include <sys/epoll.h>
#include <signal.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#ifdef EVENT__HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef EVENT__HAVE_SYS_TIMERFD_H
#include <sys/timerfd.h>
#endif
#include "event-internal.h"
#include "evsignal-internal.h"
#include "event2/thread.h"
#include "evthread-internal.h"
#include "log-internal.h"
#include "evmap-internal.h"
#include "changelist-internal.h"
#include "time-internal.h"
#if defined(EVENT__HAVE_SYS_TIMERFD_H) && \
defined(EVENT__HAVE_TIMERFD_CREATE) && \
defined(HAVE_POSIX_MONOTONIC) && defined(TFD_NONBLOCK) && \
defined(TFD_CLOEXEC)
/* Note that we only use timerfd if TFD_NONBLOCK and TFD_CLOEXEC are available
and working. This means that we can't support it on 2.6.25 (where timerfd
was introduced) or 2.6.26, since 2.6.27 introduced those flags.
*/
#define USING_TIMERFD
#endif
/* Since Linux 2.6.17, epoll is able to report about peer half-closed connection
using special EPOLLRDHUP flag on a read event.
*/
#if !defined(EPOLLRDHUP)
#define EPOLLRDHUP 0
#endif
struct epollop {
struct epoll_event *events;
int nevents;
int epfd;
#ifdef USING_TIMERFD
int timerfd;
#endif
};
static void *epoll_init(struct event_base *);
static int epoll_dispatch(struct event_base *, struct timeval *);
static void epoll_dealloc(struct event_base *);
static const struct eventop epollops_changelist = {
"epoll (with changelist)",
epoll_init,
event_changelist_add_,
event_changelist_del_,
epoll_dispatch,
epoll_dealloc,
1, /* need reinit */
EV_FEATURE_ET|EV_FEATURE_O1|EV_FEATURE_EARLY_CLOSE,
EVENT_CHANGELIST_FDINFO_SIZE
};
static int epoll_nochangelist_add(struct event_base *base, evutil_socket_t fd,
short old, short events, void *p);
static int epoll_nochangelist_del(struct event_base *base, evutil_socket_t fd,
short old, short events, void *p);
const struct eventop epollops = {
"epoll",
epoll_init,
epoll_nochangelist_add,
epoll_nochangelist_del,
epoll_dispatch,
epoll_dealloc,
1, /* need reinit */
EV_FEATURE_ET|EV_FEATURE_O1|EV_FEATURE_EARLY_CLOSE,
0
};
#define INITIAL_NEVENT 32
#define MAX_NEVENT 4096
/* On Linux kernels at least up to 2.6.24.4, epoll can't handle timeout
* values bigger than (LONG_MAX - 999ULL)/HZ. HZ in the wild can be
* as big as 1000, and LONG_MAX can be as small as (1<<31)-1, so the
* largest number of msec we can support here is 2147482. Let's
* round that down by 47 seconds.
*/
#define MAX_EPOLL_TIMEOUT_MSEC (35*60*1000)
static void *
epoll_init(struct event_base *base)
{
int epfd = -1;
struct epollop *epollop;
#ifdef EVENT__HAVE_EPOLL_CREATE1
/* First, try the shiny new epoll_create1 interface, if we have it. */
epfd = epoll_create1(EPOLL_CLOEXEC);
#endif
if (epfd == -1) {
/* Initialize the kernel queue using the old interface. (The
size field is ignored since 2.6.8.) */
if ((epfd = epoll_create(32000)) == -1) {
if (errno != ENOSYS)
event_warn("epoll_create");
return (NULL);
}
evutil_make_socket_closeonexec(epfd);
}
if (!(epollop = mm_calloc(1, sizeof(struct epollop)))) {
close(epfd);
return (NULL);
}
epollop->epfd = epfd;
/* Initialize fields */
epollop->events = mm_calloc(INITIAL_NEVENT, sizeof(struct epoll_event));
if (epollop->events == NULL) {
mm_free(epollop);
close(epfd);
return (NULL);
}
epollop->nevents = INITIAL_NEVENT;
if ((base->flags & EVENT_BASE_FLAG_EPOLL_USE_CHANGELIST) != 0 ||
((base->flags & EVENT_BASE_FLAG_IGNORE_ENV) == 0 &&
evutil_getenv_("EVENT_EPOLL_USE_CHANGELIST") != NULL)) {
base->evsel = &epollops_changelist;
}
#ifdef USING_TIMERFD
/*
The epoll interface ordinarily gives us one-millisecond precision,
so on Linux it makes perfect sense to use the CLOCK_MONOTONIC_COARSE
timer. But when the user has set the new PRECISE_TIMER flag for an
event_base, we can try to use timerfd to give them finer granularity.
*/
if ((base->flags & EVENT_BASE_FLAG_PRECISE_TIMER) &&
base->monotonic_timer.monotonic_clock == CLOCK_MONOTONIC) {
int fd;
fd = epollop->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
if (epollop->timerfd >= 0) {
struct epoll_event epev;
memset(&epev, 0, sizeof(epev));
epev.data.fd = epollop->timerfd;
epev.events = EPOLLIN;
if (epoll_ctl(epollop->epfd, EPOLL_CTL_ADD, fd, &epev) < 0) {
event_warn("epoll_ctl(timerfd)");
close(fd);
epollop->timerfd = -1;
}
} else {
if (errno != EINVAL && errno != ENOSYS) {
/* These errors probably mean that we were
* compiled with timerfd/TFD_* support, but
* we're running on a kernel that lacks those.
*/
event_warn("timerfd_create");
}
epollop->timerfd = -1;
}
} else {
epollop->timerfd = -1;
}
#endif
evsig_init_(base);
return (epollop);
}
static const char *
change_to_string(int change)
{
change &= (EV_CHANGE_ADD|EV_CHANGE_DEL);
if (change == EV_CHANGE_ADD) {
return "add";
} else if (change == EV_CHANGE_DEL) {
return "del";
} else if (change == 0) {
return "none";
} else {
return "???";
}
}
static const char *
epoll_op_to_string(int op)
{
return op == EPOLL_CTL_ADD?"ADD":
op == EPOLL_CTL_DEL?"DEL":
op == EPOLL_CTL_MOD?"MOD":
"???";
}
/*
Here are the values we're masking off to decide what operations to do.
Note that since EV_READ|EV_WRITE.
Note also that this table is a little sparse, since ADD+DEL is
nonsensical ("xxx" in the list below.)
Note also also that we are shifting old_events by only 5 bits, since
EV_READ is 2 and EV_WRITE is 4.
The table was auto-generated with a python script, according to this
pseudocode:
If either the read or the write change is add+del:
This is impossible; Set op==-1, events=0.
Else, if either the read or the write change is add:
Set events to 0.
If the read change is add, or
(the read change is not del, and ev_read is in old_events):
Add EPOLLIN to events.
If the write change is add, or
(the write change is not del, and ev_write is in old_events):
Add EPOLLOUT to events.
If old_events is set:
Set op to EPOLL_CTL_MOD [*1,*2]
Else:
Set op to EPOLL_CTL_ADD [*3]
Else, if the read or the write change is del:
Set op to EPOLL_CTL_DEL.
If the read change is del:
If the write change is del:
Set events to EPOLLIN|EPOLLOUT
Else if ev_write is in old_events:
Set events to EPOLLOUT
Set op to EPOLL_CTL_MOD
Else
Set events to EPOLLIN
Else:
{The write change is del.}
If ev_read is in old_events:
Set events to EPOLLIN
Set op to EPOLL_CTL_MOD
Else:
Set the events to EPOLLOUT
Else:
There is no read or write change; set op to 0 and events to 0.
The logic is a little tricky, since we had no events set on the fd before,
we need to set op="ADD" and set events=the events we want to add. If we
had any events set on the fd before, and we want any events to remain on
the fd, we need to say op="MOD" and set events=the events we want to
remain. But if we want to delete the last event, we say op="DEL" and
set events=(any non-null pointer).
[*1] This MOD is only a guess. MOD might fail with ENOENT if the file was
closed and a new file was opened with the same fd. If so, we'll retry
with ADD.
[*2] We can't replace this with a no-op even if old_events is the same as
the new events: if the file was closed and reopened, we need to retry
with an ADD. (We do a MOD in this case since "no change" is more
common than "close and reopen", so we'll usually wind up doing 1
syscalls instead of 2.)
[*3] This ADD is only a guess. There is a fun Linux kernel issue where if
you have two fds for the same file (via dup) and you ADD one to an
epfd, then close it, then re-create it with the same fd (via dup2 or an
unlucky dup), then try to ADD it again, you'll get an EEXIST, since the
struct epitem is not actually removed from the struct eventpoll until
the file itself is closed.
EV_CHANGE_ADD==1
EV_CHANGE_DEL==2
EV_READ ==2
EV_WRITE ==4
EV_CLOSED ==0x80
Bit 0: close change is add
Bit 1: close change is del
Bit 2: read change is add
Bit 3: read change is del
Bit 4: write change is add
Bit 5: write change is del
Bit 6: old events had EV_READ
Bit 7: old events had EV_WRITE
Bit 8: old events had EV_CLOSED
*/
#define INDEX(c) \
( (((c)->close_change&(EV_CHANGE_ADD|EV_CHANGE_DEL))) | \
(((c)->read_change&(EV_CHANGE_ADD|EV_CHANGE_DEL)) << 2) | \
(((c)->write_change&(EV_CHANGE_ADD|EV_CHANGE_DEL)) << 4) | \
(((c)->old_events&(EV_READ|EV_WRITE)) << 5) | \
(((c)->old_events&(EV_CLOSED)) << 1) \
)
#if EV_READ != 2 || EV_WRITE != 4 || EV_CHANGE_ADD != 1 || EV_CHANGE_DEL != 2
#error "Libevent's internals changed! Regenerate the op_table in epoll.c"
#endif
static const struct operation {
int events;
int op;
} op_table[] = {
/* old= 0, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= 0, write: 0, read: 0, close:add */
{ EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write: 0, read: 0, close:del */
{ EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= 0, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= 0, write: 0, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_ADD },
/* old= 0, write: 0, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write: 0, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_ADD },
/* old= 0, write: 0, read:add, close:xxx */
{ 0, 255 },
/* old= 0, write: 0, read:del, close: 0 */
{ EPOLLIN, EPOLL_CTL_DEL },
/* old= 0, write: 0, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write: 0, read:del, close:del */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= 0, write: 0, read:del, close:xxx */
{ 0, 255 },
/* old= 0, write: 0, read:xxx, close: 0 */
{ 0, 255 },
/* old= 0, write: 0, read:xxx, close:add */
{ 0, 255 },
/* old= 0, write: 0, read:xxx, close:del */
{ 0, 255 },
/* old= 0, write: 0, read:xxx, close:xxx */
{ 0, 255 },
/* old= 0, write:add, read: 0, close: 0 */
{ EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read: 0, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:add, read: 0, close:del */
{ EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read: 0, close:xxx */
{ 0, 255 },
/* old= 0, write:add, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:add, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read:add, close:xxx */
{ 0, 255 },
/* old= 0, write:add, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:add, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_ADD },
/* old= 0, write:add, read:del, close:xxx */
{ 0, 255 },
/* old= 0, write:add, read:xxx, close: 0 */
{ 0, 255 },
/* old= 0, write:add, read:xxx, close:add */
{ 0, 255 },
/* old= 0, write:add, read:xxx, close:del */
{ 0, 255 },
/* old= 0, write:add, read:xxx, close:xxx */
{ 0, 255 },
/* old= 0, write:del, read: 0, close: 0 */
{ EPOLLOUT, EPOLL_CTL_DEL },
/* old= 0, write:del, read: 0, close:add */
{ EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:del, read: 0, close:del */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= 0, write:del, read: 0, close:xxx */
{ 0, 255 },
/* old= 0, write:del, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_ADD },
/* old= 0, write:del, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:del, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_ADD },
/* old= 0, write:del, read:add, close:xxx */
{ 0, 255 },
/* old= 0, write:del, read:del, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_DEL },
/* old= 0, write:del, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_ADD },
/* old= 0, write:del, read:del, close:del */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= 0, write:del, read:del, close:xxx */
{ 0, 255 },
/* old= 0, write:del, read:xxx, close: 0 */
{ 0, 255 },
/* old= 0, write:del, read:xxx, close:add */
{ 0, 255 },
/* old= 0, write:del, read:xxx, close:del */
{ 0, 255 },
/* old= 0, write:del, read:xxx, close:xxx */
{ 0, 255 },
/* old= 0, write:xxx, read: 0, close: 0 */
{ 0, 255 },
/* old= 0, write:xxx, read: 0, close:add */
{ 0, 255 },
/* old= 0, write:xxx, read: 0, close:del */
{ 0, 255 },
/* old= 0, write:xxx, read: 0, close:xxx */
{ 0, 255 },
/* old= 0, write:xxx, read:add, close: 0 */
{ 0, 255 },
/* old= 0, write:xxx, read:add, close:add */
{ 0, 255 },
/* old= 0, write:xxx, read:add, close:del */
{ 0, 255 },
/* old= 0, write:xxx, read:add, close:xxx */
{ 0, 255 },
/* old= 0, write:xxx, read:del, close: 0 */
{ 0, 255 },
/* old= 0, write:xxx, read:del, close:add */
{ 0, 255 },
/* old= 0, write:xxx, read:del, close:del */
{ 0, 255 },
/* old= 0, write:xxx, read:del, close:xxx */
{ 0, 255 },
/* old= 0, write:xxx, read:xxx, close: 0 */
{ 0, 255 },
/* old= 0, write:xxx, read:xxx, close:add */
{ 0, 255 },
/* old= 0, write:xxx, read:xxx, close:del */
{ 0, 255 },
/* old= 0, write:xxx, read:xxx, close:xxx */
{ 0, 255 },
/* old= r, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= r, write: 0, read: 0, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write: 0, read: 0, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= r, write: 0, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write: 0, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write: 0, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write: 0, read:add, close:xxx */
{ 0, 255 },
/* old= r, write: 0, read:del, close: 0 */
{ EPOLLIN, EPOLL_CTL_DEL },
/* old= r, write: 0, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write: 0, read:del, close:del */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= r, write: 0, read:del, close:xxx */
{ 0, 255 },
/* old= r, write: 0, read:xxx, close: 0 */
{ 0, 255 },
/* old= r, write: 0, read:xxx, close:add */
{ 0, 255 },
/* old= r, write: 0, read:xxx, close:del */
{ 0, 255 },
/* old= r, write: 0, read:xxx, close:xxx */
{ 0, 255 },
/* old= r, write:add, read: 0, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read: 0, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:add, read: 0, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read: 0, close:xxx */
{ 0, 255 },
/* old= r, write:add, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:add, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read:add, close:xxx */
{ 0, 255 },
/* old= r, write:add, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:add, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= r, write:add, read:del, close:xxx */
{ 0, 255 },
/* old= r, write:add, read:xxx, close: 0 */
{ 0, 255 },
/* old= r, write:add, read:xxx, close:add */
{ 0, 255 },
/* old= r, write:add, read:xxx, close:del */
{ 0, 255 },
/* old= r, write:add, read:xxx, close:xxx */
{ 0, 255 },
/* old= r, write:del, read: 0, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write:del, read: 0, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:del, read: 0, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write:del, read: 0, close:xxx */
{ 0, 255 },
/* old= r, write:del, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write:del, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:del, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= r, write:del, read:add, close:xxx */
{ 0, 255 },
/* old= r, write:del, read:del, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_DEL },
/* old= r, write:del, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= r, write:del, read:del, close:del */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= r, write:del, read:del, close:xxx */
{ 0, 255 },
/* old= r, write:del, read:xxx, close: 0 */
{ 0, 255 },
/* old= r, write:del, read:xxx, close:add */
{ 0, 255 },
/* old= r, write:del, read:xxx, close:del */
{ 0, 255 },
/* old= r, write:del, read:xxx, close:xxx */
{ 0, 255 },
/* old= r, write:xxx, read: 0, close: 0 */
{ 0, 255 },
/* old= r, write:xxx, read: 0, close:add */
{ 0, 255 },
/* old= r, write:xxx, read: 0, close:del */
{ 0, 255 },
/* old= r, write:xxx, read: 0, close:xxx */
{ 0, 255 },
/* old= r, write:xxx, read:add, close: 0 */
{ 0, 255 },
/* old= r, write:xxx, read:add, close:add */
{ 0, 255 },
/* old= r, write:xxx, read:add, close:del */
{ 0, 255 },
/* old= r, write:xxx, read:add, close:xxx */
{ 0, 255 },
/* old= r, write:xxx, read:del, close: 0 */
{ 0, 255 },
/* old= r, write:xxx, read:del, close:add */
{ 0, 255 },
/* old= r, write:xxx, read:del, close:del */
{ 0, 255 },
/* old= r, write:xxx, read:del, close:xxx */
{ 0, 255 },
/* old= r, write:xxx, read:xxx, close: 0 */
{ 0, 255 },
/* old= r, write:xxx, read:xxx, close:add */
{ 0, 255 },
/* old= r, write:xxx, read:xxx, close:del */
{ 0, 255 },
/* old= r, write:xxx, read:xxx, close:xxx */
{ 0, 255 },
/* old= w, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= w, write: 0, read: 0, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write: 0, read: 0, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= w, write: 0, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write: 0, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write: 0, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write: 0, read:add, close:xxx */
{ 0, 255 },
/* old= w, write: 0, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write: 0, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write: 0, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write: 0, read:del, close:xxx */
{ 0, 255 },
/* old= w, write: 0, read:xxx, close: 0 */
{ 0, 255 },
/* old= w, write: 0, read:xxx, close:add */
{ 0, 255 },
/* old= w, write: 0, read:xxx, close:del */
{ 0, 255 },
/* old= w, write: 0, read:xxx, close:xxx */
{ 0, 255 },
/* old= w, write:add, read: 0, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read: 0, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:add, read: 0, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read: 0, close:xxx */
{ 0, 255 },
/* old= w, write:add, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:add, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read:add, close:xxx */
{ 0, 255 },
/* old= w, write:add, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:add, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= w, write:add, read:del, close:xxx */
{ 0, 255 },
/* old= w, write:add, read:xxx, close: 0 */
{ 0, 255 },
/* old= w, write:add, read:xxx, close:add */
{ 0, 255 },
/* old= w, write:add, read:xxx, close:del */
{ 0, 255 },
/* old= w, write:add, read:xxx, close:xxx */
{ 0, 255 },
/* old= w, write:del, read: 0, close: 0 */
{ EPOLLOUT, EPOLL_CTL_DEL },
/* old= w, write:del, read: 0, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:del, read: 0, close:del */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= w, write:del, read: 0, close:xxx */
{ 0, 255 },
/* old= w, write:del, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= w, write:del, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:del, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= w, write:del, read:add, close:xxx */
{ 0, 255 },
/* old= w, write:del, read:del, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_DEL },
/* old= w, write:del, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= w, write:del, read:del, close:del */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= w, write:del, read:del, close:xxx */
{ 0, 255 },
/* old= w, write:del, read:xxx, close: 0 */
{ 0, 255 },
/* old= w, write:del, read:xxx, close:add */
{ 0, 255 },
/* old= w, write:del, read:xxx, close:del */
{ 0, 255 },
/* old= w, write:del, read:xxx, close:xxx */
{ 0, 255 },
/* old= w, write:xxx, read: 0, close: 0 */
{ 0, 255 },
/* old= w, write:xxx, read: 0, close:add */
{ 0, 255 },
/* old= w, write:xxx, read: 0, close:del */
{ 0, 255 },
/* old= w, write:xxx, read: 0, close:xxx */
{ 0, 255 },
/* old= w, write:xxx, read:add, close: 0 */
{ 0, 255 },
/* old= w, write:xxx, read:add, close:add */
{ 0, 255 },
/* old= w, write:xxx, read:add, close:del */
{ 0, 255 },
/* old= w, write:xxx, read:add, close:xxx */
{ 0, 255 },
/* old= w, write:xxx, read:del, close: 0 */
{ 0, 255 },
/* old= w, write:xxx, read:del, close:add */
{ 0, 255 },
/* old= w, write:xxx, read:del, close:del */
{ 0, 255 },
/* old= w, write:xxx, read:del, close:xxx */
{ 0, 255 },
/* old= w, write:xxx, read:xxx, close: 0 */
{ 0, 255 },
/* old= w, write:xxx, read:xxx, close:add */
{ 0, 255 },
/* old= w, write:xxx, read:xxx, close:del */
{ 0, 255 },
/* old= w, write:xxx, read:xxx, close:xxx */
{ 0, 255 },
/* old= rw, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= rw, write: 0, read: 0, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write: 0, read: 0, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= rw, write: 0, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:add, close:xxx */
{ 0, 255 },
/* old= rw, write: 0, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write: 0, read:del, close:xxx */
{ 0, 255 },
/* old= rw, write: 0, read:xxx, close: 0 */
{ 0, 255 },
/* old= rw, write: 0, read:xxx, close:add */
{ 0, 255 },
/* old= rw, write: 0, read:xxx, close:del */
{ 0, 255 },
/* old= rw, write: 0, read:xxx, close:xxx */
{ 0, 255 },
/* old= rw, write:add, read: 0, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read: 0, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:add, read: 0, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read: 0, close:xxx */
{ 0, 255 },
/* old= rw, write:add, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:add, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read:add, close:xxx */
{ 0, 255 },
/* old= rw, write:add, read:del, close: 0 */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:add, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= rw, write:add, read:del, close:xxx */
{ 0, 255 },
/* old= rw, write:add, read:xxx, close: 0 */
{ 0, 255 },
/* old= rw, write:add, read:xxx, close:add */
{ 0, 255 },
/* old= rw, write:add, read:xxx, close:del */
{ 0, 255 },
/* old= rw, write:add, read:xxx, close:xxx */
{ 0, 255 },
/* old= rw, write:del, read: 0, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= rw, write:del, read: 0, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:del, read: 0, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= rw, write:del, read: 0, close:xxx */
{ 0, 255 },
/* old= rw, write:del, read:add, close: 0 */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= rw, write:del, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:del, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= rw, write:del, read:add, close:xxx */
{ 0, 255 },
/* old= rw, write:del, read:del, close: 0 */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_DEL },
/* old= rw, write:del, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= rw, write:del, read:del, close:del */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= rw, write:del, read:del, close:xxx */
{ 0, 255 },
/* old= rw, write:del, read:xxx, close: 0 */
{ 0, 255 },
/* old= rw, write:del, read:xxx, close:add */
{ 0, 255 },
/* old= rw, write:del, read:xxx, close:del */
{ 0, 255 },
/* old= rw, write:del, read:xxx, close:xxx */
{ 0, 255 },
/* old= rw, write:xxx, read: 0, close: 0 */
{ 0, 255 },
/* old= rw, write:xxx, read: 0, close:add */
{ 0, 255 },
/* old= rw, write:xxx, read: 0, close:del */
{ 0, 255 },
/* old= rw, write:xxx, read: 0, close:xxx */
{ 0, 255 },
/* old= rw, write:xxx, read:add, close: 0 */
{ 0, 255 },
/* old= rw, write:xxx, read:add, close:add */
{ 0, 255 },
/* old= rw, write:xxx, read:add, close:del */
{ 0, 255 },
/* old= rw, write:xxx, read:add, close:xxx */
{ 0, 255 },
/* old= rw, write:xxx, read:del, close: 0 */
{ 0, 255 },
/* old= rw, write:xxx, read:del, close:add */
{ 0, 255 },
/* old= rw, write:xxx, read:del, close:del */
{ 0, 255 },
/* old= rw, write:xxx, read:del, close:xxx */
{ 0, 255 },
/* old= rw, write:xxx, read:xxx, close: 0 */
{ 0, 255 },
/* old= rw, write:xxx, read:xxx, close:add */
{ 0, 255 },
/* old= rw, write:xxx, read:xxx, close:del */
{ 0, 255 },
/* old= rw, write:xxx, read:xxx, close:xxx */
{ 0, 255 },
/* old= c, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= c, write: 0, read: 0, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write: 0, read: 0, close:del */
{ EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= c, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= c, write: 0, read:add, close: 0 */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write: 0, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write: 0, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= c, write: 0, read:add, close:xxx */
{ 0, 255 },
/* old= c, write: 0, read:del, close: 0 */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write: 0, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write: 0, read:del, close:del */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= c, write: 0, read:del, close:xxx */
{ 0, 255 },
/* old= c, write: 0, read:xxx, close: 0 */
{ 0, 255 },
/* old= c, write: 0, read:xxx, close:add */
{ 0, 255 },
/* old= c, write: 0, read:xxx, close:del */
{ 0, 255 },
/* old= c, write: 0, read:xxx, close:xxx */
{ 0, 255 },
/* old= c, write:add, read: 0, close: 0 */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read: 0, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read: 0, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= c, write:add, read: 0, close:xxx */
{ 0, 255 },
/* old= c, write:add, read:add, close: 0 */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read:add, close:add */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read:add, close:del */
{ EPOLLIN|EPOLLOUT, EPOLL_CTL_MOD },
/* old= c, write:add, read:add, close:xxx */
{ 0, 255 },
/* old= c, write:add, read:del, close: 0 */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read:del, close:add */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:add, read:del, close:del */
{ EPOLLOUT, EPOLL_CTL_MOD },
/* old= c, write:add, read:del, close:xxx */
{ 0, 255 },
/* old= c, write:add, read:xxx, close: 0 */
{ 0, 255 },
/* old= c, write:add, read:xxx, close:add */
{ 0, 255 },
/* old= c, write:add, read:xxx, close:del */
{ 0, 255 },
/* old= c, write:add, read:xxx, close:xxx */
{ 0, 255 },
/* old= c, write:del, read: 0, close: 0 */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read: 0, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read: 0, close:del */
{ EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= c, write:del, read: 0, close:xxx */
{ 0, 255 },
/* old= c, write:del, read:add, close: 0 */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read:add, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read:add, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= c, write:del, read:add, close:xxx */
{ 0, 255 },
/* old= c, write:del, read:del, close: 0 */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read:del, close:add */
{ EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= c, write:del, read:del, close:del */
{ EPOLLIN|EPOLLOUT|EPOLLRDHUP, EPOLL_CTL_DEL },
/* old= c, write:del, read:del, close:xxx */
{ 0, 255 },
/* old= c, write:del, read:xxx, close: 0 */
{ 0, 255 },
/* old= c, write:del, read:xxx, close:add */
{ 0, 255 },
/* old= c, write:del, read:xxx, close:del */
{ 0, 255 },
/* old= c, write:del, read:xxx, close:xxx */
{ 0, 255 },
/* old= c, write:xxx, read: 0, close: 0 */
{ 0, 255 },
/* old= c, write:xxx, read: 0, close:add */
{ 0, 255 },
/* old= c, write:xxx, read: 0, close:del */
{ 0, 255 },
/* old= c, write:xxx, read: 0, close:xxx */
{ 0, 255 },
/* old= c, write:xxx, read:add, close: 0 */
{ 0, 255 },
/* old= c, write:xxx, read:add, close:add */
{ 0, 255 },
/* old= c, write:xxx, read:add, close:del */
{ 0, 255 },
/* old= c, write:xxx, read:add, close:xxx */
{ 0, 255 },
/* old= c, write:xxx, read:del, close: 0 */
{ 0, 255 },
/* old= c, write:xxx, read:del, close:add */
{ 0, 255 },
/* old= c, write:xxx, read:del, close:del */
{ 0, 255 },
/* old= c, write:xxx, read:del, close:xxx */
{ 0, 255 },
/* old= c, write:xxx, read:xxx, close: 0 */
{ 0, 255 },
/* old= c, write:xxx, read:xxx, close:add */
{ 0, 255 },
/* old= c, write:xxx, read:xxx, close:del */
{ 0, 255 },
/* old= c, write:xxx, read:xxx, close:xxx */
{ 0, 255 },
/* old= cr, write: 0, read: 0, close: 0 */
{ 0, 0 },
/* old= cr, write: 0, read: 0, close:add */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },
/* old= cr, write: 0, read: 0, close:del */
{ EPOLLIN, EPOLL_CTL_MOD },
/* old= cr, write: 0, read: 0, close:xxx */
{ 0, 255 },
/* old= cr, write: 0, read:add, close: 0 */
{ EPOLLIN|EPOLLRDHUP, EPOLL_CTL_MOD },