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Events: support for EPOLLRDHUP (ticket #320).

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Since Linux 2.6.17, epoll is able to report about peer half-closed connection
using special EPOLLRDHUP flag on a read event.
This commit is contained in:
Valentin Bartenev 2013-07-12 14:51:07 +04:00
parent 0f0502064d
commit 182a05b9d5
4 changed files with 37 additions and 7 deletions
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1
auto/modules
View File

@ -42,6 +42,7 @@ fi
if [ $NGX_TEST_BUILD_EPOLL = YES ]; then
have=NGX_HAVE_EPOLL . auto/have
have=NGX_HAVE_EPOLLRDHUP . auto/have
have=NGX_HAVE_EVENTFD . auto/have
have=NGX_TEST_BUILD_EPOLL . auto/have
EVENT_MODULES="$EVENT_MODULES $EPOLL_MODULE"

16
auto/os/linux
View File

@ -65,6 +65,22 @@ if [ $ngx_found = yes ]; then
CORE_SRCS="$CORE_SRCS $EPOLL_SRCS"
EVENT_MODULES="$EVENT_MODULES $EPOLL_MODULE"
EVENT_FOUND=YES
# EPOLLRDHUP appeared in Linux 2.6.17, glibc 2.8
ngx_feature="EPOLLRDHUP"
ngx_feature_name="NGX_HAVE_EPOLLRDHUP"
ngx_feature_run=no
ngx_feature_incs="#include <sys/epoll.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int efd = 0, fd = 0;
struct epoll_event ee;
ee.events = EPOLLIN|EPOLLRDHUP|EPOLLET;
ee.data.ptr = NULL;
epoll_ctl(efd, EPOLL_CTL_ADD, fd, &ee)"
. auto/feature
fi

18
src/event/modules/ngx_epoll_module.c
View File

@ -25,6 +25,8 @@
#define EPOLLERR 0x008
#define EPOLLHUP 0x010
#define EPOLLRDHUP 0x2000
#define EPOLLET 0x80000000
#define EPOLLONESHOT 0x40000000
@ -396,13 +398,13 @@ ngx_epoll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
if (event == NGX_READ_EVENT) {
e = c->write;
prev = EPOLLOUT;
#if (NGX_READ_EVENT != EPOLLIN)
events = EPOLLIN;
#if (NGX_READ_EVENT != EPOLLIN|EPOLLRDHUP)
events = EPOLLIN|EPOLLRDHUP;
#endif
} else {
e = c->read;
prev = EPOLLIN;
prev = EPOLLIN|EPOLLRDHUP;
#if (NGX_WRITE_EVENT != EPOLLOUT)
events = EPOLLOUT;
#endif
@ -466,7 +468,7 @@ ngx_epoll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
} else {
e = c->read;
prev = EPOLLIN;
prev = EPOLLIN|EPOLLRDHUP;
}
if (e->active) {
@ -501,7 +503,7 @@ ngx_epoll_add_connection(ngx_connection_t *c)
{
struct epoll_event ee;
ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
ee.events = EPOLLIN|EPOLLOUT|EPOLLET|EPOLLRDHUP;
ee.data.ptr = (void *) ((uintptr_t) c | c->read->instance);
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
@ -666,6 +668,12 @@ ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
if ((revents & EPOLLIN) && rev->active) {
#if (NGX_HAVE_EPOLLRDHUP)
if (revents & EPOLLRDHUP) {
rev->pending_eof = 1;
}
#endif
if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
rev->posted_ready = 1;

9
src/event/ngx_event.h
View File

@ -71,7 +71,7 @@ struct ngx_event_s {
unsigned deferred_accept:1;
/* the pending eof reported by kqueue or in aio chain operation */
/* the pending eof reported by kqueue, epoll or in aio chain operation */
unsigned pending_eof:1;
#if !(NGX_THREADS)
@ -349,6 +349,11 @@ extern ngx_event_actions_t ngx_event_actions;
#define NGX_VNODE_EVENT 0
#if (NGX_HAVE_EPOLL) && !(NGX_HAVE_EPOLLRDHUP)
#define EPOLLRDHUP 0
#endif
#if (NGX_HAVE_KQUEUE)
#define NGX_READ_EVENT EVFILT_READ
@ -392,7 +397,7 @@ extern ngx_event_actions_t ngx_event_actions;
#elif (NGX_HAVE_EPOLL)
#define NGX_READ_EVENT EPOLLIN
#define NGX_READ_EVENT (EPOLLIN|EPOLLRDHUP)
#define NGX_WRITE_EVENT EPOLLOUT
#define NGX_LEVEL_EVENT 0