EPOLLHUP          779 src/event/modules/ngx_epoll_module.c         if (revents & (EPOLLERR|EPOLLHUP)) {
EPOLLHUP          786 src/event/modules/ngx_epoll_module.c         if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
EPOLLHUP          793 src/event/modules/ngx_epoll_module.c         if ((revents & (EPOLLERR|EPOLLHUP))