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Events: improved error event handling for UDP sockets. Normally, the epoll module calls the read and write handlers depending on whether EPOLLIN and EPOLLOUT are reported by epoll_wait(). No error processing is done in the module, the handlers are expected to get an error when doing I/O. If an error event is reported without EPOLLIN and EPOLLOUT, the module set both EPOLLIN and EPOLLOUT to ensure the error event is handled at least in one active handler. This works well unless the error is delivered along with only one of EPOLLIN or EPOLLOUT, and the corresponding handler does not do any I/O. For example, it happened when getting EPOLLERR|EPOLLOUT from epoll_wait() upon receiving "ICMP port unreachable" while proxying UDP. As the write handler had nothing to send it was not able to detect and log an error, and did not switch to the next upstream. The fix is to unconditionally set EPOLLIN and EPOLLOUT in case of an error event. In the aforementioned case, this causes the read handler to be called which does recv() and detects an error. In addition to the epoll module, analogous changes were made in devpoll/eventport/poll.
author Dmitry Volyntsev <xeioex@nginx.com>
date Mon, 21 Nov 2016 16:03:42 +0300
parents 1cbd7f87c6ed
children 549b13cd793b
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $USE_PERL != NO ]; then

    cat << END                                                >> $NGX_MAKEFILE

install_perl_modules:
	cd $NGX_OBJS/src/http/modules/perl && \$(MAKE) install
END

    NGX_INSTALL_PERL_MODULES=install_perl_modules

fi


case ".$NGX_SBIN_PATH" in
    ./*)
    ;;

    *)
        NGX_SBIN_PATH=$NGX_PREFIX/$NGX_SBIN_PATH
    ;;
esac


case ".$NGX_MODULES_PATH" in
    ./*)
    ;;

    *)
        NGX_MODULES_PATH=$NGX_PREFIX/$NGX_MODULES_PATH
    ;;
esac

NGX_MODULES_PATH=`dirname $NGX_MODULES_PATH/.`


case ".$NGX_CONF_PATH" in
    ./*)
    ;;

    *)
        NGX_CONF_PATH=$NGX_PREFIX/$NGX_CONF_PATH
    ;;
esac


NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`


case ".$NGX_PID_PATH" in
    ./*)
    ;;

    *)
        NGX_PID_PATH=$NGX_PREFIX/$NGX_PID_PATH
    ;;
esac


case ".$NGX_ERROR_LOG_PATH" in
    ./* | .)
    ;;

    *)
        NGX_ERROR_LOG_PATH=$NGX_PREFIX/$NGX_ERROR_LOG_PATH
    ;;
esac


case ".$NGX_HTTP_LOG_PATH" in
    ./*)
    ;;

    *)
        NGX_HTTP_LOG_PATH=$NGX_PREFIX/$NGX_HTTP_LOG_PATH
    ;;
esac


if test -f man/nginx.8 ; then
    NGX_MAN=man/nginx.8
else
    NGX_MAN=docs/man/nginx.8
fi

if test -d html ; then
    NGX_HTML=html
else
    NGX_HTML=docs/html
fi

cat << END                                                    >> $NGX_MAKEFILE

manpage:	$NGX_OBJS/nginx.8

$NGX_OBJS/nginx.8:	$NGX_MAN $NGX_AUTO_CONFIG_H
	sed -e "s|%%PREFIX%%|$NGX_PREFIX|" \\
		-e "s|%%PID_PATH%%|$NGX_PID_PATH|" \\
		-e "s|%%CONF_PATH%%|$NGX_CONF_PATH|" \\
		-e "s|%%ERROR_LOG_PATH%%|${NGX_ERROR_LOG_PATH:-stderr}|" \\
		< $NGX_MAN > \$@

install:	build $NGX_INSTALL_PERL_MODULES
	test -d '\$(DESTDIR)$NGX_PREFIX' || mkdir -p '\$(DESTDIR)$NGX_PREFIX'

	test -d '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`'
	test ! -f '\$(DESTDIR)$NGX_SBIN_PATH' \\
		|| mv '\$(DESTDIR)$NGX_SBIN_PATH' \\
			'\$(DESTDIR)$NGX_SBIN_PATH.old'
	cp $NGX_OBJS/nginx '\$(DESTDIR)$NGX_SBIN_PATH'

	test -d '\$(DESTDIR)$NGX_CONF_PREFIX' \\
		|| mkdir -p '\$(DESTDIR)$NGX_CONF_PREFIX'

	cp conf/koi-win '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/koi-utf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/win-utf '\$(DESTDIR)$NGX_CONF_PREFIX'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types' \\
		|| cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params' \\
		|| cp conf/fastcgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf' \\
		|| cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params' \\
		|| cp conf/uwsgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/uwsgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params' \\
		|| cp conf/scgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/scgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PATH' \\
		|| cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PATH'
	cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PREFIX/nginx.conf.default'

	test -d '\$(DESTDIR)`dirname "$NGX_PID_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_PID_PATH"`'

	test -d '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`'

	test -d '\$(DESTDIR)$NGX_PREFIX/html' \\
		|| cp -R $NGX_HTML '\$(DESTDIR)$NGX_PREFIX'
END


if test -n "$NGX_ERROR_LOG_PATH"; then
    cat << END                                                >> $NGX_MAKEFILE

	test -d '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`'
END

fi


if test -n "$DYNAMIC_MODULES"; then
    cat << END                                                >> $NGX_MAKEFILE

	test -d '\$(DESTDIR)$NGX_MODULES_PATH' \\
		|| mkdir -p '\$(DESTDIR)$NGX_MODULES_PATH'
END

fi


for ngx_module in $DYNAMIC_MODULES
do
    ngx_module=$ngx_module$ngx_modext

    cat << END                                                >> $NGX_MAKEFILE

	test ! -f '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module' \\
		|| mv '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module' \\
			'\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module.old'
	cp $NGX_OBJS/$ngx_module '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module'
END

done


# create Makefile

cat << END >> Makefile

build:
	\$(MAKE) -f $NGX_MAKEFILE

install:
	\$(MAKE) -f $NGX_MAKEFILE install

modules:
	\$(MAKE) -f $NGX_MAKEFILE modules

upgrade:
	$NGX_SBIN_PATH -t

	kill -USR2 \`cat $NGX_PID_PATH\`
	sleep 1
	test -f $NGX_PID_PATH.oldbin

	kill -QUIT \`cat $NGX_PID_PATH.oldbin\`
END