view auto/summary @ 8018:5119c8150478

Fixed runtime handling of systems without EPOLLRDHUP support. In 7583:efd71d49bde0 (nginx 1.17.5) along with introduction of the ioctl(FIONREAD) support proper handling of systems without EPOLLRDHUP support in the kernel (but with EPOLLRDHUP in headers) was broken. Before the change, rev->available was never set to 0 unless ngx_use_epoll_rdhup was also set (that is, runtime test for EPOLLRDHUP introduced in 6536:f7849bfb6d21 succeeded). After the change, rev->available might reach 0 on systems without runtime EPOLLRDHUP support, stopping further reading in ngx_readv_chain() and ngx_unix_recv(). And, if EOF happened to be already reported along with the last event, it is not reported again by epoll_wait(), leading to connection hangs and timeouts on such systems. This affects Linux kernels before 2.6.17 if nginx was compiled with newer headers, and, more importantly, emulation layers, such as DigitalOcean's App Platform's / gVisor's epoll emulation layer. Fix is to explicitly check ngx_use_epoll_rdhup before the corresponding rev->pending_eof tests in ngx_readv_chain() and ngx_unix_recv().
author Marcus Ball <marcus.ball@live.com>
date Mon, 30 May 2022 02:38:07 +0300
parents 0b5f12d5c531
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo
echo "Configuration summary"


if [ $USE_THREADS = YES ]; then
    echo "  + using threads"
fi

if [ $USE_PCRE = DISABLED ]; then
    echo "  + PCRE library is disabled"

else
    case $PCRE in
        YES)   echo "  + using system $PCRE_LIBRARY library" ;;
        NONE)  echo "  + PCRE library is not used" ;;
        *)     echo "  + using $PCRE_LIBRARY library: $PCRE" ;;
    esac
fi

case $OPENSSL in
    YES)   echo "  + using system OpenSSL library" ;;
    NONE)  echo "  + OpenSSL library is not used" ;;
    *)     echo "  + using OpenSSL library: $OPENSSL" ;;
esac

case $ZLIB in
    YES)   echo "  + using system zlib library" ;;
    NONE)  echo "  + zlib library is not used" ;;
    *)     echo "  + using zlib library: $ZLIB" ;;
esac

case $NGX_LIBATOMIC in
    YES)   echo "  + using system libatomic_ops library" ;;
    NO)    ;; # not used
    *)     echo "  + using libatomic_ops library: $NGX_LIBATOMIC" ;;
esac

echo


cat << END
  nginx path prefix: "$NGX_PREFIX"
  nginx binary file: "$NGX_SBIN_PATH"
  nginx modules path: "$NGX_MODULES_PATH"
  nginx configuration prefix: "$NGX_CONF_PREFIX"
  nginx configuration file: "$NGX_CONF_PATH"
  nginx pid file: "$NGX_PID_PATH"
END

if test -n "$NGX_ERROR_LOG_PATH"; then
    echo "  nginx error log file: \"$NGX_ERROR_LOG_PATH\""
else
    echo "  nginx logs errors to stderr"
fi

cat << END
  nginx http access log file: "$NGX_HTTP_LOG_PATH"
  nginx http client request body temporary files: "$NGX_HTTP_CLIENT_TEMP_PATH"
END

if [ $HTTP_PROXY = YES ]; then
    echo "  nginx http proxy temporary files: \"$NGX_HTTP_PROXY_TEMP_PATH\""
fi

if [ $HTTP_FASTCGI = YES ]; then
    echo "  nginx http fastcgi temporary files: \"$NGX_HTTP_FASTCGI_TEMP_PATH\""
fi

if [ $HTTP_UWSGI = YES ]; then
    echo "  nginx http uwsgi temporary files: \"$NGX_HTTP_UWSGI_TEMP_PATH\""
fi

if [ $HTTP_SCGI = YES ]; then
    echo "  nginx http scgi temporary files: \"$NGX_HTTP_SCGI_TEMP_PATH\""
fi

echo "$NGX_POST_CONF_MSG"